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Full text of "City of Phoenix Fuel and Gas Code"

• 



CIIY OF PHOENIX AMENDMENfS 



Includes amendmants to: : 

2006 International Building Code*, 2006 Interna^onat Residential Code*^ 
2006 International Energy Conservation Code®^ 2006 International M^anlc^l C«d«^ 
2CK)6 Infernatfonat Fuel Gas Code* and 2006 International Code Council Performan^i^p^^ 







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INTERNATIONAL 
CODECOUNCIl 



City of Phoenix Amendments to 
2006 International Fuel Gas Code® 



TABLE OF CONTENTS 



CHAPTER 1 ADMINISTRATION IR 

Section 

101 General (IFGC) IR 

102 Reserved IR 

103 Reserved 2R 

104 Reserved 2R 

105 Reserved 3R 

106 Reserved 3R 

107 Reserved 5R 

108 Reserved 6R 

109 Reserved 6R 

CHAPTER 2 DEFINITIONS 9 

Section 

201 General (IFGC) 9 

202 General Definitions (IFGC) 9 

CHAPTER 3 GENERAL REGULATIONS 17R 

Section 

301 General (IFGC) 17R 

302 Structural Safety (IFGC) 18 

303 Appliance Location (IFGC) 18 

304 Combustion, Ventilation, and 

Dilution Air (IFGS) 19 

305 Installation (IFGC) 22 

306 Access and Service Space (IFGC) 23 

307 Condensate Disposal (IFGC) 24 

308 Clearance Reduction (IFGS) 24 

309 Electrical (IFGC) 27 

310 Electrical Bonding (IFGS) 27 

CHAPTER 4 GAS PIPING INSTALLATIONS .... 29 

Section 

401 General (IFGC) 29 

402 Pipe Sizing (IFGS) 29 

403 Piping Materials (IFGS) 64 

404 Piping System Installation (IFGC) 66 

405 Pipe Bends and Changes in 

Direction (IFGS) 68 

406 Inspection, Testing and Purging (IFGS) 68 

407 Piping Support (IFGC) 70R 

408 Drips and Sloped Piping (IFGC) 70R 

409 Shutoff Valves (IFGC) 70R 

2006 INTERNATIONAL FUEL GAS CODE® 



410 Flow Controls (IFGC) 71 

411 Appliance and Manufactured 

Home Connections (IFGC) 71 

412 Liquefied Petroleum Gas Motor Vehicle 

Fuel-dispensing Stations (IFGC) 72 

413 Compressed Natural Gas Motor Vehicle 

Fuel-dispensing Stations (IFGC) 73 

414 Supplemental and Standby 

Gas Supply (IFGC) 74 

415 Piping Support Intervals (IFGS) 74 

416 Overpressure Protection Devices 75 

CHAPTER 5 CHIMNEYS AND VENTS 77 

Section 

501 General (IFGC) 77 

502 Vents (IFGC) 78 

503 Venting of Appliances (IFGS) 79 

504 Sizing of Category I Appliance 

Venting Systems (IFGS) 88 

505 Direct- Vent, Integral Vent, Mechanical Vent and 

Ventilation/Exhaust Hood Venting (IFGC) . 105R 

506 Factory-built Chimneys (IFGC) 105R 

CHAPTER 6 SPECIFIC APPLIANCES 115 

Section 

601 General (IFGC) 115 

602 Decorative Appliances for Installation 

in Fireplaces (IFGC) 115 

603 Log Lighters (IFGC) 115 

604 Vented Gas Fireplaces 

(Decorative Appliances) (IFGC) 115 

605 Vented Gas Fireplace Heaters (IFGC) 115 

606 Incinerators and Crematories (IFGC) 115 

607 Commercial-Industrial Incinerators (IFGC) ... 115 

608 Vented Wall Furnaces (IFGC) 115 

609 Floor Furnaces (IFGC) 116 

610 Duct Furnaces (IFGC) 116 

61 1 Nonrecirculating Direct-fired Industrial 

Air Heaters (IFGC) 116 

612 Recirculating Direct-fired Industrial Air 

Heaters (IFGC) 117 

613 Clothes Dryers (IFGC) 117 

614 Clothes Dryer Exhaust (IFGC) 117 

615 Sauna Heaters (IFGC) 118 

viiR 



TABLE OF CONTENTS 



616 Engine and Gas Turbine-powered 

Equipment (IFGC) 119 

617 Pool and Spa Heaters (IFGC) 119 

618 Forced- air Warm-air Furnaces (IFGC) 119 

619 Conversion Burners (IFGC) 119 

620 Unit Heaters (IFGC) 120 

621 Unvented Room B'eaters (IFGC) 120 

622 Vented Room Heaters (IFGC) 120 

623 Cooking Appliances (IFGC) 120 

624 Water Heaters (IFGC) 121 

625 Refrigerators (IFGC) 121 

626 Gas-fired Toilets (IFGC) 121 

627 Air-conditioning Equipment (IFGC) 121 

628 Illuminating Appliances (IFGC) 122 

629 Small Ceramic Kilns (IFGC) 122 

630 Infrared Radiant Heaters (IFGC) 122 

631 Boilers (IFGC) 122 

632 Equipment Installed in Existing 

Unlisted Boilers (IFGC) 122 

633 Stationary Fuel-cell Power Plants (IFGC) 122 

634 Chimney Damper Opening 

Area (IFGS) 123 

635 Gaseous Hydrogen Systems 123 

CHAPTER 7 GASEOUS HYDROGEN 

SYSTEMS 125 

Section 

701 General (IFGC) 125 

702 General Definitions (IFGC) 125 

703 General Requirements (IFGC) 125 

704 Piping, Use and Handling (IFGC) 126R 

705 Testing of Hydrogen Piping Systems (IFGC) . . 127 

706 Location of Gaseous 

Hydrogen Systems (IFGC) 128 

707 Operation and Maintenance of Gaseous 

Hydrogen Systems (IFGC) 129 

708 Design of Liquefied Hydrogen Systems 

Associated With Hydrogen Vaporization 
Operations (IFGC) 129 

viiiR 



CHAPTER 8 REFERENCED STANDARDS 131 

APPENDIX A SIZING AND CAPACITIES OF 

GAS PIPING (IFGS) 135 

APPENDIX B SIZING OF VENTING SYSTEMS 
SERVING APPLIANCES 
EQUIPPED WITH DRAFT 
HOODS, CATEGORY I 
APPLIANCES, AND 
APPLIANCES LISTED 
FOR USE WITH TYPE B 
VENTS (IFGS) 147 

APPENDIX C EXIT TERMINALS OF 

MECHANICAL DRAFT AND 
DIRECT- VENT VENTING 
SYSTEMS (IFGS) 157 

APPENDIX D RECOMMENDED PROCEDURE 
FOR SAFETY INSPECTION OF 
AN EXISTING APPLIANCE 
INSTALLATION (IFGS) 159 

INDEX 161 



2006 INTERNATIONAL FUEL GAS CODE** 



CHAPTER 1 

ADMINISTRATION 



SECTION 101 (IFGC) 
GENERAL 

101.1 Title. These regulations shall be known as the Fuel Gas 
Code of [NAME OF JURISDICTION], hereinafter referred to as 
"this code." 

101.2 Scope. This code shall apply to the installation of fuel 
gas piping systems, fuel gas utilization equipment, gaseous 
hydrogen systems and related accessories in accordance with 
Sections 101.2.1 through 101.2.5. 

Exception: Detached one- and two-family dwellings and 
multiple single-family dwellings (townhouses) not more 
than three stories high with separate means of egress and 
their accessory structures shall comply with the Interna- 
tional Residential Code. 

101.2.1 Gaseous hydrogen systems. Gaseous hydrogen 
systems shall be regulated by Chapter 7. 

101.2.2 Piping systems. These regulations cover piping 
systems for natural gas with an operating pressure of 125 
pounds per square inch gauge (psig) (862 kPa gauge) or 
less, and for LP-gas with an operating pressure of 20 psig 
(140 kPa gauge) or less, except as provided in Section 
402.6. 1 . Coverage shall extend from the point of delivery to 
the outlet of the equipment shutoff valves. Piping systems 
requirements shall include design, materials, components, 
fabrication, assembly, installation, testing, inspection, oper- 
ation and maintenance. 

101.2.3 Gas utilization equipment. Requirements for gas 
utilization equipment and related accessories shall include 
installation, combustion and ventilation air and venting and 
connections to piping systems. 

101.2.4 Systems and equipment outside the scope. This 
code shall not apply to the following: 

1 . Portable LP-gas equipment of all types that is not 
connected to a fixed fuel piping system. 

2. Installation of farm equipment such as brooders, 
dehydrators, dryers and irrigation equipment. 

3. Raw material (feedstock) applications except for 
piping to special atmosphere generators. 

4. Oxygen-fuel gas cutting and welding systems. 

5. Industrial gas applications using gases such as acet- 
ylene and acetylenic compounds, hydrogen, ammo- 
nia, carbon monoxide, oxygen and nitrogen. 

6. Petroleum refineries, pipehne compressor or pump- 
ing stations, loading terminals, compounding plants, 
refinery tank farms and natural gas processing plants. 

7 . Integrated chemical plants or portions of such plants 
where flammable or combustible liquids or gases 
are produced by, or used in, chemical reactions. 

8. LP-gas installations at utility gas plants. 

9. Liquefied natural gas (LNG) installations. 



1 0. Fuel gas piping in power and atomic energy plants . 

1 1 . Proprietary items of equipment, apparatus or instru- 
ments such as gas-generating sets, compressors and 
calorimeters. 

12. LP-gas equipment for vaporization, gas mixing and 
gas manufacturing. 

13. Temporary LP-gas piping for buildings under con- 
struction or renovation that is not to become part of 
the permanent piping system. 

14. Installation of LP-gas systems for railroad switch 
heating. 

15. Installation of hydrogen gas, LP-gas and com- 
pressed natural gas (CNG) systems on vehicles. 

16. Except as provided in Section 401.1.1, gas piping, 
meters, gas pressure regulators and other appurte- 
nances used by the serving gas supplier in the distri- 
bution of gas, other than undiluted LP-gas. 

17. Building design and construction, except as speci- 
fied herein. 

1 8 . Piping systems for mixtures of gas and air within the 
flammable range with an operating pressure greater 
than 10 psig (69 kPa gauge). 

19. Portable fuel cell appliances that are neither con- 
nected to a fixed piping system nor interconnected 
to a power grid. 

101.2.5 Other fuels. The requirements for the design, 
installation, maintenance, alteration and inspection of 
mechanical systems operating with fuels other than fuel gas 
shall be regulated by the International Mechanical Code. 

101.3 Appendices. Provisions in the appendices shall not 
apply unless specifically adopted. 

101.4 Intent. The purpose of this code is to provide minimum 
standards to safeguard life or limb, health, property and public 
welfare by regulating and controlling the design, construction, 
installation, quality of materials, location, operation and main- 
tenance or use of fuel gas systems. 

101.5 Severability. If a section, subsection, sentence, clause or 
phrase of this code is, for any reason, held to be unconstitu- 
tional, such decision shall not affect the validity of the remain- 
ing portions of this code. 

101.6 Application. The requirements of the Phoenix Building 
Construction Code — Administrative Provisions shall apply to 
the International Fuel Gas Code. 



SECTION 102 (IFGC) 

APPLICABILITY 

Reserved 



2006 INTERNATIONAL FUEL GAS CODE® 



1R 



ADMINISTRATION 



SECTION 103 (IFGC) 
DEPARTMENT OF INSPECTION 
I I Reserved 



SECTION 104 (IFGC) 
DUTIES AND POWERS OF THE CODE OFFICIAL 
I I Reserved 



2R 2006 INTERNATIONAL FUEL GAS CODE*^ 



ADMINISTRATION 



SECTION 105 (IFGC) 

APPROVAL 

Reserved 



SECTION 106 (IFGC) 
PERMITS 
1 1 Reserved 



2006 INTERNATIONAL FUEL GAS CODE® 3R 



ADMINISTRATION 



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4R 2006 INTERNATIONAL FUEL GAS CODE*^ 



ADMINISTRATION 



SECTION 107 (IFGC) 

INSPECTIONS AND TESTING 

Reserved 



2006 INTERNATIONAL FUEL GAS CODE® 5R 



ADMINISTRATION 



SECTION 108 (IFGC) 
VIOLATIONS 
I I Reserved 



SECTION 109 (IFGC) 
MEANS OF APPEAL 
I I Reserved 



6R 2006 INTERNATIONAL FUEL GAS CODE*' 



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2006 INTERNATIONAL FUEL GAS CODE® 7R 



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8R 2006 INTERNATIONAL FUEL GAS CODE'^ 



CHAPTER 3 

GENERAL REGULATIONS 



^ 



SECTION 301 (IFGC) 
GENERAL 

301.1 Scope. This chapter shall govern the approval and instal- 
lation of all equipment and appliances that comprise parts of 
the installations regulated by this code in accordance with Sec- 
tion 101.2. 

301.1.1 Other fuels. The requirements for combustion 
and dilution air for gas-fired appliances shall be governed 
by Section 304. The requirements for combustion and 
dilution air for appliances operating with fuels other than 
fuel gas shall be regulated by the International Mechanical 
Code. 

301.2 Energy utilization. Heating, ventilating and air-condi- 
tioning systems of all structures shall be designed and installed 
for efficient utilization of energy in accordance with the Inter- 
national Energy Conservation Code. 

301.3 Listed and labeled. Appliances regulated by this code 
shall be listed and labeled for the application in which they are 
used unless otherwise approved in accordance with the Phoe- 
nix Building Construction Code — Administrative Provisions. 

301.4 Labeling. Labeling shall be in accordance with the pro- 
cedures set forth in Sections 301.4.1 through 301.4.2.3. 

301.4.1 Testing. An approved agency shall test a represen- 
tative sample of the appliances being labeled to the relevant 
standard or standards. The approved agency shall maintain a 
record of all of the tests performed. The record shall provide 
sufficient detail to verify compliance with the test standard. 

301.4.2 Inspection and identification. The approved 
agency shall periodically perform an inspection, which 
shall be in-plant if necessary, of the appliances to be labeled. 
The inspection shall verify that the labeled appliances are 
representative of the appliances tested. 

301.4.2.1 Independent. The agency to be approved shall 
be objective and competent. To confirm its objectivity, 
the agency shall disclose all possible conflicts of interest. 

301.4.2.2 Equipment. An approved agency shall have 
adequate equipment to perform all required tests. The 
equipment shall be periodically calibrated. 

301.4.2.3 Personnel. An approved agency shall employ 
experienced personnel educated in conducting, supervis- 
ing and evaluating tests. 

301.5 Label information. A permanent factory-applied name- 
plate(s) shall be affixed to appliances on which shall appear in 
legible lettering, the manufacturer's name or trademark, the 
model number, serial number and, for listed appliances, the 
seal or mark of the testing agency. A label shall also include the 
hourly rating in British thermal units per hour (Btu/h) (W); the 
type of fuel approved for use with the appliance; and the mini- 
mum clearance requirements. 



301.6 Plumbing connections. Potable water supply and build- 
ing drainage system connections to appliances regulated by 
this code shall be in accordance with the International Plumb- 
ing Code. 

301.7 Fuel types. Appliances shall be designed for use with the 
type of fuel gas that will be supplied to them. 

301.7.1 Appliance fuel conversion. Appliances shall not 
be converted to utilize a different fuel gas except where 
complete instructions for such conversion are provided in 
the installation instructions, by the serving gas supplier or 
by the appliance manufacturer. 

301.8 Vibration isolation. Where means for isolation of vibra- 
tion of an appliance is installed, an approved means for support 
and restraint of that appliance shall be provided. 

301.9 Repair. Defective material or parts shall be replaced or 
repaired in such a manner so as to preserve the original 
approval or listing. 

301.10 Wind resistance. Appliances and supports that are 
exposed to wind shall be designed and installed to resist the 
wind pressures determined in accordance with the Interna- 
tional Building Code. 

301.11 Flood hazard. For structures located in flood hazard 
areas, the appliance, equipment and system installations regu- 
lated by this code shall be located at or above the design flood 
elevation and shall comply with the flood-resistant construc- 
tion requirements of the International Building Code. 

Exception: The appliance, equipment and system installa- 
tions regulated by this code are permitted to be located 
below the design flood elevation provided that they are 
designed and installed to prevent water from entering or 
accumulating within the components and to resist hydro- 
static and hydrodynamic loads and stresses, including the 
effects of buoyancy, during the occurrence of flooding to the 
design flood elevation and shall comply with the 
flood-resistant construction requirements of the Interna- 
tional Building Code. 

301.12 Seismic resistance. When earthquake loads are appli- 
cable in accordance with the International Building Code, the 
supports shall be designed and installed for the seismic forces 
in accordance with that code. 

301.13 Ducts. All ducts required for the installation of systems 
regulated by this code shall be designed and installed in accor- 
dance with the International Mechanical Code. 

301.14 Rodentproofing. Buildings or structures and the walls 
enclosing habitable or occupiable rooms and spaces in which 
persons live, sleep or work, or in which feed, food or foodstuffs 
are stored, prepared, processed, served or sold, shall be con- 
structed to protect against rodents in accordance with the Inter- 
national Building Code. 



2006 INTERNATIONAL FUEL GAS CODE® 



17R 



GENERAL REGULATIONS 



301.15 Prohibited location. The appliances, equipment and 
systems regulated by this code shall not be located in an eleva- 
tor shaft. 



SECTION 302 (IFGC) 
STRUCTURAL SAFETY 

[B] 302.1 Structural safety. The building shall not be weak- 
ened by the installation of any gas piping. In the process of 
installing or repairing any gas piping, the finished floors, walls, 
ceilings, tile work or any other part of the building or premises 
which is required to be changed or replaced shall be left in a 
safe structural condition in accordance with the requirements 
of the International Building Code. 

[B] 302.2 Penetrations of floor/ceiling assemblies and 
fire-resistance-rated assemblies. Penetrations of floor/ceil- 
ing assemblies and assemblies required to have a fire-resis- 
tance rating shall be protected in accordance with the 
International Building Code. 

[B] 302.3 Cutting, notching and boring in wood members. 

The cutting, notching and boring of wood members shall com- 
ply with Sections 302.3.1 through 302.3.4. 

[B] 302.3.1 Engineered wood products. Cuts, notches and 
holes bored in trusses, structural composite lumber, struc- 
tural glued-laminated members and I-joists are prohibited 
except where permitted by the manufacturer's recommen- 
dations or where the effects of such alterations are specifi- 
cally considered in the design of the member by a registered 
design professional. 

[B] 302.3.2 Joist notching and boring. Notching at the 
ends of joists shall net exceed one-fourth the joist depth. 
Holes bored in joists shall not be within 2 inches (5 1 mm) of 
the top and bottom of the joist and their diameter shall not 
exceed one-third the depth of the member. Notches in the 
top or bottom of the joist shall not exceed one-sixth the 
depth and shall not be located in the middle one-third of the 
span. 

[B] 302.3.3 Stud cutting and notching. In exterior walls 
and bearing partitions, any wood stud is permitted to be cut 
or notched to a depth not exceeding 25 percent of its width. 
Cutting or notching of studs to a depth not greater than 40 
percent of the width of the stud is permitted in 
nonload-bearing partitions supporting no loads other than 
the weight of the partition. 

[B] 302.3.4 Bored holes. A hole not greater in diameter than 
40 percent of the stud depth is permitted to be bored in any 
wood stud. Bored holes not greater than 60 percent of the 
depth of the stud are permitted in nonload-bearing partitions 
or in any wall where each bored stud is doubled, provided 
not more than two such successive doubled studs are so 
bored. In no case shall the edge of the bored hole be nearer 
than Vg inch (15.9 mm) to the edge of the stud. Bored holes 
shall not be located at the same section of a stud as a cut or 
notch. 

[B] 302.4 Alterations to trusses. Truss members and compo- 
nents shall not be cut, drilled, notched, spliced or otherwise 
altered in any way without the written concurrence and 



approval of a registered design professional. Alterations 
resulting in the addition of loads to any member (e.g., HVAC 
equipment, water heaters) shall not be permitted without verifi- 
cation that the truss is capable of supporting such additional 
loading. 

[B] 302.5 Cutting, notching and boring holes in structural 
steel framing. The cutting, notching and boring of holes in 
structural steel framing members shall be as prescribed by the 
registered design professional. 

[B] 302.6 Cutting, notching and boring holes in 
cold-formed steel framing. Flanges and lips of load-bearing, 
cold-formed steel framing members shall not be cut or notched. 
Holes in webs of load-bearing, cold-formed steel framing 
members shall be permitted along the centerline of the web of 
the framing member and shall not exceed the dimensional limi- 
tations, penetration spacing or minimum hole edge distance as 
prescribed by the registered design professional. Cutting, 
notching and boring holes of steel floor/roof decking shall be 
as prescribed by the registered design professional. 

[B] 302.7 Cutting, notching and boring holes in 
nonstructural cold-formed steel wall framing. Ranges and 
lips of nonstructural cold-formed steel wall studs shall be per- 
mitted along the centerline of the web of the framing member, 
shall not exceed 1 72 inches (38 mm) in width or 4 inches (102 
nmi) in length, and the holes shall not be spaced less than 24 
inches (610 mm) center to center from another hole or less than 
10 inches (254 mm) from the bearing end. 



SECTION 303 (IFGC) 
APPLIANCE LOCATION 

303.1 General. Appliances shall be located as required by this 
section, specific requirements elsewhere in this code and the 
conditions of the equipment and appliance listing. 

303.2 Hazardous locations. Appliances shall not be located in 
a hazardous location unless listed and approved for the specific 
installation. 

303.3 Prohibited locations. Appliances shall not be located in 
sleeping rooms, bathrooms, toilet rooms, storage closets or sur- 
gical rooms, or in a space that opens only into such rooms or 
spaces, except where the installation complies with one of the 
following: 

1. The appliance is a direct- vent appliance installed in 
accordance with the conditions of the listing and the 
manufacturer's instructions. 

2. Vented room heaters, wall furnaces, vented decorative 
appliances, vented gas fireplaces, vented gas fireplace 
heaters and decorative appliances for installation in 
vented solid fuel-burning fireplaces are installed in 
rooms that meet the required volume criteria of Section 
304.5. 

3. A single wall-mounted unvented room heater is installed 
in a bathroom and such unvented room heater is 
equipped as specified in Section 621.6 and has an input 
rating not greater than 6,000 Btu/h (1.76 kW). The bath- 
room shall meet the required volume criteria of Section 
304.5. 



18 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 



underground, only, and shall conform to ASTM D 2513. Pipe 
shall be marked "Gas" and "ASTM D 2513." 



perature expansion or contraction, vibration, fatigue or the 
weight of the pipe and its contents. 



> 



403.6.1 Anodeless risers. Plastic pipe, tubing 
anodeless risers shall comply with the following: 



and 



1. Factory-assembled anodeless risers shall be recom- 
mended by the manufacturer for the gas used and shall 
be leak tested by the manufacturer in accordance with 
written procedures. 

2. Service head adapters and field-assembled anodeless 
risers incorporating service head adapters shall be 
reconmiended by the manufacturer for the gas used, 
and shall be designed and certified to meet the 
requirements of Category I of ASTM D 2513, and 
U.S. Department of Transportation, Code of Federal 
Regulations, Title 49, Part 192.281(e). The manufac- 
turer shall provide the user with qualified installation 
instructions as prescribed by the U.S. Department of 
Transportation, Code of Federal Regulations, Title 
49, Part 192.283(b). 

403.6.2 LP-gas systems. The use of plastic pipe, tubing and 
fittings in undiluted liquefied petroleum gas piping systems 
shall be in accordance with NFPA 58. 

403.7 Workmanship and defects. Pipe, tubing and fittings 
shall be clear and free from cutting burrs and defects in struc- 
ture or threading, and shall be thoroughly brushed, and chip 
and scale blown. 

Defects in pipe, tubing and fittings shall not be repaired. 
Defective pipe, tubing and fittings shall be replaced (see Sec- 
tion 406.1.2). 

403.8 Protective coating. Where in contact with material or 
atmosphere exerting a corrosive action, metallic piping and fit- 
tings coated with a corrosion-resistant material shall be used. 
External or internal coatings or linings used on piping or com- 
ponents shall not be considered as adding strength. 

403.9 Metallic pipe threads. Metallic pipe and fitting threads 
shall be taper pipe threads and shall comply with ASME B 1 .20. 1 . 

403.9.1 Damaged threads. Pipe with threads that are 
stripped, chipped, corroded or otherwise damaged shall not 
be used. Where a weld opens during the operation of cutting 
or threading, that portion of the pipe shall not be used. 

403.9.2 Number of threads. Field threading of metallic 
pipe shall be in accordance with Table 403.9.2. 

403.9.3 Thread compounds. Thread (joint) compounds 
(pipe dope) shall be resistant to the action of liquefied petro- 
leum gas or to any other chemical constituents of the gases 
to be conducted through the piping. 

403.10 Metallic piping joints and fittings. The type of piping 
joint used shall be suitable for the pressure-temperature condi- 
tions and shall be selected giving consideration to joint tight- 
ness and mechanical strength under the service conditions. The 
joint shall be able to sustain the maximum end force caused by 
the internal pressure and any additional forces caused by tem- 



TABLE 403.9.2 
SPECIFICATIONS FOR THREADING METALLIC PIPE 


IRON PIPE SIZE 
(inches) 


APPROXIMATE LENGTH OF 
THREADED PORTION (Inches) 


APPROXIMATE NUMBER 
OF THREADS TO BE CUT 


% 


% 


10 


% 


% 


10 


1 


% 


10 


IV4 


1 


11 


IV2 


1 


11 


2 


1 


11 


2V, 


IV, 


12 


3 


1V2 


12 


4 


1% 


13 



For SI: 1 inch = 25.4 mm. 

403.10.1 Pipe joints. Pipe joints shall be threaded, flanged, 
brazed or welded. Where nonferrous pipe is brazed, the 
brazing materials shall have a melting point in excess of 
1 ,000°F (538°C). Brazing alloys shall not contain more than 
0.05-percent phosphorus. 

403.10.2 Hibing joints. Tubing joints shall be either made 
with approved gas tubing fittings or brazed with a material 
having a melting point in excess of 1 ,000°F (538°C). Brazing 
alloys shall not contain more than 0.05-percentphosphorus. 

403.10.3 Flared joints. Flared joints shall be used only in 
systems constructed from nonferrous pipe and tubing where 
experience or tests have demonstrated that the joint is suit- 
able for the conditions and where provisions are made in the 
design to prevent separation of the joints. 

403.10.4 Metallic fittings. Metallic fittings shall comply 
with the following: 

1. Threaded fittings in sizes larger than 4 inches (102 
mm) shall not be used except where approved. 

2. Fittings used with steel or wrought-iron pipe shall be 
steel, brass, bronze, malleable iron or cast iron. 

3. Fittings used with copper or brass pipe shall be cop- 
per, brass or bronze. 

4. Fittings used with aluminum-alloy pipe shall be of 
aluminum alloy. 

5. Cast-iron fittings: 

5.1. Flanges shall be permitted. 

5.2. Bushings shall not be used. 

5.3. Fittings shall not be used in systems contain- 
ing flammable gas-air mixtures. 

5.4. Fittings in sizes 4 inches (102 mm) and larger 
shall not be used indoors except where ap- 
proved. 



2006 INTERNATIONAL FUEL GAS CODE*" 



65R 



GAS PIPING INSTALLATIONS 



5.5. Fittings in sizes 6 inches (152 mm) and larger 
shall not be used except where approved. 

6. Aluminum-alloy fittings. Threads shall not form the 
joint seal. 

7. Zinc aluminum-alloy fittings. Fittings shall not be 
used in systems containing flammable gas-air mix- 
tures. 

8. Special fittings. Fittings such as couplings, propri- 
etary-type joints, saddle tees, gland-type compres- 
sion fittings, and flared, flareless or 
compression-type tubing fittings shall be: used within 
the fitting manufacturer's pressure-temperature rec- 
onunendations; used within the service conditions 
anticipated with respect to vibration, fatigue, thermal 
expansion or contraction; installed or braced to pre- 
vent separation of the joint by gas pressure or external 
physical damage; and shall be approved. 

403.11 Plastic pipe, joints and fittings. Plastic pipe, tubing 
and fittings shall be joined in accordance with the manufactur- 
er's instructions. Such joint shall comply with the following: 

1 . The joint shall be designed and installed so that the longi- 
tudinal pull-out resistance of the joint will be at least 
equal to the tensile strength of the plastic piping material. 

2. Heat-fusion joints shall be made in accordance with 
qualified procedures that have been established and 
proven by test to produce gas-tight joints at least as 
strong as the pipe or tubing being joined. Joints shall be 
made with the joining method recommended by the pipe 
manufacturer. Heat fusion fittings shall be marked 
"ASTMD2513." 

3. Where compression-type mechanical joints are used, the 
gasket material in the fitting shall be compatible with the 
plastic piping and with the gas distributed by the system. 
An internal tubular rigid stiffener shall be used in con- 
junction with the fitting. The stiffener shall be flush with 
the end of the pipe or tubing and shall extend at least to 
the outside end of the compression fitting when installed. 
The stiffener shall be free of rough or sharp edges and 
shall not be a force fit in the plastic. Split tubular stiffen- 
ers shall not be used. 

4. Plastic piping joints and fittings for use in liquefied pe- 
troleum gas piping systems shall be in accordance with 
NFPA 58. 

403.12 Flanges. All flanges shall comply with ASME B16.1, 
ASME B 16.20 or MSS SP-6. The pressure-temperature ratings 
shall equal or exceed that required by the application. 

403.12.1 Flange facings. Standard facings shall be permit- 
ted for use under this code. Where 150-pound (1034 kPa) 
pressure-rated steel flanges are bolted to Class 125 cast-iron 
flanges, the raised face on the steel flange shall be removed. 

403.12.2 Lapped flanges. Lapped flanges shall be used 
only above ground or in exposed locations accessible for in- 
spection. 

403.13 Flange gaskets. Material for gaskets shall be capable of 
withstanding the design temperature and pressure of the piping 
system, and the chemical constituents of the gas being con- 



ducted, without change to its chemical and physical properties. 
The effects of fire exposure to the joint shall be considered in 
choosing material. Acceptable materials include metal or 
metal-jacketed asbestos (plain or corrugated), asbestos, and 
aluminum "O" rings and spiral wound metal gaskets. When a 
flanged joint is opened, the gasket shall be replaced. Full-face 
gaskets shall be used with all bronze and cast-iron flanges. 



SECTION 404 (IFGC) 
PIPING SYSTEM INSTALLATION 

404.1 Prohibited locations. Piping shall not be installed in or 
through a circulating air duct, clothes chute, chinmey or gas 
vent, ventilating duct, dumbwaiter or elevator shaft. Piping 
installed downstream of the point of delivery shall not extend 
through any townhouse unit other than the unit served by such 
piping. 

404.2 Piping in solid partitions and walls. Concealed piping 
shall not be located in solid partitions and solid walls, unless in- 
stalled in a chase or casing. 

404.3 Piping in concealed locations. Portions of a piping sys- 
tem installed in concealed locations shall not have unions, tub- 
ing fittings, right and left couplings, bushings, compression 
coupUngs and swing joints made by combinations of fittings. 

Exceptions: 

1 . Tubing joined by brazing. 

2. Fittings listed for use in concealed locations. 

404.4 Piping through foundation wall. Underground piping, 
where installed below grade through the outer foundation or 
basement wall of a building, shall be encased in a protective 
pipe sleeve. The annular space between the gas piping and the 
sleeve shall be sealed. 

404.5 Protection against physical damage. In concealed 
locations, where piping other than black or galvanized steel is 
installed through holes or notches in wood studs, joists, rafters 
or similar members less than 1 .5 inches (38 mm) from the near- I 
est edge of the member, the pipe shall be protected by shield 
plates. Shield plates shall be a minimum of Vi^-inch-thick (1.6 
mm) steel, shall cover the area of the pipe where the member is 
notched or bored and shall extend a minimum of 4 inches (102 
mm) above sole plates, below top plates and to each side of a 
stud, joist or rafter. 

404.6 Piping in solid floors. Piping in solid floors shall be laid 
in channels in the floor and covered in a manner that will allow 
access to the piping with a minimum amount of damage to the 
building. Where such piping is subject to exposure to excessive 
moisture or corrosive substances, the piping shall be protected 
in an approved manner. As an alternative to installation in chan- 
nels, the piping shall be installed in a conduit of Schedule 40 I 
steel, wrought iron, PVC or ABS pipe with tightly sealed ends 
and joints. Both ends of such conduit shall extend not less than | 
2 inches (51 mm) beyond the point where the pipe emerges 
from the floor. The conduit shall be vented above grade to the 
outdoors and shall be installed so as to prevent the entry of 
water and insects. 



66 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 



> 



404.7 Above-ground outdoor piping. All piping installed 
outdoors shall be elevated not less than SVj inches (152 mm) 
above ground and where installed across roof surfaces, shall be 
elevated not less than 3 V2 inches (152 mm) above the roof sur- 
face. Piping installed above ground, outdoors, and installed 
across the surface of roofs shall be securely supported and lo- 
cated where it will be protected from physical damage. Where 
passing through an outside wall, the piping shall also be pro- 
tected against corrosion by coating or wrapping with an inert 
material. Where piping is encased in a protective pipe sleeve, 
the annular space between the piping and the sleeve shall be 
sealed. 

404.8 Protection against corrosion. Metallic pipe or tubing 
exposed to corrosive action, such as soil condition or moisture, 
shall be protected in an approved manner. Zinc coatings (galva- 
nizing) shall not be deemed adequate protection for gas piping 
underground. Ferrous metal exposed in exterior locations shall 
be protected from corrosion in a manner satisfactory to the 
code official. Where dissimilar metals are joined underground, 
an insulating coupling or fitting shall be used. Piping shall not 
be laid in contact with cinders. 

404.8.1 Prohibited use. Uncoated threaded or socket 
welded joints shall not be used in piping in contact with soil 
or where internal or external crevice corrosion is known to 
occur. 

404.8.2 Protective coatings and wrapping. Pipe protec- 
tive coatings and wrappings shall be approved for the appli- 
cation and shall be factory applied. 

Exception: Where installed in accordance with the man- 
ufacturer's installation instructions, field application of 
coatings and wrappings shall be permitted for pipe nip- 
ples, fittings and locations where the factory coating or 
wrapping has been damaged or necessarily removed at 
joints. 

404.9 Minimum burial depth. Underground ferrous piping 
systems shall be installed a minimum depth of 12 inches (305 
mm) below grade. Underground plastic piping systems shall be 
installed a minimum depth of 1 8 inches (458 mm) below grade. 

404.10 Trenches. The trench shall be graded so that the pipe 
has a firm, substantially continuous bearing on the bottom of 
the trench. 

404.11 Piping underground beneath buildings. Piping 
installed underground beneath buildings is prohibited except 
where the piping is encased in a conduit of wrought iron, plastic 
pipe, or steel pipe designed to withstand the superimposed 
loads. Such conduit shall extend into an occupiable portion of 
the building and, at the point where the conduit terminates in 
the building, the space between the conduit and the gas piping 
shall be sealed to prevent the possible entrance of any gas leak- 
age. Where the end sealing is capable of withstanding the full 
pressure of the gas pipe, the conduit shall be designed for the 
same pressure as the pipe. Such conduit shall extend not less 
than 4 inches (102 mm) outside the building, shall be vented 
above grade to the outdoors, and shall be installed so as to pre- 
vent the entrance of water and insects. The conduit shall be pro- 
tected from corrosion in accordance with Section 404.8. 



404.12 Outlet closures. Gas outlets that do not connect to ap- 
pliances shall be capped gas tight. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.13 Location of outlets. The unthreaded portion of piping 
outlets shall extend not less than 1 inch (25 mm) through fin- 
ished ceilings and walls and where extending through floors or 
outdoor patios and slabs, shall not be less than 2 inches (5 1 
mm) above them. The outlet fitting or piping shall be securely 
supported. Outlets shall not be placed behind doors. Outlets 
shall be located in the room or space where the appliance is 
installed. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.14 Plastic pipe. The installation of plastic pipe shall com- 
ply with Sections 404.14.1 through 404.14.3. 

404.14.1 Limitations. Plastic pipe shall be installed outside 
underground only. Plastic pipe shall not be used within or 
under any building or slab or be operated at pressures 
greater than 100 psig (689 kPa) for natural gas or 30 psig 
(207 kPa) for LP-gas. 

Exceptions: 

1 . Plastic pipe shall be permitted to terminate above 
ground outside of buildings where installed in 
premanufactured anodeless risers or service head 
adapter risers that are installed in accordance with 
the manufacturer's installation instructions. 

2. Plastic pipe shall be permitted to terminate with a 
wall head adapter within buildings where the plas- 
tic pipe is inserted in a piping material for fuel gas 
use in buildings. 

404.14.2 Connections. Connections made outside and un- 
derground between metallic and plastic piping shall be 
made only with transition fittings categorized as Category I 
in accordance with ASTM D 2513. 

404.14.3 Tracer. A yellow insulated copper tracer wire or 
other approved conductor shall be installed adjacent to un- 
derground nonmetallic piping. Access shall be provided to 
the tracer wire or the tracer wire shall terminate above 
ground at each end of the nonmetallic piping. The tracer 
wire size shall not be less than 18 AWG and the insulation 
type shall be suitable for direct burial. 

404.15 Prohibited devices. A device shall not be placed inside 
the piping or fittings that will reduce the cross-sectional area or 
otherwise obstruct the free flow of gas. 

Exception: Approved gas filters. 

404.16 Testing of piping. Before any system of piping is put in 
service or concealed, it shall be tested to ensure that it is gas 



2006 INTERNATIONAL FUEL GAS CODE'' 



67R 



GAS PIPING INSTALLATIONS 



tight. Testing, inspection and purging of piping systems shall 
comply with Section 406. 



SECTION 405 (IFGS) 
PIPING BENDS AND CHANGES IN DIRECTION 

405.1 General. Changes in direction of pipe shall be permitted 
to be made by the use of fittings, factory bends, or field bends. 

405.2 Metallic pipe. Metallic pipe bends shall comply with the 
following: 

1 . Bends shall be made only with bending tools and proce- 
dures intended for that purpose. 

2. All bends shall be smooth and free from buckling, cracks 
or other evidence of mechanical damage. 

3. The longitudinal weld of the pipe shall be near the neu- 
tral axis of the bend. 

4. Pipe shall not be bent through an arc of more than 90 
degrees (1.6 rad). 

5 . The inside radius of a bend shall be not less than six times 
the outside diameter of the pipe. 

405.3 Plastic pipe. Plastic pipe bends shall comply with the 
following: 

1 . The pipe shall not be damaged and the internal diameter 
of the pipe shall not be effectively reduced. 

2. Joints shall not be located in pipe bends. 

3. The radius of the inner curve of such bends shall not be 
less than 25 times the inside diameter of the pipe. 

4. Where the piping manufacturer specifies the use of spe- 
cial bending tools or procedures, such tools or proce- 
dures shall be used. 

405.4 Elbows. Factory-made welding elbows or transverse 
segments cut therefrom shall have an arc length measured 
along the crotch at least 1 inch (25 mm) in pipe sizes 2 inches 
(5 1 mm) and larger. 

SECTION 406 (IFGS) 
INSPECTION, TESTING AND PURGING 

406.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to de- 
termine that the materials, design, fabrication, and installation 
practices comply with the requirements of this code. 

406.1.1 Inspections. Inspection shall consist of visual ex- 
amination, during or after manufacture, fabrication, assem- 
bly, or pressure tests as appropriate. Supplementary types of 
nondestructive inspection techniques, such as mag- 
netic-particle, radiographic, ultrasonic, etc., shall not be re- 
quired unless specifically listed herein or in the engineering 
design. 

406.1.2 Repairs and additions. In the event repairs or addi- 
tions are made after the pressure test, the affected piping 
shall be tested. 

Minor repairs and additions are not required to be pres- 
sure tested provided that the work is inspected and connec- 



tions are tested with a noncorrosive leak-detecting fluid or 
other approved leak-detecting methods. 

406.1.3 New branches. Where new branches are installed 
to new appliances, only the newly installed branches shall 
be required to be pressure tested. Connections between the 
new piping and the existing piping shall be tested with a 
noncorrosive leak-detecting fluid or other approved 
leak-detecting methods. 

406.1.4 Section testing. A piping system shall be permitted 
to be tested as a complete unit or in sections. Under no cir- 
cumstances shall a valve in a line be used as a bulkhead 
between gas in one section of the piping system and test 
medium in an adjacent section, unless two valves are installed 
in series with a valved "telltale" located between these valves. 
A valve shall not be subjected to the test pressure unless it can 
be determined that the valve, including the valve-closing 
mechanism, is designed to safely withstand the test pressure. 

406.1.5 Regulators and valve assemblies. Regulator and 
valve assemblies fabricated independently of the piping sys- 
tem in which they are to be installed shall be permitted to be 
tested with inert gas or air at the time of fabrication. 

406.2 Test medium. The test medium shall be air, nitrogen, 
carbon dioxide or an inert gas. Oxygen shall not be used. 

406.3 Test preparation. Pipe joints, including welds, shall be 
left exposed for examination during the test. 

Exception: Covered or concealed pipe end joints that have 
been previously tested in accordance with this code. 

406.3.1 Expansion joints. Expansion joints shall be pro- 
vided with temporary restraints, if required, for the addi- 
tional thrust load under test. 

406.3.2 Appliance and equipment isolation. Appliances 
and equipment that are not to be included in the test shall be 
either disconnected from the piping or isolated by blanks, 
blind flanges, or caps. Flanged Joints at which blinds are in- 
serted to blank off other equipment during the test shall not 
be required to be tested. 

406.3.3 Appliance and equipment disconnection. Where 
the piping system is connected to appliances or equipment 
designed for operating pressures of less than the test pressure, 
such appliances or equipment shall be isolated from the pip- 
ing system by disconnecting them and capping the ouriet(s). 

406.3.4 Valve isolation. Where the piping system is con- 
nected to appUances or equipment designed for operating 
pressures equal to or greater than the test pressure, such 
appliances or equipment shall be isolated from the piping 
system by closing the individual appliance or equipment 
shutoff valve(s). 

406.3.5 Testing precautions. All testing of piping systems 
shall be done with due regard for the safety of employees 
and the pubUc during the test. Bulkheads, anchorage, and 
bracing suitably designed to resist test pressures shall be in- 
stalled if necessary. Prior to testing, the interior of the pipe 
shall be cleared of all foreign material. 

406.4 Test pressure measurement. Test pressure shall be 
measured with a manometer or with a pressure-measuring 



68 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 



device designed and calibrated to read, record, or indicate a 
pressure loss caused by leakage during the pressure test period. 
The source of pressure shall be isolated before the pressure 
tests are made. Mechanical gauges used to measure test pres- 
sures shall have a range such that the highest end of the scale is 
not greater than five times the test pressure. 

406.4.1 Test pressure. The test pressure to be used shall be 
no less than IVj times the proposed maximum working 
pressure, but not less than 10 psig (67 kPa gauge), irrespec- 
tive of design pressure. Where the test pressure exceeds 125 
psig (862 kPa gauge), the test pressure shall not exceed a 
value that produces a hoop stress in the piping greater than 
50 percent of the specified minimum yield strength of the 
pipe- 
Exception: A manometer may be utilized for applying 
test pressures of no less than 3 psi (20 kPa) when testing 
an existing system. 

406.4.2 Test duration. Test duration shall be not less than 
V2 hour for each 500 cubic feet (14 m^) of pipe volume or 
fraction thereof. When testing a system having a volume 



less than 10 cubic feet (0.28 m^) or a system in a 
single-family dwelling, the test duration shall be not less 
than 10 minutes. The duration of the test shall not be re- 
quired to exceed 24 hours. 

406.4.3 Test gauges. Refer to Section 705.3.6. 

406.5 Detection of leaks and defects. The piping system shall 
withstand the test pressure specified without showing any evi- 
dence of leakage or other defects. 

Any reduction of test pressures as indicated by pressure 
gauges shall be deemed to indicate the presence of a leak unless 
such reduction can be readily attributed to some other cause. 

406.5.1 Detection methods. The leakage shall be located 
by means of an approved gas detector, a noncorrosive leak 
detection fluid, or other approved leak detection methods. 
Matches, candles, open flames, or other methods that could 
provide a source of ignition shall not be used. 

406.5.2 Corrections. Where leakage or other defects are lo- 
cated, the affected portion of the piping system shall be re- 
paired or replaced and retested. 



< 



2006 INTERNATIONAL FUEL GAS CODE<° 



69R 



GAS PIPING INSTALLATIONS 



SECTION 407 (IFGC) 
PIPING SUPPORT 

407.1 General. Piping shall be provided with support in accor- 
dance with Section 407.2. 

407.2 Design and installation. Piping shall be supported with 
pipe hooks, metal pipe straps, bands, brackets, or hangers suit- 
able for the size of piping, of adequate strength and quality, and 
located at intervals so as to prevent or damp out excessive vi- 
bration. Piping shall be anchored to prevent undue strains on 
connected equipment and shall not be supported by other pip- 
ing. Pipe hangers and supports shall conform to the require- 
ments of MSS SP-58 and shall be spaced in accordance with 
Section 415. Supports, hangers, and anchors shall be installed 
so as not to interfere with the free expansion and contraction of 
the piping between anchors. All parts of the supporting equip- 
ment shall be designed and installed so they will not be disen- 
gaged by movement of the supported piping. 



SECTION 408 (IFGC) 
DRIPS AND SLOPED PIPING 

408.1 Slopes. Piping for other than dry gas conditions shall be 
sloped not less than V4 inch in 15 feet (6.3 mm in 4572 mm) to 
prevent traps. 

408.2 Drips. Where wet gas exists, a drip shall be provided at 
any point in the line of pipe where condensate could collect. A 
drip shall also be provided at the outlet of the meter and shall be 
installed so as to constitute a trap wherein an accumulation of 
condensate will shut off the flow of gas before the condensate 
will run back into the meter. 

408.3 Location of drips. Drips shall be provided with ready 
access to permit cleaning or emptying. A drip shall not be lo- 
cated where the condensate is subject to freezing. 

408.4 Sediment trap. Where a sediment trap is not incorpo- 
rated as part of the gas utihzation equipment, a sediment trap 
shall be installed downstream of the equipment shutoff valve as 
close to the inlet of the equipment as practical. The sediment 
trap shall be either a tee fitting with a capped nipple in the bot- 
tom opening of the run of the tee or other device approved as an 



effective sediment trap. Illuminating appliances, ranges, 
clothes dryers and outdoor grills need not be so equipped. 



SECTION 409 (IFGC) 
SHUTOFF VALVES 

409.1 General. Piping systems shall be provided with shutoff 
valves in accordance with this section. 

409.1.1 Valve approval. Shutoff valves shall be of an 
approved type; shall be constructed of materials compatible 
with the piping; and shall comply with the standard that is 
applicable for the pressure and application, in accordance 
with Table 409.1.1. 

409.1.2 Prohibited locations. Shutoff valves shall be pro- 
hibited in concealed locations and furnace plenums. 

409.1.3 Access to shutoff valves. Shutoff valves shall be lo- 
cated in places so as to provide access for operation and 
shall be installed so as to be protected from damage. 

409.2 Meter valve. Every meter shall be equipped with a shut- 
off valve located on the supply side of the meter. 

409.3 Shutoff valves for multiple-house line systems. Where 
a single meter is used to supply gas to more than one building or 
tenant, a separate shutoff valve shall be provided for each 
building or tenant. 

409.3.1 Multiple tenant buildings. In multiple tenant 
buildings, where a common piping system is installed to 
supply other than one- and two-family dwellings, shutoff 
valves shall be provided for each tenant. Each tenant shall 
have access to the shutoff valve serving that tenant's space. 

409.3.2 Individual buildings. In a common system serving 
more than one building, shutoff valves shall be installed out- 
doors at each building. 

409.3.3 Identification of shutoff valves. Each house line 
shutoff valve shall be plainly marked with an identification 
tag attached by the installer so that the piping systems sup- 
plied by such valves are readily identified. 

409.4 MP Regulator valves. A listed shutoff valve shall be in- 
stalled immediately ahead of each MP regulator. 



TABLE 409.1.1 
MANUAL GAS VALVE STANDARDS 



VALVE STANDARDS 


APPLIANCE SHUTOFF 

VALVE APPLICATION UP TO 

V2 psig PRESSURE 


OTHER VALVE APPLICATIONS 


UP TO V2 psig 
PRESSURE 


UP TO 2 psig 
PRESSURE 


UP TO 5 psig 
PRESSURE 


UP TO 125 psig 
PRESSURE 


ANSI Z2 1.15 


X 


— 











CSA Requirement 3-88 


X 


X 


X^ 


x" 





ASMEB 16.44 


X 


X 


x^ 


X" 


— 


ASMEB 16.33 


X 


X 


X 


X 


X 



For SI: 1 pound per square irxh gauge = 6.895 kPa. 

a. If labeled 2G. 

b. If labeled 5G. 



70R 



2006 INTERNATIONAL FUEL GAS CODE^ 



CHIMNEYS AND VENTS 



10 FT 
OR LESS 



2FTMIN. 

L 



WALL OR 
PARAPET 



CHIMNEY 



"T 
3FT 
MIN 



CHIMNEY 





2 FT 


10 FT 








OR LESS 






MIN: 




1 1 




RIDGE 


^ 


V 


3 FT 
MIN. 


Y 


N 


1 1 


.^ 



A. TERMINATION 10 FT OR LESS FROM RIDGE, WALL, OH PARAPET 



WALL OR 
PARAPET 



NOTE: NO HEIGHT 

ABOVE PARAPET 

REQUIRED WHEN 

DISTANCE FROM WALLS 

OR PARAPET IS MORE CHIMNEY 

THAN 10 FT 



-lUH- 



3 FT 
MIN 




HEIGHT ABOVE 
ANY ROOF 
SURFACE WITHIN 
10 FT HORIZONTALLY 



3 FT 
MIN. 



CHIMNEY 



B. TERMINATION MORE THAN 10 FT FROM RIDGE, WALL, OR PARAPET 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE 503.5.4 

TYPICAL TERMINATION LOCATIONS FOR 

CHIMNEYS AND SINGLE-WALL METAL PIPES SERVING 

RESIDENTIAL-TYPE AND LOW-HEAT EQUIPMENT 



503.5.5 Size of chimneys. The effective area of a chimney 
venting system serving listed appliances with draft hoods, 
Category I appliances, and other appliances listed for use 
with Type B vents shall be determined in accordance with 
one of the following methods: 

1. The provisions of Section 504. 

2. For sizing an individual chimney venting system for a 
single appliance with a draft hood, the effective areas 
of the vent connector and chimney flue shall be not 
less than the area of the appliance flue collar or draft 
hood outlet, nor greater than seven times the draft 
hood outlet area. 

3. For sizing a chimney venting system connected to 
two appliances with draft hoods, the effective area of 
the chimney flue shall be not less than the area of the 
larger draft hood outlet plus 50 percent of the area of 
the smaller draft hood outlet, nor greater than seven 
times the smallest draft hood outlet area. 

4. Chimney venting systems using mechanical draft 
shall be sized in accordance with approved engineer- 
ing methods. 

5. Other approved engineering methods. 

503.5.5.1 Incinerator venting. Where an incinerator is 
vented by a chimney serving other appliances, the gas 
input to the incinerator shall not be included in calculat- 
ing chimney size, provided that the chimney flue diame- 
ter is not less than 1 inch (25 mm) larger in equivalent 
diameter than the diameter of the incinerator flue outlet. 

503.5.6 Inspection of chimneys. Before replacing an exist- 
ing appliance or connecting a vent connector to a chimney, 
the chimney passageway shall be examined to ascertain that 
it is clear and free of obstructions and it shall be cleaned if 
previously used for venting solid or liquid fuel-burning 
appliances or fireplaces. 

503.5.6.1 Chimney lining. Chimneys shall be lined in 
accordance with NFPA 211. 

Exception: Existing chimneys shall be permitted to 
have their use continued when an appliance is 
replaced by an appliance of similar type, input rating, 
and efficiency. 

503.5.6.2 Cleanouts. Cleanouts shall be examined to 
determine if they will remain tightly closed when not in 
use. 

503.5.6.3 Unsafe chimneys. Where inspection reveals 
that an existing chimney is not safe for the intended 
appHcation, it shall be repaired, rebuilt, lined, relined or 
replaced with a vent or chimney to conform to NFPA 2 1 1 
and it shall be suitable for the appliances to be vented. 

503.5.7 Chimneys serving equipment burning other 
fuels. Chimneys serving equipment burning other fuels 
shall comply with Sections 503.5.7.1 through 503.5.7.4. 

503.5.7.1 Solid fuel-burning appliances. An appliance 
shall not be connected to a chimney flue serving a sepa- 
rate appliance designed to bum solid fuel. 



2006 INTERNATIONAL FUEL GAS CODE*" 



81 



CHIMNEYS AND VENTS 



503.5.7.2 Liquid fuel-burning appliances. Where one 
chimney flue serves gas appliances and liquid fuel-burn- 
ing appUances, the appliances shall be connected through 
separate openings or shall be connected through a single 
opening where joined by a suitable fitting located as close 
as practical to the chimney. Where two or more openings 
are provided into one chimney flue, they shall be at differ- 
ent levels. Where the appliances are automatically con- 
trolled, they shall be equipped with safety shutoff devices. 

503.5.7.3 Combination gas and solid fuel-burning 
appliances. A combination gas- and solid fuel-burning 
appliance shall be permitted to be connected to a single 
chimney flue where equipped with a manual reset device 
to shut off gas to the main burner in the event of sustained 
backdraft or flue gas spillage. The chimney flue shall be 
sized to properly vent the appliance. 

503.5.7.4 Combination gas- and oil fuel-burning 
appliances. A listed combination gas- and oil fuel-burn- 
ing appliance shall be permitted to be connected to a sin- 
gle chimney flue. The chimney flue shall be sized to 
properly vent the appliance. 

503.5.8 Support of chimneys. All portions of chimneys 
shall be supported for the design and weight of the materials 
employed. Factory-built chimneys shall be supported and 
spaced in accordance with the manufacturer's installation 
instructions. 

503.5.9 Cleanouts. Where a chimney that formerly carried 
flue products from liquid or solid fuel-burning appliances is 
used with an appliance using fuel gas, an accessible 
cleanout shall be provided. The cleanout shall have a 
tight-fitting cover and shall be installed so its upper edge is 
at least 6 inches (152 mm) below the lower edge of the low- 
est chimney inlet opening. 

503.5.10 Space surrounding lining or vent. The remaining 
space surrounding a chimney liner, gas vent, special gas vent 
or plastic piping installed within a masonry chimney flue 
shall not be used to vent another apphance. The insertion of 
another liner or vent within the chimney as provided in this 
code and the liner or vent manufacturer's instructions shall 
not be prohibited. 

The remaining space surrounding a chimney liner, gas vent, 
special gas vent or plastic piping installed within a masonry, 
metal or factory-buUt chimney shall not be used to supply 
combustion air. Such space shall not be prohibited from sup- 
plying combustion air to direct-vent appliances designed for 
installation in a solid fuel-burning fireplace and installed in 
accordance with the manufacturer's installation instructions. 

503.6 Gas vents. Gas vents shall comply with Sections 503.6. 1 
through 503.6.12 (see Section 202, Definitions). 

503.6.1 Installation, general. Gas vents shall be installed in 
accordance with the manufacturer's installation instructions. 

503.6.2 Type B-W vent capacity. A Type B-W gas vent 
shall have a listed capacity not less than that of the listed 
vented wall furnace to which it is connected. 

503.6.3 Gas vents installed within masonry chimneys. 

Gas vents installed within masonry chimneys shall be 



installed in accordance with the manufacturer's installation I 
instructions. Gas vents installed within masonry chimneys 
shall be identified with a permanent label installed at the 
point where the vent enters the chimney. The label shall con- 
tain the following language: "This gas vent is for appliances 
that bum gas. Do not connect to solid or liquid fuel-burning 
appUances or incinerators." 

503.6.4 Gas vent terminations. A gas vent shall terminate 
in accordance with one of the following: 

1. Gas vents that are 12 inches (305 mm) or less in size 
and located not less than 8 feet (2438 mm) from a ver- 
tical wall or similar obstruction shall terminate above 
the roof in accordance with Figure 503.6.4. 

2. Gas vents that are over 12 inches (305 mm) in size or 
are located less than 8 feet (2438 mm) from a vertical 
wall or similar obstruction shall terminate not less 
than 2 feet (610 mm) above the highest point where 
they pass through the roof and not less than 2 feet (610 
mm) above any portion of a building within 10 feet 
(3048 mm) horizontally. 

3 . As provided for industrial appliances in Section 503.2.2. 

4. As provided for direct- vent systems in Section 503.2.3. 

5. As provided for appliances with integral vents in Sec- 
tion 503.2.4. 

6. As provided for mechanical draft systems in Section 
503.3.3. 

7. As provided for ventilating hoods and exhaust sys- 
tems in Section 503.3.4. 

8. No venting systems shall terminate less than 4 feet 
(1219 mm) from any property line except a public 
way. 

503.6.4.1 Decorative shrouds. Decorative shrouds shall 
not be installed at the termination of gas vents except 
where such shrouds are listed for use with the specific 
gas venting system and are installed in accordance with 
manufacturer's installation instructions. 

503.6.5 Minimum height. A Type B or L gas vent shall 
terminate at least 5 feet (1524 mm) in vertical height above 
the highest connected appliance draft hood or flue collar. A 
Type B-W gas vent shall terminate at least 12 feet (3658 
mm) in vertical height above the bottom of the wall fur- 
nace. 

503.6.6 Roof terminations. Gas vents shall extend through 
the roof flashing, roof jack or roof thimble and terminate 
with a listed cap or listed roof assembly. 

503.6.7 Forced air inlets. Gas vents shall terminate not less 
than 3 feet (914 mm) above any forced air inlet located 
within 10 feet (3048 mm). 

503.6.8 Exterior wall penetrations. A gas vent extending 
through an exterior wall shall not terminate adjacent to the 
wall or below eaves or parapets, except as provided in Sec- 
tions 503.2.3 and 503.3.3. 

503.6.9 Size of gas vents. Venting systems shall be sized 
and constructed in accordance with Section 504 or other 



82R 



2006 INTERNATIONAL FUEL GAS CODE'' 



CHIMNEYS AND VENTS 



TABLE 503.7.7^ 
CLEARANCES FOR CONNECTORS 



APPLtANCE 


MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL 


Listed Type B gas 
vent material 


Listed Type L 
vent material 


Single-wall 
metal pipe 


Factory-built 
chimney sections 


Listed appliances with draft hoods and appliances listed for 
use with Type B gas vents 


As listed 


As listed 


6 inches 


As listed 


Residential boilers and furnaces with listed gas conversion 
burner and with draft hood 


6 inches 


6 inches 


9 inches 


As listed 


Residential appliances listed for use with Type L vents 


Not permitted 


As listed 


9 inches 


As listed 


Listed gas-fired toilets 


Not permitted 


As listed 


As listed 


As listed 


Unlisted residential appliances with draft hood 


Not permitted 


6 inches 


9 inches 


As listed 


Residential and low-heat appliances other than above 


Not permitted 


9 inches 


18 inches 


As listed 


Medium-heat appliances 


Not permitted 


Not permitted 


36 inches 


As listed 



For SI: 1 inch = 25.4 mm. 

a. These clearances shall apply unless the manufacturer's installation instructions for a listed appliance or connector specify different clearances, in which case the 
listed clearances shall apply. 



503.8 Venting system termination location. The location of 
venting system terminations shall comply with the following 
(see Appendix C): 

L A mechanical draft venting system shall terminate at 
least 3 feet (914 mm) above any forced-air inlet located 
within 10 feet (3048 mm). 

Exceptions: 

1 . This provision shall not apply to the combus- 
tion air intake of a direct- vent appliance. 

2. This provision shall not apply to the separation 
of the integral outdoor air inlet and flue gas dis- 
charge of listed outdoor appliances. 

2. A mechanical draft venting system, excluding direct- vent 
appUances, shall terminate at least 4 feet (1219 mm) 
below, 4 feet (1219 nmi) horizontally from, or 1 foot (305 
nrni) above any door, operable window, or gravity air inlet 
into any building. The bottom of the vent terminal shall be 
located at least 12 inches (305 mm) above grade. 

3 . The vent terminal of a direct- vent appliance with an input 
of 10,000 Btu per hour (3 kW) or less shall be located at 
least 6 inches (152 mm) from any air opening into a 
building, and such an appliance with an input over 
10,000 Btu per hour (3 kW) but not over 50,000 Btu per 
hour (14.7 kW) shall be installed with a 9-inch (230 mm) 
vent termination clearance, and an appliance with an 
input over 50,000 Btu/h (14.7 kw) shall have at least a 
12-inch (305 mm) vent termination clearance. The bot- 
tom of the vent terminal and the air intake shall be located 
at least 12 inches (305 mm) above grade. 

4. Through-the-wall vents for Category II and IV apphances 
and noncategorized condensing apphances shall not ter- 
minate over pubhc walkways or over an area where con- 
densate or vapor could create a nuisance or hazard or 
could be detrimental to the operation of regulators, rehef 
valves, or other equipment. Where local experience indi- 
cates that condensate is a problem with Category I and III 
appliances, this provision shall also apply. 



5. No venting systems shall terminate less than 4 feet (1219 
mm) from any property line except a public way. 

503.9 Condensation drainage. Provisions shall be made to 
collect and dispose of condensate from venting systems serv- 
ing Category II and IV appliances and noncategorized con- 
densing appliances in accordance with Section 503.8, Item 4. 
Where local experience indicates that condensation is a prob- 
lem, provision shall be made to drain off and dispose of con- 
densate from venting systems serving Category I and III 
appliances in accordance with Sedtion 503.8, Item 4. 

503.10 Vent connectors for Category I equipment. Vent con- 
nectors for Category I equipment shall comply with Sections 
503.10.1 through 503.10.16. 

503.10.1 Wliere required. A vent connector shall be used to 
connect an appliance to a gas vent, chimney or single-wall 
metal pipe, except where the gas vent, chimney or single- wall 
metal pipe is directly connected to the appliance. 

503.10.2 Materials. Vent connectors shall be constructed in 
accordance with Sections 503.10.2.1 through 503.10.2.5. 

503.10.2.1 General. A vent connector shall be made of 
noncombustible corrosion-resistant material capable of 
withstanding the vent gas temperature produced by the 
apphance and of sufficient thickness to withstand physi- 
cal damage. 

503.10.2.2 Vent connectors located in unconditioned 
areas. Where the vent connector used for an appliance 
having a draft hood or a Category I appliance is located in 
or passes through attics, crawl spaces or other uncondi- 
tioned spaces, that portion of the vent connector shall be 
listed Type B, Type L or listed vent material having 
equivalent insulation properties. 

Exception: Single-wall metal pipe located within the 
exterior walls of the building in areas having a local 
99-percent winter design temperature of 5°F (-15°C) 
or higher shall be permitted to be used in uncondi- 
tioned spaces other than attics and crawl spaces. 



2006 INTERNATIONAL FUEL GAS CODE® 



85R 



CHIMNEYS AND VENTS 



503.10.2.3 Residential-type appliance connectors. 

Where vent connectors for residential-type appliances 
are not installed in attics or other unconditioned spaces, 
connectors for listed appliances having draft hoods, 
appliances having draft hoods and equipped with listed 
conversion burners and Category I appliances shall be 
one of the following: 

1 . Type B or L vent material; 

2. Galvanized sheet steel not less than 0.018 inch 
(0.46 mm) thick; 

3. Aluminum (1100 or 3003 alloy or equivalent) 
sheet not less than 0.027 inch (0.69 mm) thick; 

4. Stainless steel sheet not less than 0.012 inch (0.31 
mm) thick; 

5. Smooth interior wall metal pipe having resistance 
to heat and corrosion equal to or greater than that 
of Item 2, 3 or 4 above; or 

6. A listed vent connector. 

Vent connectors shall not be covered with insulation. 

Exception: Listed insulated vent connectors shall be 
installed according to the terms of their listing. 

503.10.2.4 Low-heat equipment. A vent connector for 
a nonresidential, low-heat appliance shall be a fac- 
tory-built chimney section or steel pipe having resistance 
to heat and corrosion equivalent to that for the appropri- 
ate galvanized pipe as specified in Table 503. 10.2.4. Fac- 
tory-built chimney sections shall be joined together in 
accordance with the chimney manufacturer's instruc- 
tions. 

TABLE 503.10.2.4 

MINIMUM THICKNESS FOR GALVANIZED STEEL VENT 

CONNECTORS FOR LOW-HEAT APPLIANCES 



DIAMETER OF CONNECTOR 
(inches) 


MINIMUM THICKNESS 
(inch) 


Less than 6 


0.019 


6 to less than 10 


0.023 


10 to 12 inclusive 


0.029 


14 to 16 inclusive 


0.034 


Over 16 


0.056 



For SI: 1 inch = 25.4 mm. 

503.10.2.5 Medium-heat appliances. Vent connectors 
for medium-heat appliances and commercial and indus- 
trial incinerators shall be constructed of factory-built 
medium-heat chimney sections or steel of a thickness not 
less than that specified in Table 503.10.2.5 and shall 
comply with the following: 

1 . A steel vent connector for an appliance with a vent 
gas temperature in excess of 1,000°F (538°C) 
measured at the entrance to the connector shall be 
lined with medium-duty fire brick (ASTM C 64, 
Type F), or the equivalent. 

2. The lining shall be at least 2V2 inches (64 mm) 
thick for a vent connector having a diameter or 



greatest cross-sectional dimension of 18 inches 
(457 mm) or less. 

3. The lining shall be at least 4V2 inches (114 mm) 
thick laid on the 4V2-inch (114 mm) bed for a vent 
connector having a diameter or greatest cross-sec- 
tional dimension greater than 1 8 inches (457 mm). 

4. Factory-built chimney sections, if employed, shall 
be joined together in accordance with the chimney 
manufacturer's instructions. 

TABLE 503.10.2.5 

MINIMUM THICKNESS FOR STEEL VENT CONNECTORS FOR 

MEDIUM-HEAT APPLIANCES AND COMMERCIAL AND 

INDUSTRIAL INCINERATORS VENT CONNECTOR SIZE 



DIAMETER 
(inches) 


AREA 
(square inches) 


MINIMUM THICKNESS 
(inch) 


Up to 14 


Up to 154 


0.053 


Over 14 to 16 


154 to 201 


0.067 


Over 16 to 18 


201 to 254 


0.093 


Over 18 


Larger than 254 


0.123 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm?. 

503.10.3 Size of vent connector. Vent connectors shall be 
sized in accordance with Sections 503.10.3.1 through 
503.10.3.5. 

503.10.3.1 Single draft hood and fan-assisted. A vent 
connector for an appliance with a single draft hood or for 
a Category I fan-assisted combustion system appliance 
shall be sized and installed in accordance with Section 
504 or other approved engineering methods. 

503.10.3.2 Multiple draft hood. For a single appliance 
having more than one draft hood outlet or flue collar, the 
manifold shall be constructed according to the instruc- 
tions of the appliance manufacturer. Where there are no 
instructions, the manifold shall be designed and con- 
structed in accordance with approved engineering prac- 
tices. As an alternate method, the effective area of the 
manifold shall equal the combined area of the flue collars 
or draft hood outlets and the vent connectors shall have a 
minimum 1-foot (305 mm) rise. 

503.10.3.3 Multiple appliances. Where two or more ap- 
pliances are connected to a common vent or chimney, 
each vent connector shall be sized in accordance with 
Section 504 or other approved engineering methods. 

As an alternative method applicable only when all of 
the appliances are draft hood equipped, each vent con- 
nector shall have an effective area not less than the area pf 
the draft hood outlet of the appliance to which it is con- 
nected. 

503.10.3.4 Common connector/manifold. Where two 
or more appliances are vented through a common vent 
connector or vent manifold, the common vent connector 
or vent manifold shall be located at the highest level con- 
sistent with available headroom and the required clear- 
ance to combustible materials and shall be sized in 
accordance with Section 504 or other approved engi- 
neering methods. 



86 



2006 INTERNATIONAL FUEL GAS CODE® 



CHIMNEYS AND VENTS 



504.3.23 Draft hood conversion accessories. Draft hood 
conversion accessories for use with masonry chimneys 
venting Usted Category I fan-assisted appliances shall be 
listed and installed in accordance with the manufacturer's 
installation instructions for such listed accessories. 

504.3.24 Multiple sizes permitted. Where a table permits 
more than one diameter of pipe to be used for a connector or 
vent, all the permitted sizes shall be permitted to be used. 

504.3.25 Table interpolation. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between table entries (see Appendix B, Example 3). 

504.3.26 Extrapolation prohibited. Extrapolation beyond 
the table entries shall not be permitted. 

504.3.27 Engineering calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent capaci- 
ties. 

SECTION 505 (IFGC) 

DIRECT-VENT, INTEGRAL VENT, 

MECHANICAL VENT AND 

VENTILATION/EXHAUST HOOD VENTING 

505.1 General. The installation of direct- vent and integral vent 
appliances shall be in accordance with Section 503. Mechani- 
cal venting systems and exhaust hood venting systems shall be 
designed and installed in accordance with Section 503. 

505.1.1 Commercial cooking appliances vented by 
exhaust hoods. Where commercial cooking appliances are 
vented by means of the Type I or II kitchen exhaust hood 
system that serves such appliances, the exhaust system shall 
be fan powered and the appliances shall be interlocked with 
the exhaust hood system to prevent appliance operation 
when the exhaust hood system is not operating. Where a 
solenoid valve is installed in the gas piping as part of an 
interlock system, gas piping shall not be installed to bypass 
such valve. Dampers shall not be installed in the exhaust 
system. 

SECTION 506 (IFGC) 
FACTORY-BUILT CHIMNEYS 

506.1 Building heating appliances. Factory-built chimneys 
for building heating appliances producing flue gases having a 
temperature not greater than 1,000°F (538°C), measured at the 
entrance to the chimney, shall be listed and labeled in accor- 
dance with UL 103 and shall be installed and terminated in ac- 
cordance with the manufacturer's installation instructions. 

506.2 Support. Where factory-built chimneys are supported 
by structural members, such as joists and rafters, such members 
shall be designed to support the additional load. 

506.3 Medium-heat appliances. Factory-built chimneys for 
medium-heat appliances producing flue gases having a temper- 
ature above 1,000°F (538°C), measured at the entrance to the 
chimney, shall be listed and labeled in accordance with UL 959 
and shall be installed and terminated in accordance with the 
manufacturer's installation instructions. 

2006 INTERNATIONAL FUEL GAS CODE® 1 05R 



CHIMNEYS AND VENTS 



TABLE 504.3(1) 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 
RISE 

(«) 
(feet) 


TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER— (P) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Mfn 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


Mln 


Max 


Max 


6 


1 


22 


37 


26 


35 


66 


46 


46 


106 


72 


58 


164 


104 


77 


225 


142 


92 


296 


185 


109 


376 


237 


128 


466 


289 


2 


23 


41 


31 


37 


75 


55 


48 


121 


86 


60 


183 


124 


79 


253 


168 


95 


333 


220 


112 


424 


282 


131 


526 


345 


3 


24 


44 


35 


38 


81 


62 


49 


132 


96 


62 


199 


139 


82 


275 


189 


97 


363 


248 


114 


463 


317 


134 


575 


386 


8 


1 


22 


40 


27 


35 


72 


48 


49 


114 


76 


64 


176 


109 


84 


243 


148 


100 


320 


194 


118 


408 


248 


138 


507 


303 


2 


23 


44 


32 


36 


80 


57 


51 


128 


90 


66 


195 


129 


86 


269 


175 


103 


356 


230 


121 


454 


294 


141 


564 


358 


3 


24 


47 


36 


37 


87 


64 


53 


139 


101 


67 


210 


145 


88 


290 


198 


105 


384 


258 


123 


492 


330 


143 


612 


402 


10 


1 


22 


43 


28 


34 


78 


50 


49 


123 


78 


65 


189 


113 


89 


257 


154 


106 


341 


200 


125 


436 


257 


146 


542 


314 


2 


23 


47 


33 


36 


86 


59 


51 


136 


93 


67 


206 


134 


91 


282 


182 


109 


374 


238 


128 


479 


305 


149 


596 


372 


3 


24 


50 


37 


37 


92 


67 


52 


146 


104 


69 


220 


150 


94 


303 


205 


111 


402 


268 


131 


515 


342 


152 


642 


417 


15 


1 


21 


50 


30 


33 


89 


53 


47 


142 


83 


64 


220 


120 


88 


298 


163 


110 


389 


214 


134 


493 


273 


162 


609 


333 


2 


22 


53 


35 


35 


96 


63 


49 


153 


99 


66 


235 


142 


91 


320 


193 


112 


419 


253 


137 


532 


323 


165 


658 


394 


3 


24 


55 


40 


36 


102 


71 


51 


163 


111 


68 


248 


160 


93 


339 


218 


115 


445 


286 


140 


565 


365 


167 


700 


444 


20 


1 


21 


54 


31 


33 


99 


56 


46 


157 


87 


62 


246 


125 


86 


334 


171 


107 


436 


224 


131 


552 


285 


158 


681 


347 


2 


22 


57 


37 


34 


105 


66 


48 


167 


104 


64 


259 


149 


89 


354 


202 


110 


463 


265 


134 


587 


339 


161 


725 


414 


3 


23 


60 


42 


35 


110 


74 


50 


176 


116 


66 


271 


168 


91 


371 


228 


113 


486 


300 


137 


618 


383 


164 


764 


466 


30 


1 


20 


62 


33 


31 


113 


59 


45 


181 


93 


60 


288 


134 


83 


391 


182 


103 


512 


238 


125 


649 


305 


151 


802 


372 


2 


21 


64 


39 


33 


118 


70 


47 


190 


110 


62 


299 


158 


85 


408 


215 


105 


535 


282 


129 


679 


360 


155 


840 


439 


3 


22 


66 


44 


34 


123 


79 


48 


198 


124 


64 


309 


178 


88 


423 


242 


108 


555 


317 


132 


706 


405 


158 


874 


494 


50 


1 


19 


71 


36 


30 


133 


64 


43 


216 


101 


57 


349 


145 


78 


477 


197 


97 


627 


257 


120 


797 


330 


144 


984 


403 


2 


21 


73 


43 


32 


137 


76 


45 


223 


119 


59 


358 


172 


81 


490 


234 


100 


645 


306 


123 


820 


392 


148 


1,014 


478 


3 


22 


75 


48 


33 


141 


86 


46 


229 


134 


61 


366 


194 


83 


502 


263 


103 


661 


343 


126 


842 


441 


151 


1,043 


538 


100 


1 


18 


82 


37 


28 


158 


66 


40 


262 


104 


53 


442 


150 


73 


611 


204 


91 


810 


266 


112 


1,038 


341 


135 


1,285 


417 


2 


19 


83 


44 


30 


161 


79 


42 


267 


123 


55 


447 


178 


75 


619 


242 


94 


822 


316 


115 


1,054 


405 


139 


1,306 


494 


3 


20 


84 


50 


31 


163 


89 


44 


272 


138 


57 


452 


109 


78 


627 


272 


97 


834 


355 


118 


1,069 


455 


142 


1,327 


555 



COMMON VENT CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER (C)— Inches 


4 


5 


6 


7 


8 


9 


10 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
■t-FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
-t-FAN 


FAN 
-^NAT 


NAT 
-^NAT 


FAN 
-frFAN 


FAN 
-t-NAT 


NAT 
-i-NAT 


FAN 
-i-FAN 


FAN 
-fNAT 


NAT 
■t-NAT 


FAN 
-t-FAN 


FAN 
-t-NAT 


NAT 
-t-NAT 


FAN 
-t-FAN 


FAN 
+NAT 


NAT 
-t-NAT 


6 


92 


81 


65 


140 


116 


103 


204 


161 


147 


309 


248 


200 


404 


314 


260 


547 


434 


335 


672 


520 


410 


8 


101 


90 


73 


155 


129 


114 


224 


178 


163 


339 


275 


223 


444 


348 


290 


602 


480 


378 


740 


577 


465 


10 


110 


97 


79 


169 


141 


124 


243 


194 


178 


387 


299 


242 


477 


377 


315 


649 


522 


405 


800 


627 


495 


15 


125 


112 


91 


195 


164 


144 


283 


228 


206 


427 


352 


280 


556 


444 


365 


753 


612 


465 


924 


733 


565 


20 


136 


123 


102 


215 


183 


160 


314 


255 


229 


475 


394 


310 


621 


499 


405 


842 


688 


523 


1,035 


826 


640 


30 


152 


138 


118 


244 


210 


185 


361 


297 


266 


547 


459 


360 


720 


585 


470 


979 


808 


605 


1,209 


975 


740 


50 


167 


153 


134 


279 


244 


214 


421 


353 


310 


641 


547 


423 


854 


706 


550 


1,164 


977 


705 


1,451 


1,188 


860 


100 


175 


163 


NA 


311 


277 


NA 


489 


421 


NA 


751 


658 


479 


1,025 


873 


625 


1,408 


1,215 


800 


1,784 


1,502 


975 



(continued) 



106 



2006 INTERNATIONAL FUEL GAS CODE*" 



CHAPTER 7 

GASEOUS HYDROGEN SYSTEMS 



SECTION 701 (IFGC) 
GENERAL 

701.1 Scope. The installation of gaseous hydrogen systems 
shall comply with this chapter and Chapters 30 and 35 of the 
International Fire Code. Compressed gases shall also comply 
with Chapter 27 of the International Fire Code for general 
requirements. 

701.2 Permits. Permits shall be required as set forth in Section 
106 and as required by the International Fire Code, 



SECTION 702 (IFGC) 
GENERAL DEFINITIONS 

702.1 Definitions. The following words and terms shall, for the 
purposes of this chapter and as used elsewhere in this code, 
have the meanings shown herein. 

HYDROGEN CUTOFF ROOM. A room or space which is 
intended exclusively to house a gaseous hydrogen system. 

HYDROGEN-GENERATING APPLIANCE. A self-con- 
tained package or factory-matched packages of integrated sys- 
tems for generating gaseous hydrogen. Hydrogen-generating 
appliances utilize electrolysis, reformation, chemical or other 
processes to generate hydrogen. 

GASEOUS HYDROGEN SYSTEM. An assembly of piping, 
devices and apparatus designed to generate, store, contain, dis- 
tribute or transport a nontoxic, gaseous hydrogen containing 
mixture having at least 95 -percent hydrogen gas by volume and 
not more than 1 -percent oxygen by volume. Gaseous hydrogen 
systems consist of items such as compressed gas containers, 
reactors and appurtenances, including pressure regulators, 
pressure relief devices, manifolds, pumps, compressors and 
interconnecting piping and tubing and controls. 



SECTION 703 (IFGC) 
GENERAL REQUIREMENTS 

703.1 Hydrogen-generating and refueling operations. Ven- 
tilation shall be required in accordance with Section 703.1.1, 
703.1.2 or 703.1.3 in public garages, private garages, repair 
garages, automotive motor fuel-dispensing facihties and park- 
ing garages that contain hydrogen-generating appliances or 
refueling systems. For the purpose of this section, rooms or 
spaces that are not part of the living space of a dwelling unit and 
that communicate directly with a private garage through open- 
ings shall be considered to be part of the private garage. 

703.1.1 Natural ventilation. Indoor locations intended for 
hydrogen-generating or refueling operations shall be lim- 
ited to a maximum floor area of 850 square feet (79 m^) and 
shall communicate with the outdoors in accordance with 
Sections 703. 1.1.1 and 703. 1 . 1 .2. The maximum rated out- 
put capacity of hydrogen generating appliances shall not 
exceed 4 standard cubic feet per minute (0.00189 mVs) of 



hydrogen for each 250 square feet (23.2 m^) of floor area in 
such spaces. The minimum cross-sectional dimension of air 
openings shall be 3 inches (76 mm). Where ducts are used, 
they shall be of the same cross-sectional area as the free area 
of the openings to which they connect. In such locations, 
equipment and appliances having an ignition source shall be 
located such that the source of ignition is not within 12 
inches (305 mm) of the ceiling. 

703.1.1.1 Two openings. Two permanent openings shall 
be provided within the garage. The upper opening shall 
be located entirely within 12 inches (305 mm) of the ceil- 
ing of the garage. The lower opening shall be located 
entirely within 12 inches (305 mm) of the floor of the 
garage. Both openings shall be provided in the same 
exterior wall. The openings shall communicate directly 
with the outdoors and shall have a minimum free area of 
V2 square foot per 1,000 cubic feet (1 mV610 m^) of 
garage volume. 

703.1.1.2 Louvers and grilles. In calculating the free 
area required by Section 703.1.1.1, the required size of 
openings shall be based on the net free area of each open- 
ing. If the free area through a design of louver or grille is 
known, it shall be used in calculating the size opening 
required to provide the free area specified. If the design 
and free area are not known, it shall be assumed that 
wood louvers will have 25 -percent free area and metal 
louvers and grilles will have 75-percent free area. Lou- 
vers and grilles shall be fixed in the open position. 

703.1.2 Mechanical ventilation. Indoor locations intended 
for hydrogen-generating or refueling operations shall be 
ventilated in accordance with Section 502. 16 of the Interna- 
tional Mechanical Code. In such locations, equipment and 
appliances having an ignition source shall be located such 
that the source of ignition is below the mechanical ventila- 
tion outlet(s). 

703.1.3 Specially engineered installations. As an alterna- 
tive to the provisions of Section 703.1.1 and 703.1.2, the 
necessary supply of air for ventilation and dilution of flam- 
mable gases shall be provided by an approved engineered 

system. 

[F] 703.2 Containers, cylinders and tanks. Compressed gas 
containers, cylinders and tanks shall comply with Chapters 30 
and 35 of the International Fire Code. 

[F] 703.2.1 Limitations for indoor storage and use. Flam- 
mable gas cylinders in occupancies regulated by the Inter- 
national Residential Code shall not exceed 250 cubic feet 
(7.1 m^) at normal temperature and pressure (NTP). 

[F] 703.2.2 Design and construction. Compressed gas 
containers, cylinders and tanks shall be designed, con- 
structed and tested in accordance with the Chapter 27 of the 
International Fire Code, ASME Boiler and Pressure Vessel 
Code (Section VIII) or DOTn 49 CFR, Parts 100-180. 



2006 INTERNATIONAL FUEL GAS CODE® 



125 



GASEOUS HYDROGEN SYSTEMS 



> 



[F] 703.3 Pressure relief devices. Pressure relief devices shall 
be provided in accordance with Sections 703.3.1 through 
703.3.8. Pressure relief devices shall be sized and selected in 
accordance with CGA S-1.1, CGA S-1.2 and CGA S-1.3. See 
Chapter 27 of the Phoenix Fire Code. 

[F] 703.3.1 Valves between pressure relief devices and 
containers. Valves including shutoffs, check valves and 
other mechanical restrictions shall not be installed between 
the pressure relief device and container being protected by 
the relief device. 

[F] 703.3.2 Installation. Valves and other mechanical 
restrictions shall not be located between the pressure relief 
device and the point of release to the atmosphere. 

[F] 703.3.3 Containers. Containers shall be provided with 
pressure relief devices in accordance with the ASME Boiler 
and Pressure Vessel Code (Section VIII), DOTn 49 CFR, 
Parts 100-180 and Section 703.3.7. 

[F] 703.3.4 Vessels other than containers. Vessels other 
than containers shall be protected with pressure relief 
devices in accordance with the ASME Boiler and Pressure 
Vessel Code (Section VIII), or DOTn 49 CFR, Parts 
100-180. 

[F] 703.3.5 Sizing. Pressure relief devices shall be designed 
and installed in accordance with Chapter 27 of the Phoenix 
Fire Code. 

[F] 703.3.6 Protection. Pressure relief devices and any 
associated vent piping shall be designed, installed and 
located so that their operation will not be affected by water 
or other debris accumulating inside the vent or obstructing 
the vent. 

[F] 703.3.7 Access. Pressure relief devices shall be located 
such that they are provided with ready access for inspection 
and repair. 

[F] 703.3.8 Configuration. Pressure relief devices shall be 
arranged to discharge unobstructed in accordance with Sec- 
tion 2209 of the International Fire Code. Discharge shall be 
directed to the outdoors in such a manner as to prevent 
impingement of escaping gas on personnel, containers, 
equipment and adjacent structures and to prevent introduc- 
tion of escaping gas into enclosed spaces. The discharge 
shall not terminate under eaves or canopies. 

Exception: This section shall not apply to DOTn-speci- 
fied containers with an internal volume of 2 cubic feet 
(0.057 m^) or less. 

[F] 703.4 Venting. Relief device vents shall be terminated in an 
approved location in accordance with Section 2209 of the 
International Fire Code. 

[F] 703.5 Security. Compressed gas containers, cyUnders, 
tanks and systems shall be secured against accidental 
dislodgement in accordance with Chapter 30 of the Interna- 
tional Fire Code. 

[F] 703.6 Electrical wiring and equipment. Electrical wiring 
and equipment shall comply with the ICC Electrical Code. 



SECTION 704 (IFGC) 
PIPING, USE AND HANDLING 

704.1 Applicability. Use and handling of containers, cylin- 
ders, tanks and hydrogen gas systems shall comply with this 
section. Gaseous hydrogen systems, equipment and machinery 
shall be listed or approved. 

704.1.1 Controls. Compressed gas system controls shall be 
designed to prevent materials from entering or leaving pro- 
cess or reaction systems at other than the intended time, rate 
or path. Automatic controls shall be designed to be fail safe 
in accordance with accepted engineering practice. 

704.1.2 Piping systems. Piping, tubing, valves and fittings 
conveying gaseous hydrogen shall be designed and 
installed in accordance with Sections 704.1.2.1 through 
704.1.2.5.1, Chapter 27 of the International Fire Code, 
and ASME B31.3. Cast-iron pipe, valves and fittings shall 
not be used. 

704.1.2.1 Sizing. Gaseous hydrogen piping shall be 
sized in accordance with approved engineering methods. 

704.1.2.2 Identification of hydrogen piping systems. 

Hydrogen piping systems shall be marked in accordance 
with ANSI A13.1. Markings used for piping systems 
shall consist of the name of the contents and shall include 
a direction-of-flow arrow. Markings shall be provided at 
all of the following locations: 

1 . At each valve. 

2. At wall, floor and ceiling penetrations. 

3. At each change of direction. 

4. At intervals not exceeding 20 feet (6096 mm). 

704.1.2.3 Piping design and construction. Piping and 
tubing materials shall be 300 series stainless steel or 
materials listed or approved for hydrogen service and the 
use intended through the full range of operating condi- 
tions to which they will be subjected. Piping systems 
shall be designed and constructed to provide allowance 
for expansion, contraction, vibration, settlement and fire 
exposure. 

704.1.2.3.1 Prohibited locations. Piping shall not be 
installed in or through a circulating air duct; clothes 
chute; chimney or gas vent; ventilating duct; dumb- 
waiter; or elevator shaft. Piping shall not be concealed 
or covered by the surface of any wall, floor or ceiling. 

704.1.2.3.2 Interior piping. Except for through pen- 
etrations, piping located inside of buildings shall be 
installed in exposed locations and provided with 
ready access for visual inspection. 

704.1.2.3.3 Underground piping. Underground pip- 
ing, including joints and fittings, shall be protected 
from corrosion and installed in accordance with 
approved engineered methods. 



126R 



2006 INTERNATIONAL FUEL GAS CODE® 



A Member of the International Code Family® 

International 




INTERNATIONAL 
CODE COUNCIL® 



Fuel 
Gas 
Code 






2006 



2006 International Fuel Gas Code' 



First Printing: January 2006 



ISBN-13: 978-1-58001-269-0 (soft) 

ISBN-10: 1-58001-269-8 (soft) 

ISBN-13: 978-1-58001-268-3 (loose leaf) 

ISBN-10: 1-58001-268-x (loose leaf) 

ISBN-13: 978-1-58001-305-5 (e-document) 

ISBN-10: 1-58001-305-8 (e-document) 



COPYRIGHT © 2006 

by 

INTERNATIONAL CODE COUNCIL, INC. 



ALL RIGHTS RESERVED. This 2006 International Fuel Gas Code® is a copyrighted work owned by the International Code 
Council, Inc. Without advance written permission from the copyright owner, no part of this book may be reproduced, distributed, or 
transmitted in any form or by any means, including, without limitation, electronic, optical or mechanical means (by way of example 
and not limitation, photocopying, or recording by or in an information storage retrieval system). For information on permission to 
copy material exceeding fair use, please contact: Publications, 4051 West Flossmoor Road, Country Club Hills, IL 60478-5795. 
Phone 1-888-ICC-SAFE (422-7233). 

Trademarks: "International Code Council," the "International Code Council" logo and the "International Fuel Gas Code" are trade- 
marks of the International Code Council, Inc. 



Material designated IFGS 

by 

AMEWCAN GAS ASSOCL^ION 

400 N. Capitol Street, N.W. • Washington, DC 20001 

(202) 824-7000Copyright © American Gas Association, 2006. All rights reserved. 



0407P-14323 PRINTED IN THE U.S . A. 



PREFACE 

Introduction 

Internationally, code officials recognize the need for a modem, up-to-date fuel gas code addressing the design and installation of 
fuel gas systems and gas-fired appliances through requirements emphasizing performance. The International Fuel Gas Code®, in 
this 2006 edition, is designed to meet these needs through model code regulations that safeguard the public health and safety in all 
communities, large and small. 

This comprehensive fuel gas code establishes minimum regulations for fuel gas systems and gas-fired appliances using prescrip- 
tive and performance-related provisions. It is founded on broad-based principles that make possible the use of new materials and 
new fuel gas system and appliance designs. This 2006 edition is fully compatible with all the International Codes® (I-Codes®) pub- 
lished by the International Code Council (ICC)®, including the International Building Code®, ICC Electrical Code®, International 
Energy Conservation Code®, International Existing Building Code®, International Fire Code®, International Mechanical Code®, 
ICC Performance Code®, International Plumbing Code®, International Private Sewage Disposal Code®, International Property 
Maintenance Code®, International Residential Code®, International Wildland- Urban Interface Code'^^ dindi International Zoning 
Code®. 

The International Fuel Gas Code provisions provide many benefits, among which is the model code development process that 
offers an international forum for fuel gas technology professionals to discuss performance and prescriptive code requirements. This 
forum provides an excellent arena to debate proposed revisions. This model code also encourages international consistency in the 
application of provisions. 

Development 

The first edition of the International Fuel Gas Code ( 1 997) was the culmination of an effort initiated in 1 996 by a development com- 
mittee appointed by ICC and consisting of representatives of the three statutory members of the International Code Council at that 
time, including: Building Officials and Code Administrators International, Inc. (BOCA), International Conference of Building 
Officials (ICBO) and Southern Building Code Congress International (SBCCI) and the gas industry. The intent was to draft a com- 
prehensive set of regulations for fuel gas systems and gas-fired appliances consistent with and inclusive of the scope of the existing 
mechanical, plumbing and gas codes. Technical content of the latest model codes promulgated by BOCA, ICBO, SBCCI and ICC 
and the National Fuel Gas Code (ANSI Z223 . 1 ) was utilized as the basis for the development. This 2006 edition presents the code as 
originally issued, with changes reflected in subsequent editions through 2003, and with code changes approved through the ICC 
Code Development Process through 2005 and standard revisions correlated with ANSI Z223. 1-2006. A new edition such as this is 
promulgated every three years. 

This code is founded on principles intended to establish provisions consistent with the scope of a fuel gas code that adequately 
protects public health, safety and welfare; provisions that do not unnecessarily increase construction costs; provisions that do not 
restrict the use of new materials, products or methods of construction; and provisions that do not give preferential treatment to par- 
ticular types or classes of materials, products or methods of construction. 

Format 

The International Fuel Gas Code is segregated by section numbers into two categories — "code" and "standard" — all coordinated 
and incorporated into a single document. The sections that are "code" are designated by the acronym "IFGC" next to the main sec- 
tion number (e.g.. Section 101). The sections that are "standard" are designated by the acronym "IFGS" next to the main section 
number (e.g., Section 304). 

Adoption 

The International Fuel Gas Code is available for adoption and use by jurisdictions internationally. Its use within a governmental 
jurisdiction is intended to be accomplished through adoption by reference in accordance with proceedings establishing the jurisdic- 
tion's laws. At the time of adoption, jurisdictions should insert the appropriate information in provisions requiring specific local 
information, such as the name of the adopting jurisdiction. These locations are shown in bracketed words in small capital letters in 
the code and in the sample ordinance. The sample adoption ordinance on page v addresses several key elements of a code adoption 
ordinance, including the information required for insertion into the code text. 

Maintenance 

The International Fuel Gas Code is kept up to date through the review of proposed changes submitted by code enforcing officials, 
industry representatives, design professionals and other interested parties. Proposed changes are carefully considered through an 



2006 INTERNATIONAL FUEL GAS CODE® iii 



open code development process in which all interested and affected parties may participate. The code development process of the 
International Fuel Gas Code is slightly different than the process for the other International Codes. 

Proposed changes to text designated "IFGC" are subject to the ICC Code Development Process. For more information regarding 
the code development process, contact the Code and Standard Development Department of the International Code Council. 

Proposed changes to text designated as "IFGS" are subject to the standards development process which maintains the National 
Fuel Gas Code (ANSI Z223.1). For more information regarding the standard development process, contact the American Gas 
Association (AGA) at 400 N. Capitol Street, N.W., Washington, DC 20001 . 

While the development procedure of the International Fuel Gas Code assures the highest degree of care, the ICC, its members, 
the AGA and those participating in the development of this code do not accept any liability resulting from compliance or noncompli- 
ance with the provisions because the ICC, its founding members and the AGA do not have the power or authority to police or enforce 
compliance with the contents of this code. Only the governmental body that enacts the code into law has such authority. 

Letter Designations in Front of Section Numbers 

In each code development cycle, proposed changes to the code are considered at the Code Development Hearings by the ICC Fuel 
Gas Code Development Committee, whose action constitutes a recommendation to the voting membership for final action on the 
proposed change. Proposed changes to a code section that has a number beginning with a letter in brackets are considered by a dif- 
ferent code development committee. For example, proposed changes to code sections that have [B] in front of them (e.g., [B]302.1) 
are considered by the International Building Code Development Committee at the code development hearings. 

The content of sections in this code that begin with a letter designation are maintained by another code development committee in 
accordance with the following: 

[B] = International Building Code Development Committee; 

[M] = International Mechanical Code Development Committee; and 

[F] = International Fire Code Development Committee. 

Marginal l\/larl(ings 

Solid vertical lines in the margins within the body of the code indicate a technical change from the requirements of the 2003 edition. 
Deletion indicators in the form of an arrow (^) are provided in the margin where an entire section, paragraph, exception or table has 
been deleted or item in a list of items or in a table has been deleted. 



2006 INTERNATIONAL FUEL GAS CODE*" 



ORDINANCE 

The International Codes are designed and promulgated to be adopted by reference by ordinance. Jurisdictions wishing to adopt the 
2006 International Fuel Gas Code as an enforceable regulation governing fuel gas systems and gas-fired appliances should ensure 
that certain factual information is included in the adopting ordinance at the time adoption is being considered by the appropriate 
governmental body. The following sample adoption ordinance addresses several key elements of a code adoption ordinance, includ- 
ing the information required for insertion into the code text. 

SAMPLE ORDINANCE FOR ADOPTION OF 
THE INTERNATIONAL FUEL GAS CODE 
ORDINANCE NO. 

An ordinance of the [JURISDICTION] adopting the 2006 edition of the International Fuel Gas Code, regulating and governing fuel 
gas systems and gas-fired appliances in the [JURISDICTION]; providing for the issuance of permits and collection of fees therefor- 
repealing Ordinance No. of the [JURISDICTION] and all other ordinances and parts of the ordinances in conflict therewith. 

The [GOVERNING BODY] of the [JURISDICTION] does ordain as follows: 

Section 1. That a certain document, three (3) copies of which are on file in the office of the [TITLE OF JURISDICTION'S KEEPER OF 
RECORDS] of [NAME OF JURISDICTION] , being marked and designated as the International Fuel Gas Code, 2006 edition, including 
Appendix Chapters [FILL IN THE APPENDIX CHAPTERS BEING ADOPTED] (see International Fuel Gas Code Section 101.3, 2006 edi- 
tion), as published by the International Code Council, be and is hereby adopted as the Fuel Gas Code of the [JURISDICTION], in the 
State of [STATE NAME] for regulating and governing fuel gas systems and gas-fired appliances as herein provided; providing for the 
issuance of permits and collection of fees therefor; and each and all of the regulations, provisions, penalties, conditions and terms of 
said Fuel Gas Code on file in the office of the [JURISDICTION] are hereby referred to, adopted, and made a part hereof, as if fully set 
out in this ordinance, with the additions, insertions, deletions and changes, if any, prescribed in Section 2 of this ordinance. 

Section 2. The following sections are hereby revised: 

Section 101.1. Insert: [NAME OF JURISDICTION] 

Section 106.5.2. Insert: [APPROPRIATE SCHEDULE] 

Section 106.5.3. Insert: [PERCENTAGES IN TWO LOCATIONS] 

Section 108.4. Insert: [SPECIFY OFFENSE] [AMOUNT] [NUMBER OF DAYS] 

Section 108.5. Insert: [AMOUNTS IN TWO LOCATIONS] 

Section 3. That Ordinance No. of [JURISDICTION] entitled [FILL IN HERE THE COMPLETE TITLE OF THE ORDINANCE OR 

ORDINANCES IN EFFECT AT THE PRESENT TIME SO THAT THEY WILL BE REPEALED BY DEFINITE MENTION] and all other ordinances 
or parts of ordinances in conflict herewith are hereby repealed. 

Section 4. That if any section, subsection, sentence, clause or phrase of this ordinance is, for any reason, held to be unconstitutional, 
such decision shall not affect the validity of the remaining portions of this ordinance. The [GOVERNING BODY] hereby declares that it 
would have passed this ordinance, and each section, subsection, clause or phrase thereof, irrespective of the fact that any one or more 
sections, subsections, sentences, clauses and phrases be declared unconstitutional. 

Section 5. That nothing in this ordinance or in the Fuel Gas Code hereby adopted shall be construed to affect any suit or proceeding 
impending in any court, or any rights acquired, or liability incurred, or any cause or causes of action acquired or existing, under any 
act or ordinance hereby repealed as cited in Section 3 of this ordinance; nor shall any just or legal right or remedy of any character be 
lost, impaired or affected by this ordinance. 

Section 6. That the [JURISDICTION'S KEEPER OF RECORDS] is hereby ordered and directed to cause this ordinance to be published. 
(An additional provision may be required to direct the number of times the ordinance is to be published and to specify that it is to be 
in a newspaper in general circulation. Posting may also be required.) 

Section 7. That this ordinance and the rules, regulations, provisions, requirements, orders and matters established and adopted 
hereby shall take effect and be in full force and effect [TIME PERIOD] from and after the date of its final passage and adoption. 



2006 INTERNATIONAL FUEL GAS CODE*^ 



2006 INTERNATIONAL FUEL GAS CODE® 



TABLE OF CONTENTS 



CHAPTER 1 ADMINISTRATION 1 

Section 

101 General (IFGC) 1 

102 Applicability (IFGC) 1 

103 Department of Inspection (IFGC) 2 

104 Duties and Powers of the 

Code Official (IFGC) 2 

105 Approval (IFGC) 3 

106 Permits (IFGC) 3 

107 Inspections and Testing (IFGC) 5 

108 Violations (IFGC) 6 

109 Means of Appeal (IFGC) 6 

CHAPTER 2 DEFINITIONS 9 

Section 

201 General (IFGC) 9 

202 General Definitions (IFGC) 9 

CHAPTER 3 GENERAL REGULATIONS 17 

Section 

301 General (IFGC) 17 

302 Structural Safety (IFGC) 18 

303 Appliance Location (IFGC) 18 

304 Combustion, Ventilation, and 

Dilution Air (IFGS) 19 

305 Installation (IFGC) 22 

306 Access and Service Space (IFGC) 23 

307 Condensate Disposal (IFGC) 24 

308 Clearance Reduction (IFGS) 24 

309 Electrical (IFGC) 27 

310 Electrical Bonding (IFGS) 27 

CHAPTER 4 GAS PIPING INSTALLATIONS .... 29 

Section 

401 General (IFGC) 29 

402 Pipe Sizing (IFGS) 29 

403 Piping Materials (IFGS) 64 

404 Piping System Installadon (IFGC) 66 

405 Pipe Bends and Changes in 

Direction (IFGS) 68 

406 Inspection, Testing and Purging (IFGS) 68 

407 Piping Support (IFGC) 70 

408 Drips and Sloped Piping (IFGC) 70 

2006 INTERNATIONAL FUEL GAS CODE® 



409 Shutoff Valves (IFGC) 70 

410 Flow Controls (IFGC) 71 

411 Appliance and Manufactured 

Home Connections (IFGC) 71 

412 Liquefied Petroleum Gas Motor Vehicle 

Fuel-dispensing Stations (IFGC) 72 

413 Compressed Natural Gas Motor Vehicle 

Fuel-dispensing Stations (IFGC) 73 

414 Supplemental and Standby 

Gas Supply (IFGC) 74 

415 Piping Support Intervals (IFGS) 74 

416 Overpressure Protection Devices 75 

CHAPTER 5 CHIMNEYS AND VENTS 77 

Section 

501 General (IFGC) 77 

502 Vents (IFGC) 78 

503 Venting of Appliances (IFGS) 79 

504 Sizing of Category I Appliance 

Venting Systems (IFGS) 88 

505 Direct- Vent, Integral Vent, Mechanical Vent and 

Ventilation/Exhaust Hood Venting (IFGC) . . 105 

506 Factory-built Chimneys (IFGC) 105 

CHAPTER 6 SPECIFIC APPLIANCES 115 

Section 

601 General (IFGC) 115 

602 Decorative Appliances for Installation 

in Fireplaces (IFGC) 115 

603 Log Lighters (IFGC) 115 

604 Vented Gas Fireplaces 

(Decorative Appliances) (IFGC) 115 

605 Vented Gas Fireplace Heaters (IFGC) 115 

606 Incinerators and Crematories (IFGC) 115 

607 Commercial-Industrial Incinerators (IFGC) ... 115 

608 Vented Wall Furnaces (IFGC) 115 

609 Floor Furnaces (IFGC) 116 

610 Duct Furnaces (IFGC) 116 

611 Nonrecirculating Direct-fired Industrial 

Air Heaters (IFGC) 116 

612 Recirculating Direct-fired Industrial Air 

Heaters (IFGC) 117 

613 Clothes Dryers (IFGC) 117 

614 Clothes Dryer Exhaust (IFGC) 117 

615 Sauna Heaters (IFGC) 118 



VII 



TABLE OF CONTENTS 



616 Engine and Gas Turbine-powered 

Equipment (IFGC) 119 

617 Pool and Spa Heaters (IFGC) 119 

618 Forced-air Warm-air Furnaces (IFGC) 119 

619 Conversion Burners (IFGC) 119 

620 Unit Heaters (IFGC) 120 

621 Unvented Room Heaters (IFGC) 120 

622 Vented Room Heaters (IFGC) 120 

623 Cooking Appliances (IFGC) 120 

624 Water Heaters (IFGC) 121 

625 Refrigerators (IFGC) 121 

626 Gas-fired Toilets (IFGC) 121 

627 Air-conditioning Equipment (IFGC) 121 

628 Illuminating Appliances (IFGC) 122 

629 Small Ceramic Kilns (IFGC) 122 

630 Infrared Radiant Heaters (IFGC) 122 

631 Boilers (IFGC) 122 

632 Equipment Installed in Existing 

Unlisted Boilers (IFGC) 122 

633 Stationary Fuel-cell Power Plants (IFGC) . 122 

634 Chimney Damper Opening 

Area (IFGS) 123 

635 Gaseous Hydrogen Systems 123 

CHAPTER 7 GASEOUS HYDROGEN 

SYSTEMS 125 

Section 

701 General (IFGC) 125 

702 General Definitions (IFGC) 125 

703 General Requirements (IFGC) 125 

704 Piping, Use and Handling (IFGC) 126 

705 Testing of Hydrogen Piping Systems (IFGC) . . 127 

706 Location of Gaseous 

Hydrogen Systems (IFGC) 128 

707 Operation and Maintenance of Gaseous 

Hydrogen Systems (IFGC) 129 

708 Design of Liquefied Hydrogen Systems 

Associated With Hydrogen Vaporization 
Operations (IFGC) 129 

viii 



CHAPTER 8 REFERENCED STANDARDS ..... 131 

APPENDIX A SIZING AND CAPACITIES OF 

GAS PIPING (IFGS) 135 

APPENDIX B SIZING OF VENTING SYSTEMS 
SERVING APPLIANCES 
EQUIPPED WITH DRAFT 
HOODS, CATEGORY I 
APPLIANCES, AND 
APPLIANCES LISTED 
FOR USE WITH TYPE B 
VENTS (IFGS) 147 

APPENDIX C EXIT TERMINALS OF 

MECHANICAL DRAFT AND 
DIRECT- VENT VENTING 
SYSTEMS (IFGS) 157 

APPENDIX D RECOMMENDED PROCEDURE 
FOR SAFETY INSPECTION OF 
AN EXISTING APPLIANCE 
INSTALLATION (IFGS) 159 

INDEX 161 



2006 INTERNATIONAL FUEL GAS CODE*' 



CHAPTER 1 

ADMINISTRATION 



SECTION 101 (IFGC) 
GENERAL 

101.1 Title. These regulations shall be known as the Fuel Gas 
Code of [NAME OF JURISDICTION], hereinafter referred to as 
"this code." 

101.2 Scope. This code shall apply to the installation of fuel 

I gas piping systems, fuel gas utilization equipment, gaseous 
hydrogen systems and related accessories in accordance with 
Sections 101.2.1 through 101.2.5. 

Exception: Detached one- and two-family dwellings and 
multiple single-family dwellings (townhouses) not more 
than three stories high with separate means of egress and 
their accessory structures shall comply with the Interna- 
tional Residential Code. 

■► 101.2.1 Gaseous hydrogen systems. Gaseous hydrogen 
systems shall be regulated by Chapter 7. 

101.2.2 Piping systems. These regulations cover piping 
systems for natural gas with an operating pressure of 125 
pounds per square inch gauge (psig) (862 kPa gauge) or 
less, and for LP-gas with an operating pressure of 20 psig 
(140 kPa gauge) or less, except as provided in Section 
402.6. 1 . Coverage shall extend from the point of delivery to 
the outlet of the equipment shutoff valves. Piping systems 
requirements shall include design, materials, components, 
fabrication, assembly, installation, testing, inspection, oper- 
ation and maintenance. 

101.2.3 Gas utilization equipment. Requirements for gas 
utilization equipment and related accessories shall include 
installation, combustion and ventilation air and venting and 
connections to piping systems. 

101.2.4 Systems and equipment outside the scope. This 
code shall not apply to the following: 

1. Portable LP-gas equipment of all types that is not 
connected to a fixed fuel piping system. 

2. Installation of farm equipment such as brooders, 
dehydrators, dryers and irrigation equipment. 

3. Raw material (feedstock) applications except for 
piping to special atmosphere generators. 

4. Oxygen-fuel gas cutting and welding systems. 

5. Industrial gas applications using gases such as acet- 
ylene and acetylenic compounds, hydrogen, ammo- 
nia, carbon monoxide, oxygen and nitrogen. 

6. Petroleum refineries, pipeline compressor or pump- 
ing stations, loading terminals, compounding 
plants, refinery tank farms and natural gas process- 
ing plants. 

7 . Integrated chemical plants or portions of such plants 
where flammable or combustible liquids or gases 
are produced by, or used in, chemical reactions. 



8. LP-gas installations at utility gas plants. 

9. Liquefied natural gas (LNG) installations. 

10. Fuel gas piping in power and atomic energy plants. 

1 1 . Proprietary items of equipment, apparatus or instru- 
ments such as gas-generating sets, compressors and 
calorimeters. 

12. LP-gas equipment for vaporization, gas mixing and 
gas manufacturing. 

13. Temporary LP-gas piping for buildings under con- 
struction or renovation that is not to become part of 
the permanent piping system. 

14. Installation of LP-gas systems for railroad switch 
heating. 

15. Installation of hydrogen gas, LP-gas and com- 
pressed natural gas (CNG) systems on vehicles. 

16. Except as provided in Section 401.1.1, gas piping, 
meters, gas pressure regulators and other appurte- 
nances used by the serving gas supplier in the distri- 
bution of gas, other than undiluted LP-gas. 

17. Building design and construction, except as speci- 
fied herein. 

1 8 . Piping systems for mixtures of gas and air within the 
flammable range with an operating pressure greater 
than 10 psig (69 kPa gauge). 

19. Portable fuel cell appliances that are neither con- 
nected to a fixed piping system nor interconnected 
to a power grid. 

101.2.5 Other fuels. The requirements for the design, 
installation, maintenance, alteration and inspection of 
mechanical systems operating with fuels other than fuel gas 
shall be regulated by the International Mechanical Code. 

101.3 Appendices. Provisions in the appendices shall not 
apply unless specifically adopted. 

101.4 Intent. The purpose of this code is to provide minimum 
standards to safeguard life or limb, health, property and public 
welfare by regulating and controlling the design, construction, 
installation, quality of materials, location, operation and main- 
tenance or use of fuel gas systems. 

101.5 Severability. If a section, subsection, sentence, clause or 
phrase of this code is, for any reason, held to be unconstitu- 
tional, such decision shall not affect the vaUdity of the remain- 
ing portions of this code. 



SECTION 102 (IFGC) 
APPLICABILITY 

102.1 General. The provisions of this code shall apply to all 
matters affecting or relating to structures and premises, as set 
forth in Section 101. Where, in a specific case, different sec- 



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tions of this code specify different materials, methods of con- 
struction or other requirements, the most restrictive shall 
govern. 

102.2 Existing installations. Except as otherwise provided for 
in this chapter, a provision in this code shall not require the 
removal, alteration or abandonment of, nor prevent the contin- 
ued utilization and maintenance of, existing installations law- 
fully in existence at the time of the adoption of this code. 

[EB] 102.2.1 Existing buildings. Additions, alterations, 
renovations or repairs related to building or structural issues 
shall be regulated by the International Building Code. 

102.3 Maintenance. Installations, both existing and new, and 
parts thereof shall be maintained in proper operating condition 
in accordance with the original design and in a safe condition. 
Devices or safeguards which are required by this code shall be 
maintained in compliance with the code edition under which 
they were installed. The owner or the owner's designated agent 
shall be responsible for maintenance of installations. To deter- 
mine compliance with this provision, the code official shall 
have the authority to require an installation to be reinspected. 

102.4 Additions, alterations or repairs. Additions, alter- 
ations, renovations or repairs to installations shall conform to 
that required for new installations without requiring the exist- 
ing installation to comply with all of the requirements of this 
code. Additions, alterations or repairs shall not cause an exist- 
ing installation to become unsafe, hazardous or overloaded. 

Minor additions, alterations, renovations and repairs to 
existing installations shall meet the provisions for new con- 
struction, unless such work is done in the same manner and 
arrangement as was in the existing system, is not hazardous and 
is approved. 

102.5 Change in occupancy. It shall be unlawful to make a 
change in the occupancy of a structure which will subject the 
structure to the special provisions of this code applicable to the 
new occupancy without approval. The code official shall cer- 
tify that such structure meets the intent of the provisions of law 
governing building construction for the proposed new occu- 
pancy and that such change of occupancy does not result in any 
hazard to the public health, safety or welfare. 

102.6 Historic buildings. The provisions of this code relating 
to the construction, alteration, repair, enlargement, restoration, 
relocation or moving of buildings or structures shall not be 
mandatory for existing buildings or structures identified and 
classified by the state or local jurisdiction as historic buildings 
when such buildings or structures are judged by the code offi- 
cial to be safe and in the public interest of health, safety and 
welfare regarding any proposed construction, alteration, 
repair, enlargement, restoration, relocation or moving of build- 
ings. 

102.7 Moved buildings. Except as determined by Section 
102.2, installations that are a part of buildings or structures 
moved into or within the jurisdiction shall comply with the pro- 
visions of this code for new installations. 

102.8 Referenced codes and standards. The codes and stan- 
dards referenced in this code shall be those that are listed in 
Chapter 8 and such codes and standards shall be considered 
part of the requirements of this code to the prescribed extent of 



each such reference. Where differences occur between provi- 
sions of this code and the referenced standards, the provisions 
of this code shall apply. 

Exception: Where enforcement of a code provision would 
violate the conditions of the listing of the equipment or 
appliance, the conditions of the listing and the manufac- 
turer's installation instructions shall apply. 

102.9 Requirements not covered by code. Requirements nec- 
essary for the strength, stability or proper operation of an exist- 
ing or proposed installation, or for the public safety, health and 
general welfare, not specifically covered by this code, shall be 
determined by the code official. 



SECTION 103 (IFGC) 
DEPARTMENT OF INSPECTION 

103.1 General. The Department of Inspection is hereby cre- 
ated and the executive official in charge thereof shall be known 
as the code official. 

103.2 Appointment. The code official shall be appointed by 
the chief appointing authority of the jurisdiction; and the code 
official shall not be removed from office except for cause and 
after full opportunity to be heard on specific and relevant 
charges by and before the appointing authority. 

103.3 Deputies. In accordance with the prescribed procedures 
of this jurisdiction and with the concurrence of the appointing 
authority, the code official shall have the authority to appoint a 
deputy code official, other related techiiical officers, inspectors 
and other employees. 

103.4 Liability. The code official, officer or employee charged 
with the enforcement of this code, while acting for the jurisdic- 
tion, shall not thereby be rendered liable personally, and is 
hereby relieved from all personal liabihty for any damage 
accruing to persons or property as a result of an act required or 
permitted in the discharge of official duties. 

Any suit instituted against any officer or employee because 
of an act performed by that officer or employee in the lawful 
discharge of duties and under the provisions of this code shall 
be defended by the legal representative of the jurisdiction until 
the final termination of the proceedings. The code official or 
any subordinate shall not be liable for costs in an action, suit or 
proceeding that is instituted in pursuance of the provisions of 
this code; and any officer of the Department of Inspection, act- 
ing in good faith and without malice, shall be free from liability 
for acts performed under any of its provisions or by rea.son of 
any act or omission in the performance of official duties in con- 
nection therewith. 



SECTION 104 (IFGC) 
DUTIES AND POWERS OF THE CODE OFFICIAL 

104.1 General. The code official shall enforce the provisions 
of this code and shall act on any question relative to the installa- 
tion, alteration, repair, maintenance or operation of systems, 
except as otherwise specifically provided for by statutory 
requirements or as provided for in Sections 104.2 through 
104.8. 



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104.2 Rule-making authority. The code official shall have 
authority as necessary in the interest of public health, safety 
and general welfare to adopt and promulgate rules and regula- 
tions; interpret and implement the provisions of this code; 
secure the intent thereof and designate requirements applicable 
because of local climatic or other conditions. Such rules shall 
not have the effect of waiving structural or fire performance 
requirements specifically provided for in this code, or of violat- 
ing accepted engineering methods involving public safety. 

104.3 Applications and permits. The code official shall 
receive appUcations and issue permits for installations and 
alterations under the scope of this code, inspect the premises 
for which such permits have been issued and enforce compli- 
ance with the provisions of this code. 

104.4 Inspections. The code official shall make all of the 
required inspections, or shall accept reports of inspection by 
approved agencies or individuals. All reports of such inspec- 
tions shall be in writing and shall be certified by a responsible 
officer of such approved agency or by the responsible individ- 
ual. The code official is authorized to engage such expert opin- 
ion as deemed necessary to report upon unusual technical 
issues that arise, subject to the approval of the appointing 
authority. 

104.5 Right of entry. Whenever it is necessary to make an 
inspection to enforce the provisions of this code, or whenever 
the code official has reasonable cause to believe that there 
exists in a building or upon any premises any conditions or vio- 
lations of this code that make the building or premises unsafe, 
dangerous or hazardous, the code official shall have the author- 
ity to enter the building or premises at all reasonable times to 
inspect or to perform the duties imposed upon the code official 
by this code. If such building or premises is occupied, the code 
official shall present credentials to the occupant and request 
entry. If such building or premises is unoccupied, the code offi- 
cial shall first make a reasonable effort to locate the owner or 
other person having charge or control of the building or pre- 
mises and request entry. If entry is refused, the code official has 
recourse to every remedy provided by law to secure entry. 

When the code official has first obtained a proper inspection 
warrant or other remedy provided by law to secure entry, an 
owner or occupant or person having charge, care or control of 
the building or premises shall not fail or neglect, after proper 
request is made as herein provided, to promptly permit entry 
therein by the code official for the purpose of inspection and 
examination pursuant to this code. 

104.6 Identification. The code official shall carry proper iden- 
tification when inspecting structures or premises in the perfor- 
mance of duties under this code. 

104.7 Notices and orders. The code official shall issue all nec- 
essary notices or orders to ensure compliance with this code. 

104.8 Department records. The code official shall keep offi- 
cial records of applications received, permits and certificates 
issued, fees collected, reports of inspections, and notices and 
orders issued. Such records shall be retained in the official 
records as long as the building or structure to which such 
records relate remains in existence, unless otherwise provided 
for by other regulations. 



SECTION 105 (IFGC) 
APPROVAL 

105.1 Modifications. Whenever there are practical difficulties 
involved in carrying out the provisions of this code, the code 
official shall have the authority to grant modifications for indi- 
vidual cases, provided the code official shall first find that spe- 
cial individual reason makes the strict letter of this code 
impractical and that such modification is in compliance with 
the intent and purpose of this code and does not lessen health, 
life and fire safety requirements. The details of action granting 
modifications shall be recorded and entered in the files of the 
Department of Inspection. 

105.2 Alternative materials, methods and equipment. The 

provisions of this code are not intended to prevent the installa- 
tion of any material or to prohibit any method of construction 
not specifically prescribed by this code, provided that any such 
alternative has been approved. An alternative material or 
method of construction shall be approved where the code offi- 
cial finds that the proposed design is satisfactory and complies 
with the intent of the provisions of this code, and that the mate- 
rial, method or work offered is, for the purpose intended, at 
least the equivalent of that prescribed in this code in quality, 
strength, effectiveness, fire resistance, durability and safety. 

105.3 Required testing. Whenever there is insufficient evi- 
dence of compliance with the provisions of this code, evidence 
that a material or method does not conform to the requirements 
of this code, or in order to substantiate claims for alternative 
materials or methods, the code official shall have the authority 
to require tests as evidence of compliance to be made at no 
expense to the jurisdiction. 

105.3.1 Test methods. Test methods shall be as specified in 
this code or by other recognized test standards. In the 
absence of recognized and accepted test methods, the code 
official shall approve the testing procedures. 

105.3.2 Testing agency. All tests shall be performed by an 
approved agency. 

105.3.3 Test reports. Reports of tests shall be retained by 
the code official for the period required for retention of pub- 
lic records. 

105.4 Material and equipment reuse. Materials, equipment 
and devices shall not be reused unless such elements have been 
reconditioned, tested and placed in good and proper working 
condition, and approved. 



SECTION 106 (IFGC) 
PERMITS 

106.1 When required. An owner, authorized agent or contrac- 
tor who desires to erect, install, enlarge, alter, repair, remove, 
convert or replace an installation regulated by this code, or to 
cause such work to be done, shall first make application to the 
code official and obtain the required permit for the work. 

Exception: Where equipment replacements and repairs are 
required to be performed in an emergency situation, the per- 
mit application shall be submitted within the next working 
business day of the Department of Inspection. 



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106.2 Permits not required. Permits shall not be required for 
the following: 

1. Any portable heating appliance. 

2. Replacement of any minor component of equipment that 
does not alter approval of such equipment or make such 
equipment unsafe. 

Exemption from the permit requirements of this code shall 
not be deemed to grant authorization for work to be done in vio- 
lation of the provisions of this code or of other laws or ordi- 
nances of this jurisdiction. 

106.3 Application for permit. Each application for a permit, 
with the required fee, shall be filed with the code official on a 
form furnished for that purpose and shall contain a general 
description of the proposed work and its location. The applica- 
tion shall be signed by the owner or an authorized agent. The 
permit application shall indicate the proposed occupancy of all 
parts of the building and of that portion of the site or lot, if any, 
not covered by the building or structure and shall contain such 
other information required by the code official. 

106.3.1 Construction documents. Construction docu- 
ments, engineering calculations, diagrams and other data 
shall be submitted in two or more sets with each application 
for a permit. The code official shall require construction 
documents, computations and specifications to be prepared 
and designed by a registered design professional when 
required by state law. Construction documents shall be 
drawn to scale and shall be of sufficient clarity to indicate 
the location, nature and extent of the work proposed and 
show in detail that the work conforms to the provisions of 
this code. Construction documents for buildings more than 
two stories in height shall indicate where penetrations will 
be made for installations and shall indicate the materials and 
methods for maintaining required structural safety, 
fire-resistance rating and fireblocking. 

Exception: The code official shall have the authority to 
waive the submission of construction documents, calcu- 
lations or other data if the nature of the work applied for 
is such that reviewing of construction documents is not 
necessary to determine compUance with this code. 

106.4 Permit issuance. The application, construction docu- 
ments and other data filed by an applicant for a permit shall be 
reviewed by the code official. If the code official finds that the 
proposed work conforms to the requirements of this code and 
all laws and ordinances applicable thereto, and that the fees 
specified in Section 106.5 have been paid, a permit shall be 
issued to the applicant. 

106.4.1 Approved construction documents. When the 
code official issues the permit where construction docu- 
ments are required, the construction documents shall be 
endorsed in writing and stamped "APPROVED." Such 
approved construction documents shall not be changed, 
modified or altered without authorization from the code 
official. Work shall be done in accordance with the 
approved construction documents. 

The code official shall have the authority to issue a permit 
for the construction of part of an installation before the con- 
struction documents for the entire installation have been 



submitted or approved, provided adequate information and 
detailed statements have been filed complying with all perti- 
nent requirements of this code. The holder of such permit 
shall proceed at his or her own risk without assurance that 
the permit for the entire installation will be granted. 

106.4.2 Validity. The issuance of a permit or approval of 
construction documents shall not be construed to be a per- 
mit for, or an approval of, any violation of any of the provi- 
sions of this code or of other ordinances of the jurisdiction. 
A permit presuming to give authority to violate or cancel the 
provisions of this code shall be invalid. 

The issuance of a permit based upon construction docu- 
ments and other data shall not prevent the code official from 
thereafter requiring the correction of errors in said construc- 
tion documents and other data or from preventing building 
operations from being carried on thereunder when in viola- 
tion of this code or of other ordinances of this jurisdiction. 

106.4.3 Expiration. Every permit issued by the code offi- 
cial under the provisions of this code shall expire by limita- 
tion and become null and void if the work authorized by 
such permit is not commenced within 180 days from the 
date of such permit, or is suspended or abandoned at any 
time after the work is commenced for a period of 180 days. 
Before such work recommences, a new permit shall be first 
obtained and the fee, therefor, shall be one-half the amount 
required for a new permit for such work, provided no 
changes have been or will be made in the original construc- 
tion documents for such work, and further that such suspen- 
sion or abandonment has not exceeded one year. 

106.4.4 Extensions. A permittee holding an unexpired per- 
mit shall have the right to apply for an extension of the time 
within which he or she will conmience work under that per- 
mit when work is unable to be commenced within the time 
required by this section for good and satisfactory reasons. 
The code official shall extend the time for action by the 
permittee for a period not exceeding 1 80 days if there is rea- 
sonable cause. A permit shall not be extended more than 
once. The fee for an extension shall be one-half the amount 
required for a new permit for such work. 

106.4.5 Suspension or revocation of permit. The code 
official shall revoke a permit or approval issued under the 
provisions of this code in case of any false statement or mis- 
representation of fact in the application or on the construc- 
tion documents upon which the permit or approval was 
based. 

106.4.6 Retention of construction documents. One set of 

construction documents shall be retained by the code offi- 
cial until final approval of the work covered therein. One set 
of approved construction documents shall be returned to the 
applicant, and said set shall be kept on the site of the build- 
ing or work at all times during which the work authorized 
thereby is in progress. 

106.5 Fees. A permit shall not be issued until the fees pre- 
scribed in Section 106.5.2 have been paid, nor shall an amend- 
ment to a permit be released until the additional fee, if any, due 
to an increase of the installation, has been paid. 



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106.5.1 Work commencing before permit issuance. Any 

person who commences work on an installation before 
obtaining the necessary permits shall be subject to 100 per- 
cent of the usual permit fee in addition to the required permit 
fees. 

106.5.2 Fee schedule. The fees for work shall be as indi- 
cated in the following schedule. 

[JURISDICTION TO INSERT APPROPRIATE SCHEDULE] 

106.5.3 Fee refunds. The code official shall authorize the 
refunding of fees as follows. 

1 . The full amount of any fee paid hereunder which was 
erroneously paid or collected. 

2. Not more than [SPECIFY PERCENTAGE] percent of the 
permit fee paid when no work has been done under a 
permit issued in accordance with this code. 

3. Not more than [SPECIFY PERCENTAGE] percent of the 
plan review fee paid when an application for a permit 
for which a plan review fee has been paid is with- 
drawn or canceled before any plan review effort has 
been expended. 

The code official shall not authorize the refunding of any 
fee paid, except upon written application filed by the origi- 
nal permittee not later than 180 days after the date of fee 
payment. 



SECTION 107 (IFGC) 
INSPECTIONS AND TESTING 

107.1 Required inspections and testing. The code official, 
upon notification from the permit holder or the permit holder's 
agent, shall make the following inspections and other such 
inspections as necessary, and shall either release that portion of 
the construction or notify the permit holder or the permit 
holder's agent of violations that are required to be corrected. 
The holder of the permit shall be responsible for scheduling 
such inspections. 

1 . Underground inspection shall be made after trenches or 
ditches are excavated and bedded, piping is installed and 
before backfill is put in place. When excavated soil con- 
tains rocks, broken concrete, frozen chunks and other 
rubble that would damage or break the piping or cause 
corrosive action, clean backfill shall be on the job site. 

2. Rough-in inspection shall be made after the roof, fram- 
ing, fireblocking and bracing are in place and compo- 
nents to be concealed are complete, and prior to the 
installation of wall or ceiling membranes. 

3. Final inspection shall be made upon completion of the 
installation. 

The requirements of this section shall not be considered to 
prohibit the operation of any heating equipment installed to 
replace existing heating equipment serving an occupied por- 
tion of a structure in the event a request for inspection of such 
heating equipment has been filed with the department not more 
than 48 hours after replacement work is completed, and before 
any portion of such equipment is concealed by any permanent 
portion of the structure. 



107.1.1 Approved inspection agencies. The code official 
shall accept reports of approved agencies, provided that 
such agencies satisfy the requirements as to quahfications 
and reliability. 

107.1.2 Evaluation and follow-up inspection services. 

Prior to the approval of a prefabricated construction assem- 
bly having concealed work and the issuance of a permit, the 
code official shall require the submittal of an evaluation 
report on each prefabricated construction assembly, indicat- 
ing the complete details of the installation, including a 
description of the system and its components, the basis upon 
which the system is being evaluated, test results and similar 
information and other data as necessary for the code official 
to determine conformance to this code. 

107.1.2.1 Evaluation service. The code official shall 
designate the evaluation service of an approved agency 
as the evaluation agency, and review such agency's eval- 
uation report for adequacy and conformance to this code. 

107.1.2.2 Follow-up inspection. Except where ready 
access is provided to installations, service equipment and 
accessories for complete inspection at the site without 
disassembly or dismantling, the code official shall con- 
duct the in-plant inspections as frequently as necessary 
to ensure conformance to the approved evaluation report 
or shall designate an independent, approved inspection 
agency to conduct such inspections. The inspection 
agency shall furnish the code official with the follow-up 
inspection manual and a report of inspections upon 
request, and the installation shall have an identifying 
label permanently affixed to the system indicating that 
factory inspections have been performed. 

107.1.2.3 Test and inspection records. Required test 
and inspection records shall be available to the code offi- 
cial at all times during the fabrication of the installation 
and the erection of the building; or such records as the 
code official designates shall be filed. 

107.2 Testing. Installations shall be tested as required in this 
code and in accordance with Sections 107.2.1 through 107.2.3. 
Tests shall be made by the permit holder and observed by the 
code official. 

107.2.1 New, altered, extended or repaired installations. 

New installations and parts of existing installations, which 
have been altered, extended, renovated or repaired, shall be 
tested as prescribed herein to disclose leaks and defects. 

107.2.2 Apparatus, instruments, material and labor for 
tests. Apparatus, instruments, material and labor required 
for testing an installation or part thereof shall be furnished 
by the permit holder. 

107.2.3 Reinspection and testing. Where any work or 
installation does not pass an initial test or inspection, the 
necessary corrections shall be made so as to achieve compU- 
ance with this code. The work or installation shall then be 
resubmitted to the code official for inspection and testing. 

107.3 Approval. After the prescribed tests and inspections 
indicate that the work complies in all respects with this code, a 
notice of approval shall be issued by the code official. 



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107.4 Temporary connection. The code official shall have the 
authority to allow the temporary connection of an installation 
to the sources of energy for the purpose of testing the installa- 
tion or for use under a temporary certificate of occupancy. 



SECTION 108 (IFGC) 
VIOLATIONS 

108.1 Unlawful acts. It shall be unlawful for a person, firm or 
corporation to erect, construct, alter, repair, remove, demolish 
or utilize an installation, or cause same to be done, in conflict 
with or in violation of any of the provisions of this code. 

108.2 Notice of violation. The code official shall serve a notice 
of violation or order to the person responsible for the erection, 
installation, alteration, extension, repair, removal or demoli- 
tion of work in violation of the provisions of this code, or in 
violation of a detail statement or the approved construction 
documents thereunder, or in violation of a permit or certificate 
issued under the provisions of this code. Such order shall direct 
the discontinuance of the illegal action or condition and the 
abatement of the violation. 

108.3 Prosecution of violation. If the notice of violation is not 
complied with promptly, the code official shall request the legal 
counsel of the jurisdiction to institute the appropriate proceed- 
ing at law or in equity to restrain, correct or abate such viola- 
tion, or to require the removal or termination of the unlawful 
occupancy of the structure in violation of the provisions of this 
code or of the order or direction made pursuant thereto. 

108.4 Violation penalties. Persons who shall violate a provi- 
sion of this code, fail to comply with any of the requirements 
thereof or erect, install, alter or repair work in violation of the 
approved construction documents or directive of the code offi- 
cial, or of a permit or certificate issued under the provisions of 
this code, shall be guilty of a [SPECIFY offense], punishable by 
a fine of not more than [AMOUNT] dollars or by imprisonment 
not exceeding [number of days], or both such fine and impris- 
onment. Each day that a violation continues after due notice 
has been served shall be deemed a separate offense. 

108.5 Stop work orders. Upon notice from the code official 
that work is being done contrary to the provisions of this code 
or in a dangerous or unsafe manner, such work shall immedi- 
ately cease. Such notice shall be in writing and shall be given to 
the owner of the property, the owner's agent, or the person 
doing the work. The notice shall state the conditions under 
which work is authorized to resume. Where an emergency 
exists, the code official shall not be required to give a written 
notice prior to stopping the work. Any person who shall con- 
tinue any work on the system after having been served with a 
stop work order, except such work as that person is directed to 
perform to remove a violation or unsafe condition, shall be lia- 
ble for a fine of not less than [AMOUNT] dollars or more than 
[AMOUNT] dollars. 

108.6 Abatement of violation. The imposition of the penalties 
herein prescribed shall not preclude the legal officer of the 
jurisdiction from instituting appropriate action to prevent 
unlawful construction, restrain, correct or abate a violation, 
prevent illegal occupancy of a building, structure or premises. 



or stop an illegal act, conduct, business or utilization of the 
installations on or about any premises. 

108.7 Unsafe installations. An installation that is unsafe, con- 
stitutes a fire or health hazard, or is otherwise dangerous to 
human life, as regulated by this code, is hereby declared an 
unsafe installation. Use of an installation regulated by this code 
constituting a hazard to health, safety or welfare by reason of 
inadequate maintenance, dilapidation, fire hazard, disaster, 
damage or abandonment is hereby declared an unsafe use. 
Such unsafe installations are hereby declared to be a public nui- 
sance and shall be abated by repair, rehabilitation, demolition 
or removal. 

108.7.1 Authority to condemn installations. Whenever 
the code official determines that any installation, or portion 
thereof, regulated by this code has become hazardous to life, 
health or property, he or she shall order in writing that such 
installations either be removed or restored to a safe condi- 
tion. A time limit for compliance with such order shall be 
specified in the written notice. A person shall not use or 
maintain a defective installation after receiving such notice. 

When such installation is to be disconnected, written 
notice as prescribed in Section 108.2 shall be given. In cases 
of immediate danger to life or property, such disconnection 
shall be made immediately without such notice. 

108.7.2 Authority to disconnect service utilities. The code 
official shall have the authority to require disconnection of 
utility service to the building, structure or system regulated 
by the technical codes in case of emergency where neces- 
sary to eliminate an immediate hazard to life or property. 
The code official shall notify the serving utility, and wher- 
ever possible, the owner and occupant of the building, struc- 
ture or service system of the decision to disconnect prior to 
taking such action. If not notified prior to disconnection, the 
owner or occupant of the building, structure or service sys- 
tem shall be notified in writing, as soon as practicable there- 
after. 

108.7.3 Connection after order to disconnect. A person 
shall not make energy source connections to installations 
regulated by this code which have been disconnected or 
ordered to be disconnected by the code official, or the use of 
which has been ordered to be discontinued by the code offi- 
cial until the code official authorizes the reconnection and 
use of such installations. 

When an installation is maintained in violation of this 
code, and in violation of a notice issued pursuant to the pro- 
visions of this section, the code official shall institute appro- 
priate action to prevent, restrain, correct or abate the 
violation. 



SECTION 109 (IFGC) 
MEANS OF APPEAL 

109.1 Application for appeal. A person shall have the right to 
appeal a decision of the code official to the board of appeals. 
An application for appeal shall be based on a claim that the true 
intent of this code or the rules legally adopted thereunder have 
been incorrectly interpreted, the provisions of this code do not 
fully apply or an equally good or better form of construction is 



2006 INTERNATIONAL FUEL GAS CODE® 



ADMINISTRATION 



proposed. The application shall be filed on a form obtained 
from the code official within 20 days after the notice was 
served. 

109.2 Membership of board. The board of appeals shall con- 
sist of five members appointed by the chief appointing author- 
ity as follows: one for five years; one for four years; one for 
three years; one for two years and one for one year. Thereafter, 
each new member shall serve for five years or until a successor 
has been appointed. 

109.2.1 Qualifications. The board of appeals shall consist 
of five individuals, one from each of the following profes- 
sions or disciplines. 

1. Registered design professional who is a registered 
architect; or a builder or superintendent of building 
construction with at least 10 years' experience, five of 
which shall have been in responsible charge of work. 

2. Registered design professional with structural engi- 
neering or architectural experience. 

3. Registered design professional with fuel gas and 
plumbing engineering experience; or a fuel gas con- 
tractor with at least 10 years' experience, five of 
which shall have been in responsible charge of work. 

4. Registered design professional with electrical engi- 
neering experience; or an electrical contractor with at 
least 10 years' experience, five of which shall have 
been in responsible charge of work. 

5. Registered design professional with fire protection 
engineering experience; or a fire protection contrac- 
tor with at least 10 years' experience, five of which 
shall have been in responsible charge of work. 

109.2.2 Alternate members. The chief appointing author- 
ity shall appoint two alternate members who shall be called 
by the board chairman to hear appeals during the absence or 
disqualification of a member. Alternate members shall pos- 
sess the qualifications required for board membership and 
shall be appointed for five years, or until a successor has 
been appointed. 

109.2.3 Chairman. The board shall annually select one of 
its members to serve as chairman. 

109.2.4 Disqualification of member. A member shall not 
hear an appeal in which that member has a personal, profes- 
sional or financial interest. 

109.2.5 Secretary. The chief administrative officer shall 
designate a qualified clerk to serve as secretary to the board. 
The secretary shall file a detailed record of all proceedings 
in the office of the chief administrative officer. 

109.2.6 Compensation of members. Compensation of 
members shall be determined by law. 

109.3 Notice of meeting. The board shall meet upon notice 
from the chairman, within 10 days of the filing of an appeal, or 
at stated periodic meetings. 

109.4 Open hearing. All hearings before the board shall be 
open to the public. The appellant, the appellant's representa- 
tive, the code official and any person whose interests are 
affected shall be given an opportunity to be heard. 



109.4.1 Procedure. The board shall adopt and make avail- 
able to the public through the secretary procedures under 
which a hearing will be conducted. The procedures shall not 
require compliance with strict rules of evidence, but shall 
mandate that only relevant information be received. 

109.5 Postponed hearing. When five members are not present 
to hear an appeal, either the appellant or the appellant's repre- 
sentative shall have the right to request a postponement of the 
hearing. 

109.6 Board decision. The board shall modify or reverse the 
decision of the code official by a concurring vote of three mem- 
bers. 

109.6.1 Resolution. The decision of the board shall be by 
resolution. Certified copies shall be furnished to the appel- 
lant and to the code official. 

109.6.2 Administration. The code official shall take imme- 
diate action in accordance with the decision of the board. 

109.7 Court review. Any person, whether or not a previous 
party to the appeal, shall have the right to apply to the appropri- 
ate court for a writ of certiorari to correct errors of law. Appli- 
cation for review shall be made in the manner and time required 
by law following the filing of the decision in the office of the 
chief administrative officer. 



2006 INTERNATIONAL FUEL GAS CODE*" 



2006 INTERNATIONAL FUEL GAS CODE'' 



CHAPTER 2 

DEFINITIONS 



SECTION 201 (IFGC) 
GENERAL 

201.1 Scope. Unless otherwise expressly stated, the following 
words and terms shall, for the purposes of this code and stan- 
dard, have the meanings indicated in this chapter. 

201.2 Interchangeability. Words used in the present tense 
include the future; words in the masculine gender include the 
feminine and neuter; the singular number includes the plural 
and the plural, the singular. 

201.3 Terms defined in other codes. Where terms are not 
defined in this code and are defined in the ICC Electrical Code, 
International Building Code, International Fire Code, Interna- 
tional Mechanical Code or International Plumbing Code, such 
terms shall have meanings ascribed to them as in those codes. 

201.4 Terms not defined. Where terms are not defined 
through the methods authorized by this section, such terms 
shall have ordinarily accepted meanings such as the context 
implies. 



SECTION 202 (IFGC) 
GENERAL DEFINITIONS 

ACCESS (TO). That which enables a device, appliance or 
equipment to be reached by ready access or by a means that first 
requires the removal or movement of a panel, door or similar 
obstruction (see also "Ready access"). 

AIR CONDITIONER, GAS-FIRED. A gas-burning, auto- 
matically operated appliance for supplying cooled and/or 
dehumidified air or chilled liquid. 

AIR CONDITIONING. The treatment of air so as to control 
simultaneously the temperature, humidity, cleanness and dis- 
tribution of the air to meet the requirements of a conditioned 
space. 

AIR, EXHAUST. Air being removed from any space or piece 
of equipment and conveyed directly to the atmosphere by 
means of openings or ducts. 

AIR-HANDLING UNIT. A blower or fan used for the pur- 
pose of distributing supply air to a room, space or area. 

AIR, MAKEUP. Air that is provided to replace air being 
exhausted. 

ALTERATION. A change in a system that involves an exten- 
sion, addition or change to the arrangement, type or purpose of 
the original installation. 

ANODELESS RISER. A transition assembly in which plastic 
piping is installed and terminated above ground outside of a 
building. 

APPLIANCE (EQUIPMENT). Any apparatus or equipment 
that utilizes gas as a fuel or raw material to produce light, heat, 
power, refrigeration or air conditioning. 



APPLIANCE, FAN-ASSISTED COMBUSTION. An appU 
ance equipped with an integral mechanical means to either 
draw or force products of combustion through the combustion 
chamber or heat exchanger. 

APPLIANCE, AUTOMATICALLY CONTROLLED. 

Appliances equipped with an automatic burner ignition and 
safety shutoff device and other automatic devices which 
accomplish complete turn-on and shutoff of the gas to the main 
burner or burners, and graduate the gas supply to the burner or 
burners, but do not affect complete shutoff of the gas. 

APPLIANCE TYPE. 

Low-heat appliance (residential appliance). Any appli- 
ance in which the products of combustion at the point of 
entrance to the flue under normal operating conditions have 
a temperature of 1,000°F (538°C) or less. 

Medimn-heat appliance. Any appliance in which the prod- 
ucts of combustion at the point of entrance to the flue under 
normal operating conditions have a temperature of more than 
1,000°F (538°C), but not greater than 2,000°F (1093°C). 

APPLIANCE, UNVENTED. An appliance designed or 
installed in such a manner that the products of combustion are not 
conveyed by a vent or chimney directly to the outside atmosphere. 

APPLIANCE, VENTED. An appliance designed and 
installed in such a manner that all of the products of combus- 
tion are conveyed directly from the appliance to the outside 
atmosphere through an approved chimney or vent system. 

APPROVED. Acceptable to the code official or other author- 
ity having jurisdiction. 

APPROVED AGENCY. An established and recognized 
agency that is approved by the code official and regularly 
engaged in conducting tests or furnishing inspection services. 

ATMOSPHERIC PRESSURE. The pressure of the weight of 
air and water vapor on the surface of the earth, approximately 
14.7 pounds per square inch (psi) (101 kPa absolute) at sea 
level. 

AUTOMATIC IGNITION. Ignition of gas at the bumer(s) 
when the gas controlling device is turned on, including 
reignition if the flames on the bumer(s) have been extinguished 
by means other than by the closing of the gas controlling 
device. 

BAFFLE. An object placed in an appliance to change the 
direction of or retard the flow of air, air-gas mixtures or flue 
gases. 

BAROMETRIC DRAFT REGULATOR. A balanced 
damper device attached to a chimney, vent connector, breech- 
ing or flue gas manifold to protect combustion equipment by 
controlling chimney draft. A double-acting barometric draft 
regulator is one whose balancing damper is free to move in 
either direction to protect combustion equipment from both 
excessive draft and backdraft. 



2006 INTERNATIONAL FUEL GAS CODE*^ 



DEFINITIONS 



BOILER, LOW-PRESSURE. A self-contained appliance for 
supplying steam or hot water. 

Hot water heating boiler. A boiler in which no steam is 
generated, from which hot water is circulated for heating 
purposes and then returned to the boiler, and that operates at 
water pressures not exceeding 160 pounds per square inch 
gauge (psig) (1100 kPa gauge) and at water temperatures 
not exceeding 250°F (121°C) at or near the boiler outlet. 

Hot water supply boiler. A boiler, completely filled with 
water, which furnishes hot water to be used externally to 
itself, and that operates at water pressures not exceeding 1 60 
psig (1100 kPa gauge) and at water temperatures not 
exceeding 250°F (121°C) at or near the boiler outlet. 

Steam heating boiler. A boiler in which steam is generated 
and that operates at a steam pressure not exceeding 15 psig 
(100 kPa gauge). 

BRAZING. A metal-joining process wherein coalescence is 
produced by the use of a nonferrous filler metal having a melt- 
ing point above 1,000°F (538°C), but lower than that of the 
base metal being joined. The filler material is distributed 
between the closely fitted surfaces of the joint by capillary 
action. 

BROILER. A general term including salamanders, barbecues 
and other appliances cooking primarily by radiated heat, 
excepting toasters. 

BTU. Abbreviation for British thermal unit, which is the quan- 
tity of heat required to raise the temperature of 1 pound (454 g) 
of water 1°F (0.56°C) (1 Btu = 1055 J). 

BURNER. A device for the final conveyance of the gas, or a 
mixture of gas and air, to the combustion zone. 

Induced-draft. A burner that depends on draft induced by a 
fan that is an integral part of the appliance and is located 
downstream from the burner. 

Power. A burner in which gas, air or both are supplied at 
pressures exceeding, for gas, the line pressure, and for air, 
atmospheric pressure, with this added pressure being 
applied at the burner. 

CHIMNEY. A primarily vertical structure containing one or 
more flues, for the purpose of carrying gaseous products of 
combustion and air from an appliance to the outside atmo- 
sphere. 

Factory-built chimney. A listed and labeled chimney com- 
posed of factory-made components, assembled in the field 
in accordance with manufacturer's instructions and the con- 
ditions of the hsting. 

Masonry chimney. A field-constructed chimney composed 
of solid masonry units, bricks, stones or concrete. 

Metal chimney. A field-constructed chimney of metal. 

CLEARANCE. The minimum distance through air measured 
between the heat-producing surface of the mechanical appli- 
ance, device or equipment and the surface of the combustible 
material or assembly. 

CLOTHES DRYER. An appliance used to dry wet laundry by 
means of heated air. Dryer classifications are as follows: 



Type 1. Factory-built package, multiple production. Pri- 
marily used in family living environment. Usually the 
smallest unit physically and in function output. 

Type 2. Factory-built package, multiple production. Used in 
business with direct intercourse of the function with the 
public. Not designed for use in individual family living 
environment. 

CODE. These regulations, subsequent amendments thereto or 
any emergency rule or regulation that the administrative 
authority having jurisdiction has lawfully adopted. 

CODE OFFICIAL. The officer or other designated authority 
charged with the administration and enforcement of this code, 
or a duly authorized representative. 

COMBUSTION. In the context of this code, refers to the rapid 
oxidation of fuel accompanied by the production of heat or heat 
and light. 

COMBUSTION AIR. Air necessary for complete combus- 
tion of a fuel, including theoretical air and excess air. 

COMBUSTION CHAMBER. The portion of an appUance 
within which combustion occurs. 

COMBUSTION PRODUCTS. Constituents resulting from 
the combustion of a fuel with the oxygen of the air, including 
inert gases, but excluding excess air. 

CONCEALED LOCATION. A location that cannot be 
accessed without damaging permanent parts of the building 
structure or finish surface. Spaces above, below or behind 
readily removable panels or doors shall not be considered as 
concealed. 

CONCEALED PIPING. Piping that is located in a concealed 
location (see "Concealed location"). 

CONDENSATE. The liquid that condenses from a gas 
(including flue gas) caused by a reduction in temperature or 
increase in pressure. 

CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe 
and fittings, semirigid metallic tubing and fittings or a listed 
and labeled device that connects an appliance to the gas piping 
system. 

CONNECTOR, CHIMNEY OR VENT. The pipe that con- I 
nects an appliance to a chimney or vent. | 

CONSTRUCTION DOCUMENTS. All of the written, 
graphic and pictorial documents prepared or assembled for 
describing the design, location and physical characteristics of 
the elements of the project necessary for obtaining a mechani- 
cal permit. 

CONTROL. A manual or automatic device designed to regu- 
late the gas, air, water or electrical supply to, or operation of, a 
mechanical system. 

CONVERSION BURNER. A unit consisting of a burner and 
its controls for installation in an appliance originally utilizing 
another fuel. 

COUNTER APPLIANCES. AppUances such as coffee brew- 
ers and coffee urns and any appurtenant water-heating equip- 
ment, food and dish warmers, hot plates, griddles, waffle 



10 



2006 INTERNATIONAL FUEL GAS CODE® 



DEFINITIONS 



bakers and other appliances designed for installation on or in a 
counter. 

CUBIC FOOT. The amount of gas that occupies 1 cubic foot 
(0.02832 m3) when at a temperature of 60°F (16°C), saturated 
with water vapor and under a pressure equivalent to that of 30 
inches of mercury (101 kPa). 

DAMPER. A manually or automatically controlled device to 
regulate draft or the rate of flow of air or combustion gases. 

DECORATIVE APPLIANCE, VENTED. A vented apph- 
ance wherein the primary function lies in the aesthetic effect of 
the flames. 

DECORATIVE APPLIANCES FOR INSTALLATION IN 
VENTED FIREPLACES. A vented appliance designed for 
installation within the fire chamber of a vented fireplace, 
wherein the primary function lies in the aesthetic effect of the 
flames. 

DEMAND. The maximum amount of gas input required per 
unit of time, usually expressed in cubic feet per hour, or Btu/h 
(lBtu/h = 0.2931 W). 

DESIGN FLOOD ELEVATION. The elevation of the 
"design flood," including wave height, relative to the datum 
specified on the community's legally designated flood hazard 
map. 

DILUTION AIR. Air that is introduced into a draft hood and 
is mixed with the flue gases. 

DIRECT- VENT APPLIANCES. Appliances that are con- 
structed and installed so that all air for combustion is derived 
directly from the outside atmosphere and all flue gases are dis- 
charged directly to the outside atmosphere. 

DRAFT. The pressure difference existing between the equip- 
ment or any component part and the atmosphere, that causes a 
continuous flow of air and products of combustion through the 
gas passages of the appliance to the atmosphere. 

Mechanical or induced draft. The pressure difference cre- 
ated by the action of a fan, blower or ejector, that is located 
between the appliance and the chimney or vent termination. 

Natural draft. The pressure difference created by a vent or 
chimney because of its height, and the temperature differ- 
ence between the flue gases and the atmosphere. 

DRAFT HOOD. A nonadjustable device built into an appli- 
ance, or made as part of the vent connector from an appliance, 
that is designed to (1) provide for ready escape of the flue gases 
from the appliance in the event of no draft, backdraft or stop- 
page beyond the draft hood, (2) prevent a backdraft from enter- 
ing the appliance, and (3) neutralize the effect of stack action of 
the chimney or gas vent upon operation of the appliance. 

DRAFT REGULATOR. A device that functions to maintain a 
desired draft in the appliance by automatically reducing the 
draft to the desired value. 

DRIP. The container placed at a low point in a system of piping 
to collect condensate and from which the condensate is remov- 
able. 



DRY GAS. A gas having a moisture and hydrocarbon dew 
point below any normal temperature to which the gas piping is 
exposed. 

DUCT FURNACE. A warm-air furnace normally installed in 
an air distribution duct to supply warm air for heating. This def- 
inition shall apply only to a warm-air heating appliance that 
depends for air circulation on a blower not furnished as part of 
the furnace. 

DUCT SYSTEM. A continuous passageway for the transmis- 
sion of air that, in addition to ducts, includes duct fittings, 
dampers, plenums, fans and accessory air-handling equipment. 

DWELLING UNIT. A single unit providing complete, inde- 
pendent living facilities for one or more persons, including per- 
manent provisions for living, sleeping, eating, cooking and 
sanitation. 

EQUIPMENT. See "AppUance." 

FIREPLACE. A fire chamber and hearth constructed of 
noncombustible material for use with solid fuels and provided 
with a chimney. 

Masonry fireplace. A hearth and fire chamber of solid 
masonry units such as bricks, stones, listed masonry units or 
reinforced concrete, provided with a suitable chimney. 

Factory-built fireplace. A fireplace composed of listed 
factory-built components assembled in accordance with the 
terms of listing to form the completed fireplace. 

FIRING VALVE. A valve of the plug and barrel type designed 
for use with gas, and equipped with a lever handle for manual 
operation and a dial to indicate the percentage of opening. 

FLAME SAFEGUARD. A device that will automatically shut 
off the fuel supply to a main burner or group of burners when 
the means of ignition of such burners becomes inoperative, and 
when flame failure occurs on the burner or group of burners. 

FLOOD HAZARD AREA. The greater of the following two 
areas: 

1. The area within a floodplain subject to a 1 percent or 
greater chance of flooding in any given year. 

2. This area designated as a flood hazard area on a conmiu- 
nity 's flood hazard map, or otherwise legally designated. 

FLOOR FURNACE. A completely self-contained furnace 
suspended from the floor of the space being heated, taking air 
for combustion from outside such space and with means for 
observing flames and lighting the appliance from such space. 

Gravity type. A floor furnace depending primarily upon 
circulation of air by gravity. This classification shall also 
include floor furnaces equipped with booster-type fans 
which do not materially restrict free circulation of air by 
gravity flow when such fans are not in operation. 

Fan type. A floor furnace equipped with a fan which pro- 
vides the primary means for circulating air. 

FLUE, APPLIANCE. The passage(s) within an appliance 
through which combustion products pass from the combustion 
chamber of the appliance to the draft hood inlet opening on an 
appliance equipped with a draft hood or to the outlet of the 
appliance on an appliance not equipped with a draft hood. 



2006 INTERNATIONAL FUEL GAS CODE® 



11 



DEFINITIONS 



FLUE COLLAR. That portion of an appliance designed for 
the attachment of a draft hood, vent connector or venting sys- 
tem. 

FLUE GASES. Products of combustion plus excess air in 
apphance flues or heat exchangers. 

FLUE LINER (LINING). A system or material used to form 
the inside surface of a flue in a chimney or vent, for the purpose 
of protecting the surrounding structure from the effects of com- 
bustion products and for conveying combustion products with- 
out leakage to the atmosphere. 

FUEL GAS. A natural gas, manufactured gas, liquefied petro- 
I leum gas or mixtures of these gases. 

FUEL GAS UTILIZATION EQUIPMENT. See "Appli 
ance." 

FURNACE. A completely self-contained heating unit that is 
designed to supply heated air to spaces remote from or adjacent 
to the appliance location. 

FURNACE, CENTRAL. A self-contained apphance for heat- 
ing air by transfer of heat of combustion through metal to the 
air, and designed to supply heated air through ducts to spaces 
remote from or adjacent to the appliance location. 

Downflow furnace. A furnace designed with airflow dis- 
charge vertically downward at or near the bottom of the fur- 
nace. 

Forced air furnace with cooling unit. A single-package 
unit, consisting of a gas-fired forced-air furnace of one of 
the types listed below combined with an electrically or fuel 
gas-powered summer air-conditioning system, contained in 
a common casing. 

Forced-air type. A central furnace equipped with a fan or 
blower which provides the primary means for circulation of 
air. 

Gravity furnace with booster fan. A furnace equipped 
with a booster fan that does not materially restrict free circu- 
lation of air by gravity flow when the fan is not in operation. 

Gravity type. A central furnace depending primarily on cir- 
culation of air by gravity. 

Horizontal forced-air type. A furnace with airflow 
through the appliance essentially in a horizontal path. 

Multiple-position furnace. A furnace designed so that it 
can be installed with the airflow discharge in the upflow, 
horizontal or downflow direction. 

Upflow furnace. A furnace designed with airflow dis- 
charge vertically upward at or near the top of the furnace. 
This classification includes "highboy" furnaces with the 
blower mounted below the heating element and "lowboy" 
furnaces with the blower mounted beside the heating ele- 
ment. 

FURNACE, ENCLOSED. A specific heating, or heating and 
ventilating, furnace incorporating an integral total enclosure 
and using only outside air for combustion. 

FURNACE PLENUM. An air compartment or chamber to 
which one or more ducts are connected and which forms part of 
an air distribution system. 



GAS CONVENIENCE OUTLET. A permanently mounted, 
manually operated device that provides the means for connect- 
ing an appliance to, and disconnecting an appliance from, the 
supply piping. The device includes an integral, manually oper- 
ated valve with a nondisplaceable valve member and is 
designed so that disconnection of an appliance only occurs 
when the manually operated valve is in the closed position. 

GASEOUS HYDROGEN SYSTEM. See Section 702.1. 

GAS PIPING. An installation of pipe, valves or fittings 
installed on a premises or in a building and utilized to convey 
fuel gas. 

GAS UTILIZATION EQUIPMENT. An appliance that uti- 
lizes gas as a fuel or raw material or both. 

HAZARDOUS LOCATION. Any location considered to be a 
fire hazard for flammable vapors, dust, combustible fibers or 
other highly combustible substances. The location is not neces- 
sarily categorized in the building code as a high-hazard group 
classification. 

HOUSE PIPING. See "Piping system." 

HYDROGEN CUT-OFF ROOM. See Section 702.1. 

HYDROGEN GENERATING APPLIANCE. See Section 
702.1. 

IGNITION PILOT. A pilot that operates during the lighting 
cycle and discontinues during main burner operation. 

IGNITION SOURCE. A flame, spark or hot surface capable 
of igniting flammable vapors or fumes. Such sources include 
appliance burners, burner igniters, and electrical switching 
devices. 

INCINERATOR. An appliance used to reduce combustible 
refuse material to ashes and which is manufactured, sold and 
installed as a complete unit. 

INDUSTRIAL AIR HEATERS, DIRECT-FIRED 
NONRECIRCULATING. A heater in which all the products 
of combustion generated by the burners are released into the air 
stream being heated. The purpose of the heater is to offset 
building heat loss by heating only outdoor air. 

INDUSTRIAL AIR HEATERS, DIRECT-FIRED RECIR- 
CULATING. A heater in which all the products of combustion 
generated by the burners are released into the air stream being 
heated. The purpose of the heater is to offset building heat loss 
by heating outdoor air, and, if applicable, indoor air. 

INFRARED RADIANT HEATER. A heater that dkects a 
substantial amount of its energy output in the form of infrared 
radiant energy into the area to be heated. Such heaters are of 
either the vented or unvented type. 

JOINT, FLANGED. A joint made by bolting together a pair of 
flanged ends. 

JOINT, FLARED. A metal-to-metal compression joint in 
which a conical spread is made on the end of a tube that is com- 
pressed by a flare nut against a mating flare. 

JOINT, MECHANICAL. A general form of gas-tight joints 
obtained by the joining of metal parts through a positive-hold- 
ing mechanical construction, such as flanged joint, threaded 
joint, flared joint or compression joint. 



12 



2006 INTERNATIONAL FUEL GAS CODE<^ 



DEFINITIONS 



JOINT, PLASTIC ADHESIVE. A joint made in thermoset 
plastic piping by the use of an adhesive substance which forms 
a continuous bond between the mating surfaces without dis- 
solving either one of them. 

JOINT, PLASTIC HEAT FUSION. A joint made in thermo 
plastic piping by heating the parts sufficiently to permit fusion 
of the materials when the parts are pressed together. 

JOINT, WELDED. A gas-tight joint obtained by the joining 
of metal parts in molten state. 

LABELED. Devices, equipment, appliances or materials to 
which have been affixed a label, seal, symbol or other identify- 
ing mark of a nationally recognized testing laboratory, inspec- 
tion agency or other organization concerned with product 
evaluation that maintains periodic inspection of the production 
of the above-labeled items and by whose label the manufac- 
turer attests to compliance with applicable nationally recog- 
nized standards. 

LIMIT CONTROL. A device responsive to changes in pres- 
sure, temperature or level for turning on, shutting off or throt- 
tling the gas supply to an appliance. 

LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). Liq 

uefied petroleum gas composed predominately of propane, 
propylene, butanes orbutylenes, or mixtures thereof that is gas- 
eous under normal atmospheric conditions, but is capable of 
being liquefied under moderate pressure at normal tempera- 
tures. 

LISTED. Equipment, appliances or materials included in a list 
published by a nationally recognized testing laboratory, 
inspection agency or other organization concerned with prod- 
uct evaluation that maintains periodic inspection of production 
of listed equipment, appliances or materials, and whose listing 
states either that the equipment, appliance or material meets 
nationally recognized standards or has been tested and found 
suitable for use in a specified manner. The means for identify- 
ing listed equipment, appliances or materials may vary for each 
testing laboratory, inspection agency or other organization 
concerned with product evaluation, some of which do not rec- 
ognize equipment, appliances or materials as listed unless they 
are also labeled. The authority having jurisdiction shall utilize 
the system employed by the listing organization to identify a 
listed product. 

LIVING SPACE. Space within a dwelling unit utilized for liv- 
ing, sleeping, eating, cooking, bathing, washing and sanitation 
purposes. 

LOG LIGHTER. A manually operated solid fuel ignition 
appliance for installation in a vented solid fuel-burning fire- 
place. 

LUBRICATED PLUG-TYPE VALVE. A valve of the plug 
and barrel type provided with means for maintaining a lubri- 
cant between the bearing surfaces. 

MAIN BURNER. A device or group of devices essentially 
forming an integral unit for the final conveyance of gas or a 
mixture of gas and air to the combustion zone, and on which 
combustion takes place to accomplish the function for which 
the appliance is designed. 



METER. The instrument installed to measure the volume of 
gas delivered through it. 

MODULATING. Modulating or throttling is the action of a 
control from its maximum to minimum position in either pre- 
determined steps or increments of movement as caused by its 
actuating medium. 

OCCUPANCY. The purpose for which a building, or portion 
thereof, is utilized or occupied. 

OFFSET (VENT). A combination of approved bends that 
makes two changes in direction bringing one section of the vent 
out of line but into a line parallel with the other section. 

ORIFICE. The opening in a cap, spud or other device whereby 
the flow of gas is limited and through which the gas is dis- 
charged to the burner. 

OUTLET. A threaded connection or bolted flange in a pipe 
system to which a gas-burning appliance is attached. 

OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM 
(ODS). A system designed to act to shut off the gas supply to 
the main and pilot burners if the oxygen in the surrounding 
atmosphere is reduced below a predetermined level. 

PILOT. A small flame that is utilized to ignite the gas at the 
main burner or burners. 

PIPING. Where used in this code, "piping" refers to either 
pipe or tubing, or both. 

Pipe. A rigid conduit of iron, steel, copper, brass or plastic. 

Tlibing. Semirigid conduit of copper, aluminum, plastic or 
steel. 

PIPING SYSTEM. All fuel piping, valves and fittings from 
the outlet of the point of delivery to the outlets of the equipment 
shutoff valves. 

PLASTIC, THERMOPLASTIC. A plastic that is capable of 
being repeatedly softened by increase of temperature and hard- 
ened by decrease of temperature. 

POINT OF DELIVERY. For natural gas systems, the point of 
delivery is the outlet of the service meter assembly or the outlet 
of the service regulator or service shutoff valve where a meter 
is not provided. Where a valve is provided at the outlet of the 
service meter assembly, such valve shall be considered to be 
downstream of the point of delivery. For undiluted liquefied 
petroleum gas systems, the point of delivery shall be consid- 
ered to be the outlet of the first regulator that reduces pressure 
to 2 psig (13.8 kPag) or less. 

PORTABLE FUEL CELL APPLIANCE. A fuel cell gener- 
ator of electricity, which is not fixed in place. A portable fuel 
cell appliance utilizes a cord and plug connection to a grid-iso- 
lated load and has an integral fuel supply. 

PRESSURE DROP. The loss in pressure due to friction or 
obstruction in pipes, valves, fittings, regulators and burners. 

PRESSURE TEST. An operation performed to verify tiie 
gas-tight integrity of gas piping following its installation or 
modification. 

PURGE. To free a gas conduit of air or gas, or a mixture of gas 
and air. 



2006 INTERNATIONAL FUEL GAS CODE® 



13 



DEFINITIONS 



QUICK-DISCONNECT DEVICE. A hand-operated device 
that provides a means for connecting and disconnecting an 
appliance or an appliance connector to a gas supply and that is 
equipped with an automatic means to shut off the gas supply 
when the device is disconnected. 

READY ACCESS (TO). That which enables a device, appli- 
ance or equipment to be directly reached, without requiring the 
removal or movement of any panel, door or similar obstruction 
(see "Access"). 

REGISTERED DESIGN PROFESSIONAL. An individual 
who is registered or licensed to practice their respective design 
profession as defined by the statutory requirements of the pro- 
fessional registration laws of the state or jurisdiction in which 
the project is to be constructed. 

REGULATOR. A device for controlling and maintaining a 
uniform supply pressure, either pounds-to-inches water col- 
umn (MP regulator) or inches-to-inches water column (appli- 
ance regulator). 

REGULATOR, GAS APPLIANCE. A pressure regulator for 
controlling pressure to the manifold of equipment. Types of 
appliance regulators are as follows: 

Adjustable. 

1 . Spring type, limited adjustment. A regulator in which 
the regulating force acting upon the diaphragm is 
derived principally from a spring, the loading of 
which is adjustable over a range of not more than 15 
percent of the outlet pressure at the midpoint of the 
adjustment range. 

2. Spring type, standard adjustment. A regulator in 
which the regulating force acting upon the diaphragm 
is derived principally from a spring, the loading of 
which is adjustable. The adjustment means shall be 
concealed. 

Multistage. A regulator for use with a single gas whose 
adjustment means is capable of being positioned manually 
or automatically to two or more predetermined outlet pres- 
sure settings. Each of these settings shall be adjustable or 
nonadjustable. The regulator may modulate outlet pressures 
automatically between its maximum and minimum prede- 
termined outlet pressure settings. 

Nonadjustable. 

1. Spring type, nonadjustable. A regulator in which the 
regulating force acting upon the diaphragm is derived 
principally from a spring, the loading of which is not 
field adjustable. 

2. Weight type. A regulator in which the regulating force 
acting upon the diaphragm is derived from a weight or 
combination of weights. 

REGULATOR, LINE GAS PRESSURE. A device placed in 
a gas line between the service pressure regulator and the equip- 
ment for controlling, maintaining or reducing the pressure in 
that portion of the piping system downstream of the device. 

(REGULATOR, MEDIUM-PRESSURE (MP Regulator). 
A line pressure regulator that reduces gas pressure from the 



range of greater than 0.5 psig (3 .4 kPa) and less than or equal to I 
5 psig (34.5 kPa) to a lower pressure. I 

REGULATOR, PRESSURE. A device placed in a gas hne for 

reducing, controlling and maintaining the pressure in that por- 
tion of the piping system downstream of the device. 

REGULATOR, SERVICE PRESSURE. A device installed 
by the serving gas supplier to reduce and limit the service line 
pressure to delivery pressure. 

RELIEF OPENING. The opening provided in a draft hood to 
permit the ready escape to the atmosphere of the flue products 
from the draft hood in the event of no draft, back draft, or stop- 
page beyond the draft hood, and to permit air into the draft hood 
in the event of a strong chimney updraft. 

RELIEF VALVE (DEVICE). A safety valve designed to fore- 
stall the development of a dangerous condition by relieving 
either pressure, temperature or vacuum in the hot water supply 
system. 

RELIEF VALVE, PRESSURE. An automatic valve that 
opens and closes a relief vent, depending on whether the pres- 
sure is above or below a predetermined value. 

RELIEF VALVE, TEMPERATURE. 

Reseating or self-closing type. An automatic valve that 
opens and closes a relief vent, depending on whether the 
temperature is above or below a predetermined value. 

Manual reset type. A valve that automatically opens a 
relief vent at a predetermined temperature and that must be 
manually returned to the closed position. 

RELIEF VALVE, VACUUM. A valve that automatically 
opens and closes a vent for relieving a vacuum within the hot 
water supply system, depending on whether the vacuum is 
above or below a predetermined value. 

RISER, GAS. A vertical pipe supplying fuel gas. 

ROOM HEATER, UNVENTED. See "Unvented room 
heater." 

ROOM HEATER, VENTED. A free-standing heating unit 
used for direct heating of the space in and adjacent to that in 
which the unit is located (see also "Vented room heater"). 

ROOM LARGE IN COMPARISON WITH SIZE OF 
EQUIPMENT. Rooms having a volume equal to at least 12 
times the total volume of a furnace or air-conditioning appli- 
ance and at least 1 6 times the total volume of a boiler. Total vol- 
ume of the appliance is determined from exterior dimensions 
and is to include fan compartments and burner vestibules, when 
used. When the actual ceiling height of a room is greater than 8 
feet (2438 mm), the volume of the room is figured on the basis 
of a ceiling height of 8 feet (2438 mm). 

SAFETY SHUTOFF DEVICE. See "Flame safeguard." 

SHAFT. An enclosed space extending through one or more 
stories of a building, connecting vertical openings in succes- 
sive floors, or floors and the roof. 

SLEEPING UNIT. A room or space in which people sleep, I 
which can also include permanent provisions for living, eating I 
and either sanitation or kitchen facilities, but not both. Such I 



14 



2006 INTERNATIONAL FUEL GAS CODE® 



DEFINITIONS 



rooms and spaces that are also part of a dwelling unit are not 
sleeping units. 

SPECIFIC GRAVITY. As applied to gas, specific gravity is 
the ratio of the weight of a given volume to that of the same vol- 
ume of air, both measured under the same condition. 

STATIONARY FUEL CELL POWER PLANT. A self-con- 
tained package or factory-matched packages which constitute 
an automatically operated assembly of integrated systems for 
generating electrical energy and recoverable thermal energy 
that is permanently connected and fixed in place. 

THERMOSTAT. 

Electric switch type. A device that senses changes in tem- 
perature and controls electrically, by means of separate 
components, the flow of gas to the bumer(s) to maintain 
selected temperatures. 

Integral gas valve type. An automatic device, actuated by 
temperature changes, designed to control the gas supply to 
the bumer(s) in order to maintain temperatures between pre- 
determined limits, and in which the thermal actuating ele- 
ment is an integral part of the device. 

1. Graduating thermostat. A thermostat in which the 
motion of the valve is approximately in direct propor- 
tion to the effective motion of the thermal element 
induced by temperature change. 

2. Snap-acting thermostat. A thermostat in which the 
thermostatic valve travels instantly from the closed to 
the open position, and vice versa. 

TRANSITION FITTINGS, PLASTIC TO STEEL. An 

adapter for joining plastic pipe to steel pipe. The purpose of this 
fitting is to provide a permanent, pressure-tight connection 
between two materials which cannot be joined directly one to 
another. 

UNIT HEATER. 

High-static pressure type. A self-contained, automatically 
controlled, vented appliance having integral means for cir- 
culation of air against 0.2 inch (15 mm HjO) or greater static 
pressure. Such appliance is equipped with provisions for 
attaching an outlet air duct and, where the appliance is for 
indoor installation remote from the space to be heated, is 
also equipped with provisions for attaching an inlet air duct. 

Low-static pressure type. A self-contained, automatically 
controlled, vented appliance, intended for installation in the 
space to be heated without the use of ducts, having integral 
means for circulation of air. Such units are allowed to be 
equipped with louvers or face extensions made in accor- 
dance with the manufacturer's specifications. 

UNLISTED BOILER. A boiler not listed by a nationally rec- 
ognized testing agency. 

UNVENTED ROOM HEATER. An unvented heating appli- 
ance designed for stationary installation and utilized to provide 
comfort heating. Such appliances provide radiant heat or con- 
vection heat by gravity or fan circulation directly from the 
heater and do not utilize ducts. 



VALVE. A device used in piping to control the gas supply to 
any section of a system of piping or to an appliance. 

Automatic. An automatic or semiautomatic device consist- 
ing essentially of a valve and operator that control the gas 
supply to the bumer(s) during operation of an appliance. 
The operator shall be actuated by application of gas pressure 
on a flexible diaphragm, by electrical means, by mechanical 
means, or by other approved means. 

Automatic gas shutoff. A valve used in conjunction with an 
automatic gas shutoff device to shut off the gas supply to a 
water-heating system. It shall be constructed integrally with 
the gas shutoff device or shall be a separate assembly. 

Equipment shutoff. A valve located in the piping system, 
used to isolate individual equipment for purposes such as 
service or replacement. 

Individual main burner. A valve that controls the gas sup- 
ply to an individual main burner. 

Main burner control. A valve that controls the gas supply 
to the main burner manifold. 

Manual main gas-control. A manually operated valve in 
the gas line for the purpose of completely turning on or shut- 
ting off the gas supply to the appliance, except to pilot or 
pilots that are provided with independent shutoff. 

Manual reset. An automatic shutoff valve installed in the 
gas supply piping and set to shut off when unsafe conditions 
occur. The device remains closed until manually reopened. 

Service shutoff. A valve, installed by the serving gas sup- 
plier between the service meter or source of supply and the 
customer piping system, to shut off the entire piping system. 

VENT. A pipe or other conduit composed of factory-made 
components, containing a passageway for conveying combus- 
tion products and air to the atmosphere, listed and labeled for 
use with a specific type or class of appliance. 

Special gas vent. A vent listed and labeled for use with 
listed Category 11, III and IV appliances. 

Type B vent. A vent listed and labeled for use with appli- 
ances with draft hoods and other Category I appliances that 
are listed for use with Type B vents. 

Type BW vent. A vent listed and labeled for use with wall 
furnaces. 

Type L vent. A vent hsted and labeled for use with appli- 
ances that are listed for use with Type L or Type B vents. 

VENT CONNECTOR. See "Connector." 

VENT GASES. Products of combustion from appliances plus 
excess air plus dilution air in the vent connector, gas vent or 
chimney above the draft hood or draft regulator. 

VENT PIPING 

Breather. Piping run from a pressure-regulating device to 
the outdoors, designed to provide a reference to atmo- 
spheric pressure. If the device incorporates an integral pres- 



2006 INTERNATIONAL FUEL GAS CODE® 



15 



DEFINITIONS 



sure relief mechanism, a breather vent can also serve as a 
relief vent. 

Relief. Piping run from a pressure-regulating or pres- 
sure-limiting device to the outdoors, designed to provide for 
the safe venting of gas in the event of excessive pressure in 
the gas piping system. 

VENTED APPLIANCE CATEGORIES. Appliances that 
are categorized for the purpose of vent selection are classified 
into the following four categories: 

Category I. An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 

Category II. An appliance that operates with a nonpositive 
vent static pressure and with a vent gas temperature that is 
capable of causing excessive condensate production in the 
vent. 

Category III. An appliance that operates with a positive 
vent static pressure and with a vent gas temperature that 
avoids excessive condensate production in the vent. 

Category IV. An appliance that operates with a positive 
vent static pressure and with a vent gas temperature that is 
capable of causing excessive condensate production in the 
vent. 

VENTED ROOM HEATER. A vented self-contained, 
free-standing, nonrecessed appliance for furnishing warm air 
to the space in which it is installed, directly from the heater 
without duct connections. 

VENTED WALL FURNACE. A self-contained vented appli- 
ance complete with grilles or equivalent, designed for incorpo- 
ration in or permanent attachment to the structure of a building, 
mobile home or travel trailer, and furnishing heated air circu- 
lated by gravity or by a fan directly into the space to be heated 
through openings in the casing. This definition shall exclude 
floor furnaces, unit heaters and central furnaces as herein 
defined. 

VENTING SYSTEM. A continuous open passageway from 
the flue collar or draft hood of an appliance to the outside atmo- 
sphere for the purpose of removing flue or vent gases. A vent- 
ing system is usually composed of a vent or a chimney and vent 
connector, if used, assembled to form the open passageway. 

Mechanical draft venting system. A venting system 
designed to remove flue or vent gases by mechanical means, 
that consists of an induced draft portion under nonpositive 
static pressure or a forced draft portion under positive static 
pressure. 

Forced-draft venting system. A portion of a venting sys- 
tem using a fan or other mechanical means to cause the 
removal of flue or vent gases under positive static vent pres- 
sure. 

Induced draft venting system. A portion of a venting sys- 
tem using a fan or other mechanical means to cause the 
removal of flue or vent gases under nonpositive static vent 
pressure. 



Natural draft venting system. A venting system designed 
to remove flue or vent gases under nonpositive static vent 
pressure entirely by natural draft. ^ . 

WALL HEATER, UNVENTED-TYPE. A room heater of the 
type designed for insertion in or attachment to a wall or parti- 
tion. Such heater does not incorporate concealed venting 
arrangements in its construction and discharges all products of 
combustion through the front into the room being heated. 

WATER HEATER. Any heating appliance or equipment that 
heats potable water and supplies such water to the potable hot 
water distribution system. 



16 



2006 INTERNATIONAL FUEL GAS CODE^ 



CHAPTER 3 

GENERAL REGULATIONS 



SECTION 301 (IFGC) 
GENERAL 

301.1 Scope. This chapter shall govern the approval and instal- 
lation of all equipment and appliances that comprise parts of 
the installations regulated by this code in accordance with Sec- 
tion 101.2. 

301.1.1 Other fuels. The requirements for combustion and 
dilution air for gas-fired appliances shall be governed by 
Section 304. The requirements for combustion and dilution 
air for appliances operating with fuels other than fuel gas 
shall be regulated by the International Mechanical Code. 

301.2 Energy utilization. Heating, ventilating and air-condi- 
tioning systems of all structures shall be designed and installed 
for efficient utilization of energy in accordance with the Inter- 
national Energy Conservation Code. 

301.3 Listed and labeled. Appliances regulated by this code 
shall be listed and labeled for the application in which they are 
used unless otherwise approved in accordance with Section 
105. The approval of unlisted appliances in accordance with 
Section 105 shall be based upon approved engineering evalua- 
tion. 

301.4 Labeling. Labeling shall be in accordance with the pro- 
cedures set forth in Sections 301.4.1 through 301.4.2.3. 

301.4.1 Testing. An approved agency shall test a represen- 
tative sample of the appliances being labeled to the relevant 
standard or standards. The approved agency shall maintain a 
record of all of the tests performed. The record shall provide 
sufficient detail to verify compliance with the test standard. 

301.4.2 Inspection and identification. The approved 
agency shall periodically perform an inspection, which 
shall be in-plant if necessary, of the appliances to be labeled. 
The inspection shall verify that the labeled appliances are 
representative of the appliances tested. 

301.4.2.1 Independent. The agency to be approved shall 
be objective and competent. To confirm its objectivity, 
the agency shall disclose all possible conflicts of interest. 

301.4.2.2 Equipment. An approved agency shall have 
adequate equipment to perform all required tests. The 
equipment shall be periodically calibrated. 

301.4.2.3 Personnel. An approved agency shall employ 
experienced personnel educated in conducting, supervis- 
ing and evaluating tests. 

301.5 Label information. A permanent factory-applied name- 
plate(s) shall be affixed to apphances on which shall appear in 
legible lettering, the manufacturer's name or trademark, the 
model number, serial number and, for listed appliances, the 
seal or mark of the testing agency. A label shall also include the 
hourly rating in British thermal units per hour (Btu/h) (W); the 
type of fuel approved for use with the apphance; and the mini- 
mum clearance requirements. 



301.6 Plumbing connections. Potable water supply and build- 
ing drainage system connections to appliances regulated by 
this code shall be in accordance with the International Plumb- 
ing Code. 

301.7 Fuel types. Appliances shall be designed for use with the 
type of fuel gas that will be supplied to them. 

301.7.1 Appliance fuel conversion. Appliances shall not 
be converted to utilize a different fuel gas except where 
complete instructions for such conversion are provided in 
the installation instructions, by the serving gas supplier or 
by the appliance manufacturer. 

301.8 Vibration isolation. Where means for isolation of vibra- 
tion of an appliance is installed, an approved means for support 
and restraint of that appliance shall be provided. 

301.9 Repair. Defective material or parts shall be replaced or 
repaired in such a manner so as to preserve the original 
approval or listing. 

301.10 Wind resistance. Appliances and supports that are 
exposed to wind shall be designed and installed to resist the 
wind pressures determined in accordance with the Interna- 
tional Building Code. 

301.11 Flood hazard. For structures located in flood hazard 
areas, the appliance, equipment and system installations regu- 
lated by this code shall be located at or above the design flood 
elevation and shall comply with the flood-resistant construc- 
tion requirements of the International Building Code. 

Exception: The appliance, equipment and system installa- 
tions regulated by this code are permitted to be located 
below the design flood elevation provided that they are 
designed and installed to prevent water from entering or 
accumulating within the components and to resist hydro- 
static and hydrodynamic loads and stresses, including the 
effects of buoyancy, during the occurrence of flooding to the 
design flood elevation and shall comply with the 
flood-resistant construction requirements of the Interna- 
tional Building Code. 

301.12 Seismic resistance. When earthquake loads are appli- 
cable in accordance with the International Building Code, the 
supports shall be designed and installed for the seismic forces 
in accordance with that code. 

301.13 Ducts. All ducts required for the installation of systems 
regulated by this code shall be designed and installed in accor- 
dance with the International Mechanical Code. 

301.14 Rodentproofing. Buildings or structures and the walls 
enclosing habitable or occupiable rooms and spaces in which 
persons Hve, sleep or work, or in which feed, food or foodstuffs 
are stored, prepared, processed, served or sold, shall be con- 
structed to protect against rodents in accordance with the Inter- 
national Building Code. 



2006 INTERNATIONAL FUEL GAS CODE® 



17 



GENERAL REGULATIONS 



301.15 Prohibited location. The appliances, equipment and 
systems regulated by this code shall not be located in an eleva- 
tor shaft. 



SECTION 302 (IFGC) 
STRUCTURAL SAFETY 

[B] 302.1 Structural safety. The building shall not be weak- 
ened by the installation of any gas piping. In the process of 
installing or repairing any gas piping, the finished floors, walls, 
ceilings, tile work or any other part of the building or premises 
which is required to be changed or replaced shall be left in a 
safe structural condition in accordance with the requirements 
of the International Building Code. 

[B] 302.2 Penetrations of floor/ceiling assemblies and 
fire-resistance-rated assemblies. Penetrations of floor/ceil- 
ing assemblies and assemblies required to have a fire-resis- 
tance rating shall be protected in accordance with the 
International Building Code. 

[B] 302.3 Cutting, notching and boring in wood members. 

The cutting, notching and boring of wood members shall com- 
ply with Sections 302.3.1 through 302.3.4. 

[B] 302.3.1 Engineered wood products. Cuts, notches and 
holes bored in trusses, structural composite lumber, struc- 
tural glued-laminated members and I-joists are prohibited 
except where permitted by the manufacturer's recommen- 
dations or where the effects of such alterations are specifi- 
cally considered in the design of the member by a registered 
design professional. 

[B] 302.3.2 Joist notching and boring. Notching at the 
ends of joists shall not exceed one-fourth the joist depth. 
Holes bored in joists shall not be within 2 inches (5 1 mm) of 
the top and bottom of the joist and their diameter shall not 
exceed one-third the depth of the member. Notches in the 
top or bottom of the joist shall not exceed one-sixth the 
depth and shall not be located in the middle one-third of the 
span. 

[B] 302.3.3 Stud cutting and notching. In exterior walls 
and bearing partitions, any wood stud is permitted to be cut 
or notched to a depth not exceeding 25 percent of its width. 
Cutting or notching of studs to a depth not greater than 40 
percent of the width of the stud is permitted in 
nonload-bearing partitions supporting no loads other than 
the weight of the partition. 

[B] 302.3.4 Bored holes. A hole not greater in diameter than 
40 percent of the stud depth is permitted to be bored in any 
wood stud. Bored holes not greater than 60 percent of the 
depth of the stud are permitted in nonload-bearing partitions 
or in any wall where each bored stud is doubled, provided 
not more than two such successive doubled studs are so 
bored. In no case shall the edge of the bored hole be nearer 
than Vg inch (15.9 mm) to the edge of the stud. Bored holes 
shall not be located at the same section of a stud as a cut or 
notch. 

[B] 302.4 Alterations to trusses. Truss members and compo- 
nents shall not be cut, drilled, notched, spMced or otherwise 
altered in any way without the written concurrence and 



approval of a registered design professional. Alterations 
resulting in the addition of loads to any member (e.g., HVAC 
equipment, water heaters) shall not be permitted without verifi- 
cation that the truss is capable of supporting such additional 
loading. 

[B] 302.5 Cutting, notching and boring holes in structural 
steel framing. The cutting, notching and boring of holes in 
structural steel framing members shall be as prescribed by the 
registered design professional. 

[B] 302.6 Cutting, notching and boring holes in 
cold-formed steel framing. Flanges and lips of load-bearing, 
cold-formed steel framing members shall not be cut or notched. 
Holes in webs of load-bearing, cold-formed steel framing 
members shall be permitted along the centerline of the web of 
the framing member and shall not exceed the dimensional limi- 
tations, penetration spacing or minimum hole edge distance as 
prescribed by the registered design professional. Cutting, 
notching and boring holes of steel floor/roof decking shall be 
as prescribed by the registered design professional. 

[B] 302.7 Cutting, notching and boring holes in 
nonstructural cold-formed steel wall framing. Flanges and 
lips of nonstructural cold-formed steel wall studs shall be per- 
mitted along the centerline of the web of the framing member, 
shall not exceed 1 Vj inches (38 mm) in width or 4 inches (102 
mm) in length, and the holes shall not be spaced less than 24 
inches (610 mm) center to center from another hole or less than 
10 inches (254 nrni) from the bearing end. 



SECTION 303 (IFGC) 
APPLIANCE LOCATION 

303.1 General. Appliances shall be located as required by this 
section, specific requirements elsewhere in this code and the 
conditions of the equipment and appliance listing. 

303.2 Hazardous locations. Appliances shall not be located in 
a hazardous location unless listed and approved for the specific 
installation. 

303.3 Prohibited locations. Appliances shall not be located in 
sleeping rooms, bathrooms, toilet rooms, storage closets or sur- 
gical rooms, or in a space that opens only into such rooms or 
spaces, except where the installation complies with one of the 
following: 

1. The appliance is a direct- vent appliance installed in 
accordance with the conditions of the listing and the 
manufacturer's instructions. 

2. Vented room heaters, wall furnaces, vented decorative 
appliances, vented gas fireplaces, vented gas fireplace 
heaters and decorative appliances for installation in 
vented solid fuel-burning fireplaces are installed in 
rooms that meet the required volume criteria of Section 
304.5. 

3 . A single wall-mounted unvented room heater is installed 
in a bathroom and such unvented room heater is 
equipped as specified in Section 621.6 and has an input 
rating not greater than 6,000 Btu/h (1 .76 kW). The bath- 
room shall meet the required volume criteria of Section 
304.5. 



18 



2006 INTERNATIONAL FUEL GAS CODE® 



GENERAL REGULATIONS 



4. A single wall-mounted un vented room heater is installed 
in a bedroom and such un vented room heater is equipped 
as specified in Section 621.6 and has an input rating not 
greater than 10,000 Btu/h (2.93 kW). The bedroom shall 
meet the required volume criteria of Section 304.5. 

5. The appliance is installed in a room or space that opens 
only into a bedroom or bathroom, and such room or 
space is used for no other purpose and is provided with a 
solid weather-stripped door equipped with an approved 
self-closing device. All combustion air shall be taken 
directly from the outdoors in accordance with Section 
304.6. 



303.4 Protection from vehicle impact damage. Appliances 
shall not be installed in a location subject to vehicle impact 
damage except where protected by an approved means. 

303.5 Indoor locations. Furnaces and boilers installed in clos- 
ets and alcoves shall be listed for such installation. 

303.6 Outdoor locations. Equipment installed in outdoor loca- 
tions shaU be either hsted for outdoor installation or provided 
with protection from outdoor environmental factors that influ- 
ence the operability, durabiUty and safety of the equipment. 

303.7 Pit locations. Appliances installed in pits or excavations 
shall not come in direct contact with the surrounding soil. The 
sides of the pit or excavation shall be held back a minimum of 
12 inches (305 mm) from the appliance. Where the depth 
exceeds 12 inches (305 mm) below adjoining grade, the walls 
of the pit or excavation shall be lined with concrete or masonry, 
such concrete or masonry shall extend a minimum of 4 inches 
(102 mm) above adjoining grade and shall have sufficient lat- 
eral load-bearing capacity to resist collapse. The appliance 
shall be protected from flooding in an approved manner. 



SECTION 304 (IFGS) 
COMBUSTION, VENTILATION AND DILUTION AIR 

304.1 General. Air for combustion, ventilation and dilution of 
flue gases for appliances installed in buildings shall be pro- 
vided by application of one of the methods prescribed in Sec- 
tions 304.5 through 304.9. Where the requirements of Section 
304.5 are not met, outdoor air shall be introduced in accor- 
dance with one of the methods prescribed in Sections 304.6 
through 304.9. Direct- vent appliances, gas appliances of other 
than natural draft design and vented gas appliances other than 
Category I shall be provided with combustion, ventilation and 
dilution air in accordance with the appliance manufacturer's 
instructions. 

Exception: Type 1 clothes dryers that are provided with 
makeup air in accordance with Section 614.5. 

304.2 Appliance location. Appliances shall be located so as 
not to interfere with proper circulation of combustion, ventila- 
tion and dilution air. 

304.3 Draft hood/regulator location. Where used, a draft 
hood or a barometric draft regulator shall be installed in the 
same room or enclosure as the appliance served so as to prevent 
any difference in pressure between the hood or regulator and 
the combustion air supply. 



304.4 Makeup air provisions. Makeup air requirements for 
the operation of exhaust fans, kitchen ventilation systems, 
clothes dryers and fireplaces shall be considered in determin- 
ing the adequacy of a space to provide combustion air require- 
ments. 

304.5 Indoor combustion air. The required volume of indoor 
air shall be determined in accordance with Section 304.5.1 or 
304.5.2, except that where the air infiltration rate is known to 
be less than 0.40 air changes per hour (ACH), Section 304.5.2 
shall be used. The total required volume shall be the sum of the 
required volume calculated for all appliances located within 
the space. Rooms communicating directly with the space in 
which the appliances are installed through openings not fur- 
nished with doors, and through combustion air openings sized 
and located in accordance with Section 304.5.3, are considered 
to be part of the required volume. 

304.5.1 Standard method. The minimum required volume 
shall be 50 cubic feet per 1,000 Btu/h (4.8 m^/kW) of the 
appliance input rating. 

304.5.2 Known air-infiltration-rate method. Where the 
air infiltration rate of a structure is known, the minimum 
required volume shall be determined as follows: 

For appliances other than fan-assisted, calculate volume 
using Equation 3-1. 



Required Volumeo,her ^ 



ACH[l,OOOBtu/hr^ 

(Equation 3-1) 



For fan-assisted appliances, calculate volume using 
Equation 3-2. 



Required VolumCf, 



15/?^ 



r 



ACH 



fan 



1,000 Btu/hr 



(Equation 3-2) 

where: 

hther = All appliances other than fan assisted (input in 
Btu/h). 

Ifa„ = Fan-assisted appliance (input in Btu/h). 

ACH = Air change per hour (percent of volume of space 
exchanged per hour, expressed as a decimal). 

For purposes of this calculation, an infiltration rate 
greater than 0.60 ACH shall not be used in Equations 3-1 
and 3-2. 

304.5.3 Indoor opening size and location. Openings used 
to connect indoor spaces shall be sized and located in accor- 
dance with Sections 304.5.3.1 and 304.5.3.2 (see Figure 
304.5.3). 

304.5.3.1 Combining spaces on the same story. Each 
opening shall have a minimum free area of 1 square inch 
per 1,000 Btu/h (2,200 mm^/kW) of the total input rating 
of all appUances in the space, but not less than 1 00 square | 
inches (0.06 m^). One opening shall commence within 
12 inches (305 mm) of the top and one opening shall 
commence within 12 inches (305 mm) of the bottom of 



2006 INTERNATIONAL FUEL GAS CODE® 



19 



GENERAL REGULATIONS 



CHIMNEY OR GAS VENT 





I 



OPENING 



I I I I T 



- CHIMNEY OR GAS VENT 




VENTILATION LOUVERS 
(EACH END OF ATTIC) 



1 — T 



S 



I . I . I . Iljl 



X 



I I I 



1 



VENTILATION LOUVERS FOR 
UNHEATED CRAWL SPACE 



FIGURE 304.5.3 

ALL AIR FROM INSIDE THE BUILDING 

(see Section 304.5.3) 

the enclosure. The minimum dimension of air openings 
shall be not less than 3 inches (76 mm). 

304.5.3.2 Combining spaces in different stories. The 

volumes of spaces in different stories shall be considered 
as communicating spaces where such spaces are con- 
nected by one or more openings in doors or floors having 
a total minimum free area of 2 square inches per 1,000 
Btu/h (4402 mm^/kW) of total input rating of all appli- 
ances. 

304.6 Outdoor combustion air. Outdoor combustion air shall 
be provided through opemng(s) to the outdoors in accordance 
with Section 304.6.1 or 304.6.2. The minimum dimension of 
air openings shall be not less than 3 inches (76 mm). 

304.6.1 Two-permanent-openings method. Two perma- 
nent openings, one commencing within 12 inches (305 mm) 
of the top and one commencing within 12 inches (305 mm) 
of the bottom of the enclosure, shall be provided. The open- 
ings shall communicate directly, or by ducts, with the out- 
doors or spaces that freely communicate with the outdoors. 

Where directly communicating with the outdoors, or 
where communicating with the outdoors through vertical 
ducts, each opening shall have a minimum free area of 1 
square inch per 4,000 Btu/h (550 mm^/kW) of total input 
rating of all appliances in the enclosure [see Figures 
304.6.1(1) and 304.6.1(2)]. 

Where communicating with the outdoors through hori- 
zontal ducts, each opening shall have a minimum free area 
of not less than 1 square inch per 2,000 Btu/h (1,100 
mm^/kW) of total input rating of all appliances in the enclo- 
sure [see Figure 304.6.1(3)]. 



FIGURE 304.6.1(1) 

ALL AIR FROM OUTDOORS— INLET AIR FROM VENTILATED 

CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC 

(see Section 304.6.1) 



CHIMNEY OR GAS VENT 




VENTILATION LOUVERS 
(EACH END OF ATTIC) 



OUTLET AIR 



INLET AIR DUCT 

(ENDS 1 FOOT (305 MM) 

ABOVE FLOOR) 



cn; 



' I' l 'i' l 'l 



For SI: 1 foot = 304.8 mm. 

FIGURE 304.6.1(2) 

ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC 

(see Section 304.6.1) 



20 



2006 INTERNATIONAL FUEL GAS CODE"" 



GENERAL REGULATIONS 



CHIMNEY OR GAS VENT 



; OPENING 




ALTERNATE OPENING 
LOCATION 



-CHIMNEY OR GAS VENT 




FIGURE 304.6.2 

SINGLE COMBUSTION AIR OPENING, 

ALL AIR FROM THE OUTDOORS 

(see Section 304.6.2) 



FIGURE 304.6.1(3) 

ALL AIR FROM OUTDOORS 

(see Section 304.6.1) 



304.6.2 One-permanent-opening method. One perma- 
nent opening, commencing within 12 inches (305 mm) of 
the top of the enclosure, shall be provided. The appliance 
shall have clearances of at least 1 inch (25 mm) from the 
sides and back and 6 inches (152 mm) from the front of the 
appliance. The opening shall directly communicate with the 
outdoors or through a vertical or horizontal duct to the out- 
doors, or spaces that freely communicate with the outdoors 
(see Figure 304.6.2) and shall have a minimum free area of 1 
square inch per 3,000 Btu/h (734 mm^/kW) of the total input 
rating of all appliances located in the enclosure and not less 
than the sum of the areas of all vent connectors in the space. 

304.7 Combination indoor and outdoor combustion air. 

The use of a combination of indoor and outdoor combustion air 
shall be in accordance with Sections 304.7. 1 through 304.7.3. 

304.7.1 Indoor openings. Where used, openings connect- 
ing the interior spaces shall comply with Section 304.5.3. 

304.7.2 Outdoor opening location. Outdoor opening(s) 
shall be located in accordance with Section 304.6. 

304.7.3 Outdoor opemng(s) size. The outdoor opening(s) 
size shall be calculated in accordance with the following: 

1 . The ratio of interior spaces shall be the available vol- 
ume of all communicating spaces divided by the 
required volume. 

2. The outdoor size reduction factor shall be one minus 
the ratio of interior spaces. 

3. The minimum size of outdoor opening(s) shall be the 
full size of outdoor opening(s) calculated in accor- 
dance with Section 304.6, multiplied by the reduction 
factor. The minimum dimension of air openings shall 
be not less than 3 inches (76 mm). 



304.8 Engineered installations. Engineered combustion air 
installations shall provide an adequate supply of combustion, 
ventilation and dilution air and shall be approved. 

304.9 Mechanical combustion air supply. Where all combus- 
tion air is provided by a mechanical air supply system, the com- 
bustion air shall be supplied from the outdoors at a rate not less 
than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 mVmin 
per kW) of total input rating of all appliances located within the 
space. 

304.9.1 Makeup air. Where exhaust fans are installed, 
makeup air shall be provided to replace the exhausted air. 

304.9.2 Appliance interlock. Each of the appliances served 
shall be interlocked with the mechanical air supply system 
to prevent main burner operation when the mechanical air 
supply system is not in operation. 

304.9.3 Combined combustion air and ventilation air 
system. Where combustion air is provided by the building's 
mechanical ventilation system, the system shall provide the 
specified combustion air rate in addition to the required ven- 
tilation air. 

304.10 Louvers and grilles. The required size of openings for 
combustion, ventilation and dilution air shall be based on the 
net free area of each opening. Where the free area through a 
design of louver, grille or screen is known, it shall be used in 
calculating the size opening required to provide the free area 
specified. Where the design and free area of louvers and grilles 
are not known, it shall be assumed that wood louvers will have 
25-percent free area and metal louvers and grilles will have 
75-percent free area. Screens shall have a mesh size not smaller 
than V4 inch (6.4 mm). Nonmotorized louvers and grilles shall 
be fixed in the open position. Motorized louvers shall be inter- 
locked with the appliance so that they are proven to be in the 



2006 INTERNATIONAL FUEL GAS CODE*" 



21 



GENERAL REGULATIONS 



full open position prior to main burner ignition and during main 
burner operation. Means shall be provided to prevent the main 
burner from igniting if the louvers fail to open during burner 
start-up and to shut down the main burner if the louvers close 
during operation. 

304.11 Combustion air ducts. Combustion air ducts shall 
comply with all of the following: 

1 . Ducts shall be constructed of galvanized steel complying 
with Chapter 6 of the International Mechanical Code or 

I of a material having equivalent corrosion resistance, 

strength and rigidity. 

Exception: Within dwellings units, unobstructed 
stud and joist spaces shall not be prohibited from con- 
veying combustion air, provided that not more than 
one required fireblock is removed. 

2. Ducts shall terminate in an unobstructed space allowing 
free movement of combustion air to the appliances. 

3. Ducts shall serve a single enclosure. 

4. Ducts shall not serve both upper and lower combustion 
air openings where both such openings are used. The 
separation between ducts serving upper and lower com- 
bustion air openings shall be maintained to the source of 
combustion air. 

5. Ducts shall not be screened where terminating in an attic 
space. 

6. Horizontal upper combustion air ducts shall not slope 
downward toward the source of combustion air. 

7. The remaining space surrounding a chimney liner, gas 
vent, special gas vent or plastic piping installed within a 
masonry, metal or factory-built chimney shall not be 
used to supply combustion air. 

Exception: Direct-vent gas-fired appliances 
designed for installation in a solid fuel-burning fire- 

I place where installed in accordance with the manu- 

facturer's instructions. 

8. Combustion air intake openings located on the exterior 
of a building shall have the lowest side of such openings 
located not less than 12 inches (305 mm) vertically from 
the adjoining grade level. 

304.12 Protection from fumes and gases. Where corrosive or 
flammable process fumes or gases, other than products of com- 
bustion, are present, means for the disposal of such fumes or 
gases shall be provided. Such fumes or gases include carbon 
monoxide, hydrogen sulfide, ammonia, chlorine and 
halogenated hydrocarbons. 

In barbershops, beauty shops and other facilities where 
chemicals that generate corrosive or flammable products, such 
as aerosol sprays, are routinely used, nondirect vent-type appli- 
I ances shall be located in a mechanical room separated or parti- 
tioned off from other areas with provisions for combustion air 
and dilution air from the outdoors. Direct- vent appliances shall 
be installed in accordance with the appliance manufacturer's 
installation instructions. 



SECTION 305 (IFGC) 
INSTALLATION 

305.1 General. Equipment and appliances shall be installed as 
required by the terms of their approval, in accordance with the 
conditions of listing, the manufacturer's instructions and this 
code. Manufacturers' installation instructions shall be avail- 
able on the job site at the time of inspection. Where a code pro- 
vision is less restrictive than the conditions of the listing of the 
equipment or appliance or the manufacturer's installation 
instructions, the conditions of the listing and the manufac- 
turer's installation instructions shall apply. 

Unlisted appliances approved in accordance with Section 
301.3 shall be limited to uses recommended by the manufac- 
turer and shall be installed in accordance with the manufac- 
turer's instructions, the provisions of this code and the 
requirements determined by the code official. 

305.2 Hazardous area. Equipment and appliances having an 
ignition source shall not be installed in Group H occupancies or 
control areas where open use, handling or dispensing of com- 
bustible, flammable or explosive materials occurs. 

305.3 Elevation of ignition source. Equipment and appliances 
having an ignition source shall be elevated such that the source 
of ignition is not less than 18 inches (457 mm) above the floor 
in hazardous locations and public garages, private garages, 
repair garages, motor fuel-dispensing facilities and parking 
garages. For the purpose of this section, rooms or spaces that 
are not part of the living space of a dwelling unit and that com- 
municate directly with a private garage through openings shall 
be considered to be part of the private garage. 

Exception: Elevation of the ignition source is not required 
for appliances that are listed as flammable vapor ignition I 
resistant. 

305.3.1 Parking garages. Connection of a parking garage 
with any room in which there is a fuel-fired appliance shall 
be by means of a vestibule providing a two-doorway separa- 
tion, except that a single door is permitted where the sources 
of ignition in the appliance are elevated in accordance with 
Section 305.3. 

Exception: This section shall not apply to appliance 
installations complying with Section 305.4. 

305.4 Public garages. Appliances located in public garages, 
motor fuel-dispensing facilities, repair garages or other areas 
frequented by motor vehicles shall be installed a minimum of 8 
feet (2438 mm) above the floor. Where motor vehicles exceed 6 
feet (1829 mm) in height and are capable of passing under an 
appliance, appHances shall be installed a minimum of 2 feet 
(610 mm) higher above the floor than the height of the tallest 
vehicle. 



Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section 305.3 and 
NFPA 30A. I 



22 



2006 INTERNATIONAL FUEL GAS CODE^ 



GENERAL REGULATIONS 



305.5 Private garages. Appliances located in private garages 
shall be installed with a minimum clearance of 6 feet (1829 
mm) above the floor. 

Exception: The requirements of this section shall not apply 
where the appliances are protected from motor vehicle 
impact and installed in accordance with Section 305.3. 

305.6 Construction and protection. Boiler rooms and fur- 
nace rooms shall be protected as required by the International 
Building Code. 

305.7 Clearances from grade. Equipment and appliances 
installed at grade level shall be supported on a level concrete 
slab or other approved material extending above adjoining 
grade or shall be suspended a minimum of 6 inches (152 mm) 
above adjoining grade. 

305.8 Clearances to combustible construction. Heat-pro- 
ducing equipment and appliances shall be installed to maintain 
the required clearances to combustible construction as speci- 
fied in the listing and manufacturer's instructions. Such clear- 
ances shall be reduced only in accordance with Section 308. 
Clearances to combustibles shall include such considerations 
as door swing, drawer pull, overhead projections or shelving 
and window swing. Devices, such as door stops or limits and 
closers, shall not be used to provide the required clearances. 



SECTION 306 (IFGC) 
ACCESS AND SERVICE SPACE 

[M] 306.1 Clearances for maintenance and replacement. 

Clearances around appliances to elements of permanent con- 
struction, including other installed appliances, shall be suffi- 
cient to allow inspection, service, repair or replacement 
without removing such elements of permanent construction or 
disabling the function of a required fire-resistance-rated 
assembly. 

[M] 306.2 Appliances in rooms. Rooms containing appli- 
ances requiring access shall be provided with a door and an 
unobstructed passageway measuring not less than 36 inches 
(914 mm) wide and 80 inches (2032 mm) high. 

Exception: Within a dwelling unit, appliances installed in a 
compartment, alcove, basement or similar space shall be 
provided with access by an opening or door and an unob- 
structed passageway measuring not less than 24 inches (610 
mm) wide and large enough to allow removal of the largest 
appliance in the space, provided that a level service space of 
not less than 30 inches (762 mm) deep and the height of the 
appliance, but not less than 30 inches (762 mm), is present at 
the front or service side of the appliance with the door open. 

[M] 306.3 Appliances in attics. Attics containing appUances 
requiring access shall be provided with an opening and unob- 
structed passageway large enough to allow removal of the larg- 
est component of the appliance. The passageway shall not be 
less than 30 inches (762 mm) high and 22 inches (559 mm) 
wide and not more than 20 feet (6096 mm) in length when mea- 
sured along the centerline of the passageway from the opening 
to the equipment. The passageway shall have continuous solid 
flooring not less than 24 inches (610 mm) wide. A level service 
space not less than 30 inches (762 mm) deep and 30 inches (762 



mm) wide shall be present at the front or service side of the 
equipment. The clear access opening dimensions shall be a 
minimum of 20 inches by 30 inches (508 mm by 762 mm), 
where such dimensions are large enough to allow removal of 
the largest component of the appliance. 

Exceptions: 

1. The passageway and level service space are not 
required where the appliance is capable of being ser- 
viced and removed through the required opening. 

2. Where the passageway is not less than 6 feet (1829 
mm) high for its entire length, the passageway shall 
be not greater than 50 feet (15 250 mm) in length. 

[M] 306.3.1 Electrical requirements. A luminaire con- I 
trolled by a switch located at the required passageway open- 
ing and a receptacle outlet shall be provided at or near the 
equipment location in accordance with the ICC Electrical 
Code. 

[M] 306.4 Appliances under floors. Under-floor spaces con- 
taining appliances requiring access shall be provided with an 
access opening and unobstructed passageway large enough to 
remove the largest component of the appHance. The passage- 
way shall not be less than 30 inches (762 mm) high and 22 
inches (559 mm) wide, nor more than 20 feet (6096 mm) in 
length when measured along the centerline of the passageway 
from the opening to the equipment. A level service space not 
less than 30 inches (762 mm) deep and 30 inches (762 mm) 
wide shall be present at the front or service side of the appli- 
ance. If the depth of the passageway or the service space 
exceeds 12 inches (305 mm) below the adjoining grade, the 
walls of the passageway shall be lined with concrete or 
masonry extending 4 inches (102 mm) above the adjoining 
grade and having sufficient lateral-bearing capacity to resist 
collapse. The clear access opening dimensions shall be a mini- 
mum of 22 inches by 30 inches (559 mm by 762 mm), where 
such dimensions are large enough to allow removal of the larg- 
est component of the appliance. 

Exceptions: 

1 . The passageway is not required where the level ser- 
vice space is present when the access is open and the 
appliance is capable of being serviced and removed 
through the required opening. 

2. Where the passageway is not less than 6 feet high 
(1829 mm) for its entire length, the passageway shall 
not be limited in length. 

[M] 306.4.1 Electrical requirements. A luminaire I 
controlled by a switch located at the required passageway 
opening and a receptacle outlet shall be provided at or near 
the equipment location in accordance with the ICC Electri- 
cal Code. 

[M] 306.5 Appliances on roofs or elevated structures. Where 
appUances requiring access are installed on roofs or elevated 
structures at a height exceeding 16 feet (4877 mm), such access 
shall be provided by a permanent approved means of access, 
the extent of which shall be from grade or floor level to the 
appliance's level service space. Such access shall not require 
climbing over obstructions greater than 30 inches high (762 



2006 INTERNATIONAL FUEL GAS CODE® 



23 



GENERAL REGULATIONS 



mm) or walking on roofs having a slope greater than four units 
vertical in 12 units horizontal (3 3 -percent slope). 

Permanent ladders installed to provide the required access 
shall comply with the following minimum design criteria. 

1 . The side railing shall extend above the parapet or roof 
edge not less than 30 inches (762 mm). 

2. Ladders shall have a rung spacing not to exceed 14 
inches (356 mm) on center. 

3. Ladders shall have a toe spacing not less than 6 inches 
(152 mm) deep. 

4. There shall be a minimum of 18 inches (457 mm) 
between rails. 

5. Rungs shall have a minimum diameter of 0.75-inch (19 
mm) and shall be capable of withstanding a 300-pound 
(136.1 kg) load. 

6. Ladders over 30 feet (9144 mm) in height shall be pro- 
vided with offset sections and landings capable of with- 
standing a load of 100 pounds per square foot (488.2 
kg/m^). 

7. Ladders shall be protected against corrosion by 
approved means. 

Catwalks installed to provide the required access shall be not 
less than 24 inches wide (610 mm) and shall have railings as 
required for service platforms. 

Exception: This section shall not apply to Group R-3 occu- 
pancies. 

[M] 306.5.1 Sloped roofs. Where appliances are installed 
on a roof having a slope of three units vertical in 12 units 
horizontal (25 -percent slope) or greater and having an edge 
more than 30 inches (762 mm) above grade at such edge, a 
level platform shall be provided on each side of the 
I appliance to which access is required for service, repair or 
maintenance. The platform shall not be less than 30 inches 
(762 mm) in any dimension and shall be provided with 
guards. The guards shall extend not less than 42 inches 
(1067 mm) above the platform, shall be constructed so as to 
prevent the passage of a 21-inch-diameter (533 mm) sphere 
and shall comply with the loading requirements for guards 
specified in the International Building Code. 

[M] 306.5.2 Electrical requirements. A receptacle outlet 
shall be provided at or near the equipment location in accor- 
dance with the ICC Electrical Code. 

[M] 306.6 Guards. Guards shall be provided where appliances 
I or other components that require service and roof hatch open- 
ings are located within 10 feet (3048 mm) of a roof edge or 
open side of a walking surface and such edge or open side is 
located more than 30 inches (762 mm) above the floor, roof or 
grade below. The guard shall extend not less than 30 inches 

1(762 mm) beyond each end of such appliances, components 
and roof hatch openings and the top of the guard shall be 
located not less than 42 inches (1067 mm) above the elevated 
surface adjacent to the guard. The guard shall be constructed so 
as to prevent the passage of a 21-inch-diameter (533 mm) 
sphere and shall comply with the loading requirements for 
guards specified in the International Building Code. . 



SECTION 307 (IFGC) 
CONDENSATE DISPOSAL 

307.1 Evaporators and cooling coils. Condensate drainage 
systems shall be provided for equipment and appliances con- 
taining evaporators and cooling coils in accordance with the 
International Mechanical Code. 

307.2 Fuel-burning appliances. Liquid combustion by-prod- 
ucts of condensing appliances shall be collected and dis- 
charged to an approved plumbing fixture or disposal area in 
accordance with the manufacturer's installation instructions. 
Condensate piping shall be of approved corrosion-resistant 
material and shall not be smaller than the drain connection on 
the appliance. Such piping shall maintain a minimum slope in 
the direction of discharge of not less than one-eighth unit verti- 
cal in 12 units horizontal (1 -percent slope). 

[M] 307.3 Drain pipe materials and sizes. Components of the 
condensate disposal system shall be cast iron, galvanized steel, 
copper, polybutylene, polyethylene, ABS, CPVC or PVC pipe 
or tubing. All components shall be selected for the pressure and 
temperature rating of the installation. Condensate waste and 
drain line size shall be not less than V4-inch internal diameter 
(19 nrni) and shall not decrease in size from the drain connec- 
tion to the place of condensate disposal. Where the drain pipes 
from more than one unit are manifolded together for conden- 
sate drainage, the pipe or tubing shall be sized in accordance 
with an approved method. All horizontal sections of drain pip- 
ing shall be installed in uniform alignment at a uniform slope. 

307.4 Traps. Condensate drains shall be trapped as required by 
the equipment or appliance manufacturer. 

307.5 Auxiliary drain pan. Category IV condensing apph- 
ances shall be provided with an auxiliary drain pan where dam- 
age to any building component will occur as a result of 
stoppage in the condensate drainage system. Such pan shall be 
installed in accordance with the applicable provisions of Sec- 
tion 307 of the International Mechanical Code. 

Exception: An auxiliary drain pan shall not be required for 
appliances that automatically shut down operation in the 
event of a stoppage in the condensate drainage system. 



SECTION 308 (IFGS) 
CLEARANCE REDUCTION 

308.1 Scope. This section shall govern the reduction in 
required clearances to combustible materials and combustible 
assemblies for chimneys, vents, appliances, devices and equip- 
ment. Clearance requirements for air-conditioning equipment 
and central heating boilers and furnaces shall comply with Sec- 
tions 308.3 and 308.4. 

308.2 Reduction table. The allowable clearance reduction 
shall be based on one of the methods specified in Table 308.2 or 
shall utilize an assembly listed for such application. Where 
required clearances are not listed in Table 308.2, the reduced 
clearances shall be determined by linear interpolation between 
the distances listed in the table. Reduced clearances shall not be 
derived by extrapolation below the range of the table. The 
reduction of the required clearances to combustibles for listed 
and labeled appliances and equipment shall be in accordance 



24 



2006 INTERNATIONAL FUEL GAS CODE^ 



GENERAL REGULATIONS 



with the requirements of this section except that such clear- 
ances shall not be reduced where reduction is specifically pro- 
hibited by the terms of the appliance or equipment listing [see 
Figures 308.2(1) through 308.2(3)]. 

308.3 Clearances for indoor air-conditioning appliances. 

Clearance requirements for indoor air-conditioning appliances 
shall comply with Sections 308.3.1 through 308.3.5. 



308.3.1 Appliances installed in rooms that are large in 
comparison with the size of the appliance. Air-condition- 
ing appliances installed in rooms that are large in compari- 
son with the size of the appliance shall be installed with 
clearances in accordance with the manufacturer's instruc- 
tions. 



TABLE 308.2= "'™"9'"' 
REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION 



TYPE OF PROTECTION APPLIED TO 

AND COVERING ALL SURFACES OF COMBUSTIBLE 

MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE 

REQUIRED CLEARANCE WITH NO PROTECTION 

[see Figures 308.2(1), 308.2(2), and 308.2(3)] 


WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM 
APPLIANCE, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (Inches) 


36 


18 


12 


9 


6 


Allowable clearances with specified protection (inches) 


Use Column 1 for clearances above appliance or horizontal connector. Use Column 2 
for clearances from appliance, vertical connector, and single-wall metal pipe. 


Above 
CoLI 


Sides 

and rear 

CoL2 


Above 
CoLI 


Sides 

and rear 

CoL2 


Above 
Col.1 


Sides 

and rear 

CoL2 


Above 
CoLI 


Sides 

and rear 

CoL2 


Above 
CoLI 


Sides 

and rear 

CoL2 


1. S'A-inch-thick masonry wall without ventilated air- 
space 


— 


24 


— 


12 


— 


9 


— 


6 


— 


5 


2. Vz-inch insulation board over 1-inch glass fiber or 
mineral wool batts 


24 


18 


12 


9 


9 


6 


6 


5 


4 


3 


3 . 0.024-inch (nominal 24 gage) sheet metal over 1 -inch 
glass fiber or mineral wool batts reinforced with wire 
on rear face with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


4. S'A-inch-thick masonry wall with ventilated air- 
space 


— 


12 


— 


6 


— 


6 


— 


6 


— 


6 


5. 0.024-inch (nominal 24 gage) sheet metal with ven- 
tilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


2 


6. Vz-inch- thick insulation board with ventilated air- 
space 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


7. 0.024-inch (nominal 24 gage) sheet metal with ven- 
tilated airspace over 0.024-inch (nominal 24 gage) 
sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 


8 . 1 -inch glass fiber or mineral wool batts sandwiched 
between two sheets 0.024-inch (nominal 24 gage) 
sheet metal with ventilated airspace 


18 


12 


9 


6 


6 


4 


5 


3 


3 


3 



For SI: 1 inch = 25.4 mm, °C = [(°F - 32)/l .8], 1 pound per cubic foot = 16.02 kgin^, 1 Btu per inch per square foot per hour per °F = 0. 144 WAn-^ x K. 

a. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and rehef, and accessibility of servicing. 

b. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any interven- 
ing protection applied to the combustible material. 

c. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an apphance or connector 

d. For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures 308.2(2) and 
308.2(3)]. 

e. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace. 

f. Where a wall protector is mounted on a single flat wall away from comers, it shall have a minimum 1-inch air gap. To provide air circulation, the bottom and top 
edges, or only the side and top edges, or all edges shall be left open. 

g. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1500°E 

h. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less, 
i. There shall be at least 1 inch between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced 

below that allowed in this table, 
j. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable, 
k. Listed single-wall connectors shall be installed in accordance with the manufecturer's installation instructions. 



2006 INTERNATIONAL FUEL GAS CODE® 



25 



GENERAL REGULATIONS 



CONSTRUCTION USING COMBUSTIBLE- 
MATERIAL, PLASTERED OR UNPLASTERED 




SHEET METAL 
OR OTHER 
PROTECTION 



"A" equals the reduced clearance with no protection. 

"B" equals the reduced clearance permitted in accordance with Table 
308.2. The protection applied to the construction using combustible 
material shall extend far enough in each direction to make "C" equal 
to "A." 



FIGURE 308.2(1) 

EXTENT OF PROTECTION NECESSARY TO 

REDUCE CLEARANCES FROM APPLIANCE OR 

VENT CONNECTIONS 



COMBUSTIBLE WALL 



1-INCH MINIMUM 
AIRSPACE BETWEEN 
MASONRY AND 
COMBUSTIBLE WALL 



BOTTOM AND TOP COURSE 
OF BRICKS STAGGERED 
FOR VENTILATION 



A STRIP OF HEAVY-GAUGE STEEL 
USED FOR ADDED SUPPORT 

NOTE DO NOT PLACE MASONRY 
WALL TIES DIRECTLY BEHIND 
APPUANCE OR CONNECTOR 




For SI: 1 inch = 25.4 mm. 



CORRUGATED 
METAL WAa 
TIES 



FIGURE 308.2(3) 
MASONRY CLEARANCE REDUCTION SYSTEM 




VI/ALL PROTECTOR MOUNTED 
W/ITH ALL EDGES OPEN 





WALL PROTECTOR MOUNTED 
ON SINGLE PUT WALL 



MUST BE MOUNTED 
WITH TOP AND BOTTOM 
EDGES OPEN ' 



WALL PROTECTOR INSTALLED 
IN CORNER 



MOUNTED WITH SIDE 
AND TOP EDGES OPEN 



— MOUNTED WITH TOP 
AND BOTTOM EDGES 
OPEN 



■^ 



COMBUSTIBLE 
WALL 






■Nh 



1 INCH 



AIR- 
SPACE 



/ 



NAIL OR SCREW 
ANCHOR 



CLEARANCE 
REDUCTION SYSTEM 



1-INCH NONCOMBUSTIBLE SPACER SUCH AS STACKED WASHERS, SMALL- 
DIAMETER PIPE, TUBING OR ELECTRICAL CONDUIT. 



For SI: 1 inch = 25.4 mm. 



MASONRY WALLS CAN BE ATTACHED TO COMBUSTIBLE WALLS USING WALL TIES, 
DO NOT USE SPACERS DIRECTLY BEHIND APPLIANCE OR CONNECTOR. 



FIGURE 308.2(2) 
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM 



26 



2006 INTERNATIONAL FUEL GAS CODE'' 



GENERAL REGULATIONS 



308.3.2 Appliances installed in rooms that are not large 
in comparison with the size of the appliance. Air-condi- 
tioning appliances installed in rooms that are not large in 
comparison with the size of the appliance, such as alcoves 
and closets, shall be listed for such installations and 
installed in accordance with the manufacturer's instruc- 
tions. Listed clearances shall not be reduced by the protec- 
tion methods described in Table 308.2, regardless of 
whether the enclosure is of combustible or noncombustible 
material. 

308.3.3 Clearance reduction. Air-conditioning appliances 
installed in rooms that are large in comparison with the size 
of the appliance shall be permitted to be installed with 
reduced clearances to combustible material, provided the 
combustible material or appliance is protected as described 
in Table 308.2. 

308.3.4 Plenum clearances. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the clearance shall be 
measured to the surface of the plaster or other 
noncombustible finish where the clearance specified is 2 
inches (51 mm) or less. 

308.3.5 Clearance from supply ducts. Air-conditioning 
I appliances shall have the clearance from supply ducts 

within 3 feet (914 mm) of the furnace plenum be not less 
than that specified from the furnace plenum. Clearance is 
not necessary beyond this distance. 

308.4 Central-heating boilers and furnaces. Clearance 
requirements for central-heating boilers and furnaces shall 
comply with Sections 308.4.1 through 308.4.6. The clearance 
I to these appliances shall not interfere with combustion air; 
draft hood clearance and relief; and accessibility for servicing. 

308.4.1 Appliances installed in rooms that are large in 
comparison with the size of the appliance. Central-heat- 
ing furnaces and low-pressure boilers installed in rooms 

I large in comparison with the size of the appliance shall be 
installed with clearances in accordance with the manufac- 
turer's instructions. 

308.4.2 Appliances installed in rooms that are not large 
in comparison with the size of the appliance. Cen- 
tral-heating furnaces and low-pressure boilers installed in 
rooms that are not large in comparison with the size of the 

I appliance, such as alcoves and closets, shall be listed for 
such installations. Listed clearances shall not be reduced by 
the protection methods described in Table 308.2 and illus- 
trated in Figures 308.2(1) through 308.2(3), regardless of 
whether the enclosure is of combustible or noncombustible 
material. 

308.4.3 Clearance reduction. Central-heating furnaces 
and low-pressure boilers installed in rooms that are large in 
comparison with the size of the appliance shall be permitted 
to be installed with reduced clearances to combustible mate- 
rial provided the combustible material or appliance is pro- 
tected as described in Table 308.2. 

308.4.4 Clearance for servicing appliances. Front clear- 
ance shall be sufficient for servicing the burner and the fur- 
nace or boiler. 



308.4.5 Plenum clearances. Where the furnace plenum is 
adjacent to plaster on metal lath or noncombustible material 
attached to combustible material, the clearance shall be 
measured to the surface of the plaster or other 
noncombustible finish where the clearance specified is 2 
inches (51 mm) or less. 

308.4.6 Clearance from supply ducts. Central-heating 
furnaces shall have the clearance from supply ducts within 3 
feet (914 mm) of the furnace plenum be not less than that 
specified from the furnace plenum. No clearance is neces- 
sary beyond this distance. 



SECTION 309 (IFGC) 
ELECTRICAL 

309.1 Grounding. Gas piping shall not be used as a grounding 
electrode. 

309.2 Connections. Electrical connections between equip- 
ment and the building wiring, including the grounding of the 
equipment, shall conform to the ICC Electrical Code. 



SECTION 310 (IFGS) 
ELECTRICAL BONDING 

310.1 Gas pipe bonding. Each above-ground portion of a gas 
piping system that is likely to become energized shall be elec- 
trically continuous and bonded to an effective ground-fault 
current path. Gas piping shall be considered to be bonded 
where it is connected to appliances that are connected to the 
equipment grounding conductor of the circuit supplying that 
appliance. 



2006 INTERNATIONAL FUEL GAS CODE® 



27 



28 2006 INTERNATIONAL FUEL GAS CODE*^ 



CHAPTER 4 

GAS PIPING INSTALLATIONS 



SECTION 401 (IFGC) 
GENERAL 

401.1 Scope. This chapter shall govern the design, installation, 
modification and maintenance of piping systems. The applica- 
bility of this code to piping systems extends from the point of 
delivery to the connections with the equipment and includes the 
design, materials, components, fabrication, assembly, installa- 
tion, testing, inspection, operation and maintenance of such 
piping systems. 

401.1.1 Utility piping systems located within buildings. 

Utility service piping located within buildings shall be 
installed in accordance with the structural safety and fire 
protection provisions of the International Building Code. 

401.2 Liquefied petroleum gas storage. The storage system 
for liquefied petroleum gas shall be designed and installed in 
accordance with the International Fire Code and NFPA 58. 

401.3 Modifications to existing systems. In modifying or 
adding to existing piping systems, sizes shall be maintained in 
accordance with this chapter. 

401.4 Additional appliances. Where an additional appliance 
is to be served, the existing piping shall be checked to deter- 
mine if it has adequate capacity for all appliances served. If 
inadequate, the existing system shall be enlarged as required or 
separate piping of adequate capacity shall be provided. 

401.5 Identification. For other than steel pipe, exposed piping 
shall be identified by a yellow label marked "Gas" in black let- 
ters. The marking shall be spaced at intervals not exceeding 5 
feet (1524 mm). The marking shall not be required on pipe 
located in the same room as the equipment served. 

401.6 Interconnections. Where two or more meters are 
installed on the same premises but supply separate consumers, 
the piping systems shall not be interconnected on the outlet side 
of the meters. 

401.7 Piping meter identification. Piping from multiple 
meter installations shall be marked with an approved perma- 
nent identification by the installer so that the piping system 
supplied by each meter is readily identifiable. 

401.8 Minimum sizes. All pipe utilized for the installation, 
extension and alteration of any piping system shall be sized to 
supply the full number of outlets for the intended purpose and 
shall be sized in accordance with Section 402. 



SECTION 402 (IFGS) 
PIPE SIZING 

402.1 General considerations. Piping systems shall be of 
such size and so installed as to provide a supply of gas sufficient 
to meet the maximum demand without undue loss of pressure 
between the point of delivery and the appliance. 

402.2 Maximum gas demand. The volume of gas to be pro- 
vided, in cubic feet per hour, shall be determined directly from 



the manufacturer's input ratings of the appliances served. I 
Where an input rating is not indicated, the gas supplier, appli- I 
ance manufacturer or a qualified agency shall be contacted, or 
the rating from Table 402.2 shall be used for estimating the vol- 
ume of gas to be supplied. 

The total connected hourly load shall be used as the basis for 
pipe sizing, assuming that all appliances could be operating at 
full capacity simultaneously. Where a diversity of load can be 
established, pipe sizing shall be permitted to be based on such 
loads. 

TABLE 402.2 
APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES 



APPLIANCE 


INPUT BTU/H 
(Approx.) 


Space Heating Units 

Hydronic boiler 

Single family 

Multifamily, per unit 
Warm-air furnace 

Single family 

Multifamily, per unit 


100,000 
60,000 

100,000 
60,000 


Space and Water Heating Units 

Hydronic boiler 
Single family 
Multifamily, per unit 


120,000 
75,000 


Water Heating Appliances 

Water heater, automatic instantaneous 

Capacity at 2 gal./minute 

Capacity at 4 gal/minute 

Capacity at 6 gal./minute 
Water heater, automatic storage, 30- to 40-gal. tank 
Water heater, automatic storage, 50-gal. tank 
Water heater, domestic, circulating or side-arm 


142,800 
285,000 
428,400 
35,000 
50,000 
35,000 


Cooking Appliances 

Built-in oven or broiler unit, domestic 
Built-in top unit, domestic 
Range, free-standing, domestic 


25,000 
40,000 
65,000 


Other Appliances 

Barbecue 

Clothes dryer, Type 1 (domestic) 

Gas fireplace, direct-vent 

Gas light 

Gas log 

Refrigerator 


40,000 
35,000 
40,000 
2,500 
80,000 
3,000 



For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L, 
1 gallon per minute = 3.785 L/m. 



2006 INTERNATIONAL FUEL GAS CODE® 



29 



GAS PIPING INSTALLATIONS 



402.3 Sizing. Gas piping shall be sized in accordance with one 
of the following: 

1 . Pipe sizing tables or sizing equations in accordance with 
Section 402.4. 

2. The sizing tables included in a listed piping system's 
manufacturer's installation instructions. 

3. Other approved engineering methods. 

402.4 Sizing tables and equations. Where Tables 402.4(1) 
through 402.4(35) are used to size piping or tubing, the pipe 
length shall be determined in accordance with Section 402.4. 1, 
402.4.2 or 402.4.3. 

Where Equations 4-1 and 4-2 are used to size piping or tub- 
ing, the pipe or tubing shall have smooth inside walls and the 
pipe length shall be determined in accordance with Section 
402.4.1, 402.4.2 or 402.4.3. 

1. Low-pressure gas equation [Less than 1.5 pounds per 
square inch (psi) (10.3 kPa)]: 

^0.381 
D = r^,r^ (Equation 4-1) 



r 



1917 



A// 
Cr xL 



0.206 



2. High-pressure gas equation [1.5 psi (10.3 kPa) and 
above]: 



D = 



Q 



0.381 



18.93 



{pi^-Pi^yy 



Cr XL 



0.206 



(Equation 4-2) 



where: 

D = Inside diameter of pipe, inches (mm). 

Q = Input rate appliance(s), cubic feet per hour at 60°F 
(16°C) and 30-inch mercury column 

Pi = Upstream pressure, psia (Pj + 14.7) 

P2 = Downstream pressure, psia (P2 + 14.7) 

L = Equivalent length of pipe, feet 

AH = Pressure drop, inch water column (27 .7 inch water col- 
umn = 1 psi) 



TABLE 402.4 

C, AND /VALUES FOR NATURAL GAS AND 

UNDILUTED PROPANE AT STANDARD CONDITIONS 



GAS 


EQUATION FACTORS 


Cr 


Y 


Natural gas 


0.6094 


0.9992 


Undiluted propane 


1.2462 


0.9910 



For SI: 1 cubic foot = 0.028 m^, 1 foot = 305 mm, 1-inch water column = 
0.249 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal 
unit per hour = 0.293 W. 

402.4.1 Longest length method. The pipe size of each sec- 
tion of gas piping shall be determined using the longest 



length of piping from the point of delivery to the most 
remote outlet and the load of the section. 

402.4.2 Branch length method. Pipe shall be sized as fol- 
lows: 

1 . Pipe size of each section of the longest pipe run from 
the point of delivery to the most remote outlet shall be 
determined using the longest run of piping and the 
load of the section. 

2. The pipe size of each section of branch piping not pre- 
viously sized shall be determined using the length of 
piping from the point of delivery to the most remote 
outlet in each branch and the load of the section. 

402.4.3 Hybrid pressure. The pipe size for each section of 
higher pressure gas piping shall be determined using the 
longest length of piping from the point of delivery to the 
most remote line pressure regulator. The pipe size from the 
line pressure regulator to each outlet shall be determined 
using the length of piping from the regulator to the most 
remote outlet served by the regulator. 

402.5 Allowable pressure drop. The design pressure loss in 
any piping system under maximum probable flow conditions, 
from the point of delivery to the inlet connection of the appli- 
ance, shall be such that the supply pressure at the appliance is 
greater than the minimum pressure required for proper appli- 
ance operation. 

402.6 Maximum design operating pressure. The maximum 
design operating pressure for piping systems located inside 
buildings shall not exceed 5 pounds per square inch gauge 
(psig) (34 kPa gauge) except where one or more of the follow- 
ing conditions are met: 

1. The piping system is welded. 

2. The piping is located in a ventilated chase or otherwise 
enclosed for protection against accidental gas accumula- 
tion. 

3 . The piping is located inside buildings or separate areas of 
buildings used exclusively for: 

3.1. Industrial processing or heating; 

3.2. Research; 

3.3. Warehousing; or 

3.4. Boiler or mechanical rooms. 

4. The piping is a temporary installation for buildings under 
construction. 

402.6.1 Liquefied petroleum gas systems. The operating 
pressure for undiluted LP-gas systems shall not exceed 20 
psig (140 kPa gauge). Buildings having systems designed to 
operate below -5°F (-21°C) or with butane or a pro- 
pane-butane mix shall be designed to either accommodate 
liquid LP-gas or prevent LP-gas vapor from condensing into 
a liquid. 

Exception: Buildings or separate areas of buildings con- 
structed in accordance with Chapter 10 of NFPA 58 and 
used exclusively to house industrial processes, research 
and experimental laboratories, or equipment or process- 
ing having similar hazards. 



30 



2006 INTERNATIONAL FUEL GAS CODE" 



GAS PIPING INSTALLATIONS 





Gas 


Natural 


TABLE 402.4(1) 
SCHEDULE 40 METALLIC PIPE 


Inlet Pressure 


Less than 2 psi 


Pressure Drop 


0.3 in. w.c. 




Specific Gravity 


0.60 






PIPE SIZE (inch) 


Nominal 


V2 


% 


1 


1V4 


1V2 


2 


2'/2 


3 


4 


5 


6 


8 


10 


12 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 


Capacity In Cubic Feet of Gas Per Hour 


10 


131 


273 


514 


1,060 


1,580 


3,050 


4,860 


8,580 


17,500 


31,700 


51,300 


105,000 


191,000 


303,000 


20 


90 


188 


353 


726 


1,090 


2,090 


3,340 


5,900 


12,000 


21,800 


35,300 


72,400 


132,000 


208,000 


30 


72 


151 


284 


583 


873 


1,680 


2,680 


4,740 


9,660 


17,500 


28,300 


58,200 


106,000 


167,000 


40 


62 


129 


243 


499 


747 


1,440 


2,290 


4,050 


8,270 


15,000 


24,200 


49,800 


90,400 


143,000 


50 


55 


114 


215 


442 


662 


1,280 


2,030 


3,590 


7,330 


13,300 


21,500 


44,100 


80,100 


127,000 


60 


50 


104 


195 


400 


600 


1,160 


1,840 


3,260 


6,640 


12,000 


19,500 


40,000 


72,600 


115,000 


70 


46 


95 


179 


368 


552 


1,060 


1,690 


3,000 


6,110 


11,100 


17,900 


36,800 


66,800 


106,000 


80 


42 


89 


167 


343 


514 


989 


1,580 


2,790 


5,680 


10,300 


16,700 


34,200 


62,100 


98,400 


90 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,650 


15,600 


32,100 


58,300 


92,300 


100 


38 


79 


148 


304 


455 


877 


1,400 


2,470 


5,040 


9,110 


14,800 


30,300 


55,100 


87,200 


125 


33 


70 


131 


269 


403 


777 


1,240 


2,190 


4,460 


8,080 


13,100 


26,900 


48,800 


77,300 


150 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4,050 


7,320 


11,900 


24,300 


44,200 


70,000 


175 


28 


58 


109 


224 


336 


648 


1,030 


1,820 


3,720 


6,730 


10,900 


22,400 


40,700 


64,400 


200 


26 


54 


102 


209 


313 


602 


960 


1,700 


3,460 


6,260 


10,100 


20,800 


37,900 


59,900 


250 


23 


48 


90 


185 


277 


534 


851 


1,500 


3,070 


5,550 


8,990 


18,500 


33,500 


53,100 


300 


21 


43 


82 


168 


251 


484 


771 


1,360 


2,780 


5,030 


8,150 


16,700 


30,400 


48,100 


350 


19 


40 


75 


154 


231 


445 


709 


1,250 


2,560 


4,630 


7,490 


15,400 


28,000 


44,300 


400 


18 


37 


70 


143 


215 


414 


660 


1,170 


2,380 


4,310 


6,970 


14,300 


26,000 


41,200 


450 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,230 


4,040 


6,540 


13,400 


24,400 


38,600 


500 


16 


33 


62 


127 


191 


367 


585 


1,030 


2,110 


3,820 


6,180 


12,700 


23,100 


36,500 


550 


15 


31 


59 


121 


181 


349 


556 


982 


2,000 


3,620 


5,870 


12,100 


21,900 


34,700 


600 


14 


30 


56 


115 


173 


333 


530 


937 


1,910 


3,460 


5,600 


11,500 


20,900 


33,100 


650 


14 


29 


54 


110 


165 


318 


508 


897 


1,830 


3,310 


5,360 


11,000 


20,000 


31,700 


700 


13 


27 


52 


106 


159 


306 


488 


862 


1,760 


3,180 


5,150 


10,600 


19,200 


30,400 


750 


13 


26 


50 


102 


153 


295 


470 


830 


1,690 


3,060 


4,960 


10,200 


18,500 


29,300 


800 


12 


26 


48 


99 


148 


285 


454 


802 


1,640 


2,960 


4,790 


9,840 


17,900 


28,300 


850 


12 


25 


46 


95 


143 


275 


439 


776 


1,580 


2,860 


4,640 


9,530 


17,300 


27,400 


900 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4,500 


9,240 


16,800 


26,600 


950 


11 


23 


44 


90 


135 


259 


413 


731 


1,490 


2,700 


4,370 


8,970 


16,300 


25,800 


1,000 


11 


23 


43 


87 


131 


252 


402 


711 


1,450 


2,620 


4,250 


8,720 


15,800 


25,100 


1,100 


10 


21 


40 


83 


124 


240 


382 


675 


1,380 


2,490 


4,030 


8,290 


15,100 


23,800 


1,200 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,400 


22,700 


1,300 


NA 


20 


37 


76 


114 


219 


349 


617 


1,260 


2,280 


3,680 


7,570 


13,700 


21,800 


1,400 


NA 


19 


35 


73 


109 


. 210 


335 


592 


1,210 


2,190 


3,540 


7,270 


13,200 


20,900 


1,500 


NA 


18 


^ 34 


70 


105 


203 


323 


571 


1,160 


2,110 


3,410 


7,010 


12,700 


20,100 


1,600 


NA 


18 


33 


68 


102 


196 


312 


551 


1,120 


2,030 


3,290 


6,770 


12,300 


19,500 


1,700 


NA 


17 


32 


66 


98 


189 


302 


533 


1,090 


1,970 


3,190 


6,550 


11,900 


18,800 


1,800 


NA 


16 


31 


64 


95 


184 


293 


517 


1,050 


1,910 


3,090 


6,350 


11,500 


18,300 


1,900 


NA 


16 


30 


62 


93 


178 


284 


502 


1,020 


1,850 


3,000 


6,170 


11,200 


17,700 


2,000 


NA 


16 


29 


60 


90 


173 


276 


488 


1,000 


1,800 


2,920 


6,000 


10,900 


17,200 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch.= 6.895 kPa, 1-inch 
1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 
Notes: 

1. NA means a flow of less than 10 cfli. 

2. All table entries have been rounded to three significant digits. 



water column = 0.2488 kPa, 
degree = 0.01745 tad. 



2006 INTERNATIONAL FUEL GAS CODE'' 



31 



GAS PIPING INSTALLATIONS 





Gas 


Natural 


TABLE 402.4(2) 
SCHEDULE 40 METALLIC PIPE 


Inlet Pressure 


Less than 2 psi 


Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


0.60 






PIPE SIZE (inch) 


Nominal 


V2 


% 


1 


IV4 


I'll 


2 


2V2 


3 


4 


5 


6 


8 


10 


12 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


172 


360 


678 


1,390 


2,090 


4,020 


6,400 


11,300 


23,100 


41,800 


67,600 


139,000 


252,000 


399,000 


20 


118 


247 


466 


957 


1,430 


2,760 


4,400 


7,780 


15,900 


28,700 


46,500 


95,500 


173,000 


275,000 


30 


95 


199 


374 


768 


1,150 


2,220 


3,530 


6,250 


12,700 


23,000 


37,300 


76,700 


139,000 


220,000 


40 


81 


170 


320 


657 


985 


1,900 


3,020 


5,350 


10,900 


19,700 


31,900 


65,600 


119,000 


189,000 


50 


72 


151 


284 


583 


873 


1,680 


2,680 


4,740 


9,660 


17,500 


28,300 


58,200 


106,000 


167,000 


60 


65 


137 


257 


528 


791 


1,520 


2,430 


4,290 


8,760 


15,800 


25,600 


52,700 


95,700 


152,000 


70 


60 


126 


237 


486 


728 


1,400 


2,230 


3,950 


8,050 


14,600 


23,600 


48,500 


88,100 


139,000 


80 


56 


117 


220 


452 


677 


1,300 


2,080 


3,670 


7,490 


13,600 


22,000 


45,100 


81,900 


130,000 


90 


52 


110 


207 


424 


635 


1,220 


1,950 


3,450 


7,030 


12,700 


20,600 


42,300 


76,900 


122,000 


100 


50 


104 


195 


400 


600 


1,160 


1,840 


3,260 


6,640 


12,000 


19,500 


40,000 


72,600 


115,000 


125 


44 


92 


173 


355 


532 


1,020 


1,630 


2,890 


5,890 


10,600 


17,200 


35,400 


64,300 


102,000 


150 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,650 


15,600 


32,100 


58,300 


92,300 


175 


37 


77 


144 


296 


443 


854 


1,360 


2,410 


4,910 


8,880 


14,400 


29,500 


53,600 


84,900 


200 


34 


71 


134 


275 


412 


794 


1,270 


2,240 


4,560 


8,260 


13,400 


27,500 


49,900 


79,000 


250 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4,050 


7,320 


11,900 


24,300 


44,200 


70,000 


300 


27 


57 


108 


221 


331 


638 


1,020 


1,800 


3,670 


6,630 


10,700 


22,100 


40,100 


63,400 


350 


25 


53 


99 


203 


305 


587 


935 


1,650 


3,370 


6,100 


9,880 


20,300 


36,900 


58,400 


400 


23 


49 


92 


189 


283 


546 


870 


1,540 


3,140 


5,680 


9,190 


18,900 


34,300 


54,300 


450 


22 


46 


86 


177 


266 


512 


816 


1,440 


2,940 


5,330 


8,620 


17,700 


32,200 


50,900 


500 


21 


43 ■ 


82 


168 


251 


484 


771 


1,360 


2,780 


5,030 


8,150 


16,700 


30,400 


48,100 


550 


20 


41 


78 


159 


239 


459 


732 


1,290 


2,640 


4,780 


7,740 


15,900 


28,900 


45,700 


600 


19 


39 


74 


152 


228 


438 


699 


1,240 


2,520 


4,560 


7,380 


15,200 


27,500 


43,600 


650 


18 


38 


71 


145 


218 


420 


669 


1,180 


2,410 


4,360 


7,070 


14,500 


26,400 


41,800 


700 


17 


36 


68 


140 


209 


403 


643 


1,140 


2,320 


4,190 


6,790 


14,000 


25,300 


40,100 


750 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,230 


4,040 


6,540 


13,400 


24,400 


38,600 


800 


16 


34 


63 


130 


195 


375 


598 


1,060 


2,160 


3,900 


6,320 


13,000 


23,600 


37,300 


850 


16 


33 


61 


126 


189 


363 


579 


1,020 


2,090 


3,780 


6,110 


12,600 


22,800 


36,100 


900 


15 


32 


59 


122 


183 


352 


561 


992 


2,020 


3,660 


5,930 


12,200 


22,100 


35,000 


950 


15 


31 


58 


118 


178 


342 


545 


963 


1,960 


3,550 


5,760 


11,800 


21,500 


34,000 


1,000 


14 


30 


56 


115 


173 


333 


530 


937 


1,910 


3,460 


5,600 


11,500 


20,900 


33,100 


1,100 


14 


28 


53 


109 


164 


316 


503 


890 


1,810 


3,280 


5,320 


10,900 


19,800 


31,400 


1,200 


13 


27 


51 


104 


156 


301 


480 


849 


1,730 


3,130 


5,070 


10,400 


18,900 


30,000 


1,300 


12 


26 


49 


100 


150 


289 


460 


813 


1,660 


3,000 


4,860 


9,980 


18,100 


28,700 


1,400 


12 


25 


47 


96 


144 


277 


442 


781 


1,590 


2,880 


4,670 


9,590 


17,400 


27,600 


1,500 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4,500 


9,240 


16,800 


26,600 


1,600 


11 


23 


44 


89 


134 


258 


411 


727 


1,480 


2,680 


4,340 


8,920 


16,200 


25,600 


1,700 


11 


22 


42 


86 


130 


250 


398 


703 


1,430 


2,590 


4,200 


8,630 


15,700 


24,800 


1,800 


10 


22 


41 


84 


126 


242 


386 


682 


1,390 


2,520 


4,070 


8,370 


15,200 


24,100 


1,900 


10 


21 


40 


81 


122 


235 


375 


662 


1,350 


2,440 


3,960 


8,130 


14,800 


23,400 


2,000 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,400 


22,700 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water colunm = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes; 

1 . NA means a flow of less than 10 cfh. 

2. AH table entries have been rounded to three significant digits. 



32 



2006 INTERNATIONAL FUEL GAS CODE"" 



GAS PIPING INSTALLATIONS 





TABLE 402.4(3) 
SCHEDULE 40 METALLIC PIP 


E 


Gas 


Natural 




Inlet Pressure 


210 psi 




Pressure Drop 


1 .0 psi 




Specific Gravity 


0.60 










PIPE SIZE (inch) 


Nominal 


V2 


% 


1 


1V4 


1V2 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


1,510 


3,040 


5,560 


11,400 


17,100 


32,900 


52,500 


92,800 


189,000 


20 


1,070 


2,150 


3,930 


8,070 


12,100 


23,300 


37,100 


65,600 


134,000 


30 


869 


1,760 


3,210 


6,590 


9,880 


19,000 


30,300 


53,600 


109,000 


40 


753 


1,520 


2,780 


5,710 


8,550 


16,500 


26,300 


46,400 


94,700 


50 


673 


1,360 


2,490 


5,110 


7,650 


14,700 


23,500 


41,500 


84,700 


60 


615 


1,240 


2,270 


4,660 


6,980 


13,500 


21,400 


37,900 


77,300 


70 


569 


1,150 


2,100 


4,320 


6,470 


12,500 


19,900 


35,100 


71,600 


80 


532 


1,080 


1,970 


4,040 


6,050 


11,700 


18,600 


32,800 


67,000 


90 


502 


1,010 


1,850 


3,810 


5,700 


11,000 


17,500 


30,900 


63,100 


100 


462 


934 


1,710 


3,510 


5,260 


10,100 


16,100 


28,500 


58,200 


125 


414 


836 


1,530 


3,140 


4,700 


9,060 


14,400 


25,500 


52,100 


150 


372 


751 


1,370 


2,820 


4,220 


8,130 


13,000 


22,900 


46,700 


175 


344 


695 


1,270 


2,601 


3,910 


7,530 


12,000 


21,200 


43,300 


200 


318 


642 


1,170 


2,410 


3,610 


6,960 


11,100 


19,600 


40,000 


250 


279 


583 


1,040 


2,140 


3,210 


6,180 


9,850 


17,400 


35,500 


300 


253 


528 


945 


1,940 


2,910 


5,600 


8,920 


15,800 


32,200 


350 


232 


486 


869 


1,790 


2,670 


5,150 


8,210 


14,500 


29,600 


400 


216 


452 


809 


1,660 


2,490 


4,790 


7,640 


13,500 


27,500 


450 


203 


424 


759 


1,560 


2,330 


4,500 


7,170 


12,700 


25,800 


500 


192 


401 


717 


1,470 


2,210 


4,250 


6,770 


12,000 


24,400 


550 


182 


381 


681 


1,400 


2,090 


4,030 


6,430 


11,400 


23,200 


600 


174 


363 


650 


1,330 


2,000 


3,850 


6,130 


10,800 


22,100 


650 


166 


348 


622 


1,280 


1,910 


3,680 


5,870 


10,400 


21,200 


700 


160 


334 


598 


1,230 


1,840 


3,540 


5,640 


9,970 


20,300 


750 


154 


322 


576 


1,180 


1,770 


3,410 


5,440 


9,610 


19,600 


800 


149 


311 


556 


1,140 


1,710 


3,290 


5,250 


9,280 


18,900 


850 


144 


301 


538 


1,100 


1,650 


3,190 


5,080 


8,980 


18,300 


900 


139 


292 


522 


1,070 


1,600 


3,090 


4,930 


8,710 


17,800 


950 


135 


283 


507 


1,040 


1,560 


3,000 


4,780 


8,460 


17,200 


1,000 


132 


275 


493 


1,010 


1,520 


2,920 


4,650 


8,220 


16,800 


1,100 


125 


262 


468 


960 


1,440 


2,770 


4,420 


7,810 


15,900 


1,200 


119 


250 


446 


917 


1,370 


2,640 


4,220 


7,450 


15,200 


1,300 


114 


239 


427 


878 


1,320 


2,530 


4,040 


7,140 


14,600 


1,400 


110 


230 


411 


843 


1,260 


2,430 


3,880 


6,860 


14,000 


1,500 


106 


221 


396 


812 


1,220 


2,340 


3,740 


6,600 


13,500 


1,600 


102 


214 


382 


784 


1,180 


2,260 


3,610 


6,380 


13,000 


1,700 


99 


207 


370 


759 


1,140 


2,190 


3,490 


6,170 


12,600 


1,800 


96 


200 


358 


736 


1,100 


2,120 


3,390 


5,980 


12,200 


1,900 


93 


195 


348 


715 


1,070 


2,060 


3,290 


5,810 


11,900 


2,000 


91 


189 


339 


695 


1,040 


2,010 


3,200 


5,650 


11,500 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



33 



GAS PIPING INSTALLATIONS 





TABLE 402.4(4) 
SCHEDULE 40 METALLIC PIPI 


E 


Gas 


Natural 




Iniet Pressure 


3.0 psi 




Pressure Drop 


2.0 psi 




Specific Gravity 


0.60 










PIPE SIZE (inch) 


Nominal 


V2 


'U 


1 


1V4 


1V2 


2 


2% 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


1A69 


3.068 


4.026 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


2,350 


4,920 


9,270 


19,000 


28,500 


54,900 


87,500 


155,000 


316,000 


20 


1,620 


3,380 


6,370 


13,100 


19,600 


37,700 


60,100 


106,000 


217,000 


30 


1,300 


2,720 


5,110 


10,500 


15,700 


30,300 


48,300 


85,400 


174,000 


40 


1,110 


2,320 


4,380 


8,990 


13,500 


25,900 


41,300 


73,100 


149,000 


50 


985 


2,060 


3,880 


7,970 


11,900 


23,000 


36,600 


64,800 


132,000 


60 


892 


1,870 


3,520 


7,220 


10,800 


20,800 


33,200 


58,700 


120,000 


70 


821 


1,720 


3,230 


6,640 


9,950 


19,200 


30,500 


54,000 


110,000 


80 


764 


1,600 


3,010 


6,180 


9,260 


17,800 


28,400 


50,200 


102,000 


90 


717 


1,500 


2,820 


5,800 


8,680 


16,700 


26,700 


47,100 


96,100 


100 


677 


1,420 


2,670 


5,470 


8,200 


15,800 


25,200 


44,500 


90,800 


125 


600 


1,250 


2,360 


4,850 


7,270 


14,000 


22,300 


39,500 


80,500 


150 


544 


1,140 


2,140 


4,400 


6,590 


12,700 


20,200 


35,700 


72,900 


175 


500 


1,050 


1,970 


4,040 


6,060 


11,700 


18,600 


32,900 


67,100 


200 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


30,600 


62,400 


250 


412 


862 


1,620 


3,330 


5,000 


9,620 


15,300 


27,100 


55,300 


300 


374 


781 


1,470 


3,020 


4,530 


8,720 


13,900 


24,600 


50,100 


350 


344 


719 


1,350 


2,780 


4,170 


8,020 


12,800 


22,600 


46,100 


400 


320 


669 


1,260 


2,590 


3,870 


7,460 


11,900 


21,000 


42,900 


450 


300 


627 


1,180 


2,430 


3,640 


7,000 


11,200 


19,700 


40,200 


500 


283 


593 


1,120 


2,290 


3,430 


6,610 


10,500 


18,600 


38,000 


550 


269 


563 


1,060 


2,180 


3,260 


6,280 


10,000 


17,700 


36,100 


600 


257 


537 


1,010 


2,080 


3,110 


5,990 


9,550 


16,900 


34,400 


650 


246 


514 


969 


1,990 


2,980 


5,740 


9,150 


16,200 


33,000 


700 


236 


494 


931 


1,910 


2,860 


5,510 


8,790 


15,500 


31,700 


750 


228 


476 


897 


1,840 


2,760 


5,310 


8,470 


15,000 


30,500 


800 


220 


460 


866 


1,780 


2,660 


5,130 


8,180 


14,500 


29,500 


850 


213 


445 


838 


1,720 


2,580 


4,960 


7,910 


14,000 


28,500 


900 


206 


431 


812 


1,670 


2,500 


4,810 


7,670 


13,600 


27,700 


950 


200 


419 


789 


1,620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,000 


195 


407 


767 


1,580 


2,360 


4,550 


7,240 


12,800 


26,100 


1,100 


185 


387 


729 


1,500 


2,240 


4,320 


6,890 


12,200 


24,800 


1,200 


177 


369 


695 


1,430 


2,140 


4,120 


6,570 


11,600 


23,700 


1,300 


169 


353 


666 


1,370 


2,050 


3,940 


6,290 


11,100 


22,700 


1,400 


162 


340 


640 


1,310 


1,970 


3,790 


6,040 


10,700 


21,800 


1,500 


156 


.327 


616 


1,270 


1,900 


3,650 


5,820 


10,300 


21,000 


1,600 


151 


316 


595 


1,220 


1,830 


3,530 


5,620 


10,000 


20,300 


1,700 


146 


306 


576 


1,180 


1,770 


3,410 


5,440 


9,610 


19,600 


1,800 


142 


296 


558 


1,150 


1,720 


3,310 


5,270 


9,320 


19,000 


1,900 


138 


288 


542 


1,110 


1,670 


3,210 


5,120 


9,050 


18,400 


2,000 


134 


280 


527 


1,080 


1,620 


3,120 


4,980 


8,800 


18,000 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



34 



2006 INTERNATIONAL FUEL GAS CODE^ 



GAS PIPING INSTALLATIONS 





TABLE 402.4(5) 
SCHEDULE 40 METALLIC PIPI 


- 


Gas 


Natural 




Inlet Pressure 


5.0 psi 




Pressure Drop 


3.5 psi 




Specific Gravity 


0.60 










PIPE SIZE (inch) 


Nominal 


'/2 


'U 


1 


I'A 


1% 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


3,190 


6,430 


11,800 


24,200 


36,200 


69,700 


111,000 


196,000 


401,000 


20 


2,250 


4,550 


8,320 


17,100 


25,600 


49,300 


78,600 


139,000 


283,000 


30 


1,840 


3,720 


6,790 


14,000 


20,900 


40,300 


64,200 


113,000 


231,000 


40 


1,590 


3,220 


5,880 


12,100 


18,100 


34,900 


55,600 


98,200 


200,000 


50 


1,430 


2,880 


5,260 


10,800 


16,200 


31,200 


49,700 


87,900 


179,000 


60 


1,300 


2,630 


4,800 


9,860 


14,800 


28,500 


45,400 


80,200 


164,000 


70 


1,200 


2,430 


4,450 


9,130 


13,700 


26,400 


42,000 


74,300 


151,000 


80 


1,150 


2,330 


^ 4,260 


8,540 


12,800 


24,700 


39,300 


69,500 


142,000 


90 


1,060 


2,150 


3,920 


8,050 


12,100 


23,200 


37,000 


65,500 


134,000 


100 


979 


1,980 


3,620 


7,430 


11,100 


21,400 


34,200 


60,400 


123,000 


125 


876 


1,770 


3,240 


6,640 


9,950 


19,200 


30,600 


54,000 


110,000 


150 


786 


1,590 


2,910 


5,960 


8,940 


17,200 


27,400 


48,500 


98,900 


175 


728 


1,470 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,600 


200 


673 


1,360 


2,490 


5,100 


7,650 


14,700 


23,500 


41,500 


84,700 


250 


558 


1,170 


2,200 


4,510 


6,760 


13,000 


20,800 


36,700 


74,900 


300 


506 


1,060 


1,990 


4,090 


6,130 


11,800 


18,800 


33,300 


67,800 


350 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


30,600 


62,400 


400 


433 


905 


1,710 


3,500 


5,250 


10,100 


16,100 


28,500 


58,100 


450 


406 


849 


1,600 


3,290 


4,920 


9,480 


15,100 


26,700 


54,500 


500 


384 


802 


1,510 


3,100 


4,650 


8,950 


14,300 


25,200 


51,500 


550 


364 


762 


1,440 


2,950 


4,420 


8,500 


13,600 


24,000 


48,900 


600 


348 


727 


1,370 


2,810 


4,210 


8,110 


12,900 


22,900 


46,600 


650 


333 


696 


1,310 


2,690 


4,030 


7,770 


12,400 


21,900 


44,600 


700 


320 


669 


1,260 


2,590 


3,880 


7,460 


11,900 


21,000 


42,900 


750 


308 


644 


1,210 


2,490 


3,730 


7,190 


11,500 


20,300 


41,300 


800 


298 


622 


1,170 


2,410 


3,610 


6,940 


11,100 


19,600 


39,900 


850 


288 


602 


1,130 


2,330 


3,490 


6,720 


10,700 


18,900 


38,600 


900 


279 


584 


1,100 


2,260 


3,380 


6,520 


10,400 


18,400 


37,400 


950 


271 


567 


1,070 


2,190 


3,290 


6,330 


10,100 


17,800 


36,400 


1,000 


264 


551 


1,040 


2,130 


3,200 


6,150 


9,810 


17,300 


35,400 


1,100 


250 


524 


987 


2,030 


3,030 


5,840 


9,320 


16,500 


33,600 


1,200 


239 


500 


941 


1,930 


2,900 


5,580 


8,890 


15,700 


32,000 


1,300 


229 


478 


901 


1,850 


2,770 


5,340 


8,510 


15,000 


30,700 


1,400 


220 


460 


866 


1,780 


2,660 


5,130 


8,180 


14,500 


29,500 


1,500 


212 


443 


834 


1,710 


2,570 


4,940 


7,880 


13,900 


28,400 


1,600 


205 


428 


806 


1,650 


2,480 


4,770 


7,610 


13,400 


27,400 


1,700 


198 


414 


780 


1,600 


2,400 


4,620 


7,360 


13,000 


26,500 


1,800 


192 


401 


756 


1,550 


2,330. 


4,480 


7,140 


12,600 


25,700 


1,900 


186 


390 


734 


1,510 


2,260 


4,350 


6,930 


12,300 


25,000 


2,000 


181 


379 


714 


1,470 


2,200 


4,230 


6,740 


11,900 


24,300 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



35 



GAS PIPING INSTALLATIONS 





TABLE 402.4(6) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




Inlet Pressure 


Less than 2 psi 




Pressure Drop 


0.3 in. w.c. 




Specific Gravity 


0.60 










TUBE SIZE (inch) 


Nominal 


K&L 


% 


Vs 


V2 


^8 


% 


1 


IV4 


IV2 


2 


ACR 


% 


.. Va 


% 


% 


Vs 


iVg 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 . 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


20 


42 


85 


148 


210 


448 


806 


1,270 


2,650 


20 


14 


29 


58 


102 


144 


308 


554 


873 


1,820 


30 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


40 


10 


20 


40 


70 


99 


211 


381 


600 


1,250 


50 


NA 


17 


35 


62 


88 


187 


337 


532 


1,110 


60 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


70 


NA 


14 


29 


52 


73 


156 


281 


443 


924 


80 


NA 


13 


27 


48 


68 


145 


262 


413 


859 


90 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


100 


NA 


12 


24 


43 


60 


129 


232 


366 


761 


125 


NA 


11 


22 


38 


53 


114 


206 


324 


675 


150 


NA 


10 


20 


34 


48 


103 


186 


294 


612 


175 


NA 


NA 


18 


31 


45 


95 


171 


270 


563 


200 


NA 


NA 


17 


29 


41 


89 


159 


251 


523 


250 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


300 


NA 


NA. 


13 


23 


33 


71 


128 


202 


420 


350 


NA 


NA 


12 


22 


31 


65 


118 


186 


387 


400 


NA 


NA 


11 


20 


28 


61 


110 


173 


360 


450 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


500 


NA 


NA 


10 


18 


25 


54 


97 


153 


319 


550 


NA 


NA 


NA 


17 


24 


51 


92 


145 


303 


600 


NA. 


NA 


NA 


16 


23 


49 


88 


139 


289 


650 


NA 


NA 


NA- 


15 


22 


47 


84 


133 


277 


700 


NA 


NA 


NA 


15 


21 


45 


81 


128 


266 


750 


NA 


NA 


NA 


14 


20 


43 


78 


123 


256 


800 


NA 


NA 


NA 


14 


20 


42 


75 


119 


247 


850 


NA 


NA 


NA 


13 


19 


40 


73 


115 


239 


900 


NA 


NA 


NA 


13 


18 


39 


71 


111 


232 


950 


NA 


NA 


NA 


13 


18 


38 


69 


108 


225 


1,000 


NA 


NA 


NA 


12 


17 


37 , 


67 


105 


219 


1,100 


NA 


NA 


NA 


12 


16 


35 


63 


100 


208 


1,200 


NA . 


NA 


NA 


11 


16 


34 


60 


95 


199 


1,300 


NA 


NA 


NA 


11 


15 


32 


58 


91 


190 


1,400 


NA 


NA 


NA 


10 


14 


31 


56 


88 


183 


1,500 


NA 


NA 


NA 


NA 


14 


30 


54 


84 


176 


1,600 


NA 


NA - 


NA 


NA 


13 


29 


52 


82 


170 


1,700 


NA 


NA 


NA 


NA 


13 


28 


50 


79 


164 


1,800 


NA 


NA 


NA 


NA 


13 


27 


49 


77 


159 


1,900 


NA 


NA 


NA 


NA 


12 


26 


47 


74 


155 


2,000 


NA 


NA 


NA 


NA 


12 


25 


46 


72 


151 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour - 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



36 



2006 INTERNATIONAL FUEL GAS CODE*^ 



GAS PIPING INSTALLATIONS 





Gas 


Natural 


TABLE 402.4(7) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


Less than 2 psi 


Pressure Drop 


0.5 in. w.c. 




Specific Gravity 


0.60 






TUBE SIZE (inch) 


Nominal 


K&L 


% 


\ 


V2 


=/8 


% 


1 


IV4 


IV2 


2 


ACR 


\ 


V2 


^/8 


% 


\ 


iVs 


1^/8 


— 


— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per IHour 


10 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


20 


18 


38 


77 


134 


190 


406 


730 


1,150 


2,400 


30 


15 


30 


61 


107 


152 


326 


586 


925 


1,930 


40 


13 


26 


53 


92 


131 


279 


502 


791 


1,650 


50 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


60 


10 


21 


42 


74 


105 


224 


403 


635 


1,320 


70 


NA 


19 


39 


68 


96 


206 


371 


585 


1,220 


80 


NA 


18 


36 


63 


90 


192 


345 


544 


1,130 


90 


NA 


17 


34 


59 


84 


180 


324 


510 


1,060 


100 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


125 


NA 


14 


28 


50 


70 


151 


271 


427 


890 


150 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


175 


NA 


12 


24 


41 


59 


125 


226 


356 


742 


200 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


250 


NA 


NA 


20 


34 


48 


103 


186 


294 


612 


300 


NA 


NA 


18 


31 


44 


94 


169 


266 


554 


350 


NA 


NA 


16 


28 


40 


86 


155 


245 


510 


400 


NA 


NA 


15 


26 


38 


80 


144 


228 


474 


450 


NA 


NA 


14 


25 


35 


75 


135 


214 


445 


500 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


550 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


600 


NA 


NA 


12 


21 


30 


64 


116 


183 


381 


650 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


700 


NA 


NA 


11 


20 


28 


59 


107 


168 


350 


750 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


800 


NA 


NA 


10 


18 


26 


55 


99 


156 


326 


850 


NA 


NA 


10 


18 


25 


53 


96 


151 


315 


900 


NA 


NA 


NA 


17 


24 


52 


93 


147 


306 


950 


NA 


NA 


NA 


17 


24 


50 


90 


143 


297 


1,000 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 


1,100 


NA 


NA 


NA 


15 


22 


46 


84 


132 


274 


1,200 


NA 


NA 


NA 


15 


21 


44 


80 


126 


262 


1,300 


NA 


NA 


NA 


14 


20 


42 


76 


120 


251 


1,400 


NA 


NA 


NA 


13 


19 


41 


73 


116 


241 


1,500 


NA 


NA 


NA 


13 


18 


39 


71 


111 


232 


1,600 


NA 


NA 


NA 


13 


18 


38 


68 


108 


224 


1,700 


NA 


NA 


NA 


12 


17 


37 


66 


104 


217 


1,800 


NA 


NA 


NA 


12 


17 


36 


64 


101 


210 


1,900 


NA 


NA 


NA 


11 


16 


35 


62 


98 


204 


2,000 


NA 


NA 


NA 


11 


16 


34 


60 


95 


199 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes; 

1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



37 



GAS PIPING INSTALLATIONS 





TABLE 402.4(8) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




Inlet Pressure 


Less than 2 psi 




Pressure Drop 


1.0 in. w.c. 




Specific Gravity 


0.60 












TUBE SIZE (inch) 


Nominal 


K&L 


'A 


\ 


% 


% ■ 


\ 


1 


1V4 


1V2 


2 




ACR 


% 


V2 


% 


'U 


\ 


iVs 


1% 


. 


— ■ 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 . 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


39 


80 


162 


283 


402 


859 


1,550 


2,440 


5,080 


20 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


30 


21 


44 


89 


156 


222 


474 


853 


1,350 


2,800 


40 


18 


38 


77 


134 


190 


406 


730 


1,150 


2,400 


50 


16 


33 


68 


119 


168 


359 


647 


1,020 


2,130. 


60 


15 


30 


61 


107 


152 


326 


586 


925 


1,930 


70 


13 


28 


57 


99 


140 


300 


539 


851 


1,770 


80 


13 


26 


53 


92 


131 


279 


502 


791 


1,650 


90 


12 


24 


49 


86 


122 


262 


471 


742 


1,550 


100 


11 


23 


47 


82 


116 


247 


445 


701 . 


1,460 


125 


NA 


20 


41 


72 


103 


219 


394 


622 


1,290 


150 


NA 


18 


37 


65 


93 


. 198 


357 


563 


1,170 


175 


NA 


17 


34 


60 


85 


183 


329 


518 


1,080 


200 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


250 


NA 


14 


28 


50 


70 


, 151 


271 


427 


890 


300 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


350 


NA 


12 


24 


41 


59 


125 


226 


356 


742 


400 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


450 


NA 


10 


21 


36 


51 


110 


197 


311 


647 


500 


NA 


NA 


20 


34 


48 


103 


186 


294 


612 


550 


NA 


NA 


19 


32 


46 


98 


177 


279 


581 


600 


NA 


NA 


18 


31 


44 


94 


169 


266 


554 


650 


NA 


NA 


17 


30 


42 


90 


162 


255 


531 


700 


NA 


NA 


16 


28 


40 


86 


155 


245 


510 


750 


NA 


NA 


16 


27 


39 


83 


150 


236 


491 


800 


NA 


NA 


15 


26 


38 


80 


144 


228 


474 


850 


NA 


NA 


15 


26 


36 


78 


140 


220 


459 


900 


NA 


NA 


14 


25 


35 


75 


135 


214 


445 


950 


NA 


NA 


14 


24 


34 


73 


132 


207 


432 


1,000 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


1,100 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


1,200 


NA 


NA 


12 


21 


30 


64 


116 


183 


381 


1,300 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


1,400 


NA 


NA 


11 


20 


28 


59 


107 


168 


. 350 


1,500 


NA 


NA 


11 


19 


27 


57 


103 


162 


... 338 


1,600 


NA 


NA 


10 


18 


26 


55 


99 


156 


326 


1,700 


NA 


NA 


10 


18 


25 


53 


96 


151 


315 


1,800 


NA 


NA 


NA 


17 


. 24 


52 


93 


147 


306 


1,900 


NA 


NA 


NA 


17 


24 


50 


90 


143 


297 


2,000 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10 cfh. 

3. All table entries have been rounded to three significant digits. 



38 



2006 INTERNATIONAL FUEL GAS CODE*^ 



GAS PIPING INSTALLATIONS 





TABLE 402.4(9) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




inlet Pressure 


Less than 2.0 psi 




Pressure Drop 


17.0in w.c. 




Specific Gravity 


0.60 










TUBE SIZE (inch) 


Nominal 


K&L 


% 


\ 


V2 


% 


V4 


1 


1V4 


1V2 


2 


ACR 


% 


V2 


% 


% 


% 


iVa 


iVa 


— 


— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


190 


391 


796 


1,390 


1,970 


4,220 


7,590 


12,000 


24,900 


20 


130 


269 


547 


956 


1,360 


2,900 


5,220 


8,230 


17,100 


30 


105 


216 


439 


768 


1,090 


2,330 


4,190 


6,610 


13,800 


40 


90 


185 


376 


657 


932 


1,990 


3,590 


5,650 


11,800 


50 


79 


164 


333 


582 


826 


1,770 


3,180 


5,010 


10,400 


60 


72 


148 


302 


528 


749 


1,600 


2,880 


4,540 


9,460 


70 


66 


137 


278 


486 


689 


1,470 


2,650 


4,180 


8,700 


80 


62 


127 


258 


452 


641 


1,370 


2,460 


3,890 


8,090 


90 


58 


119 


243 


424 


601 


1,280 


2,310 


3,650 


7,590 


100 


55 


113 


229 


400 


568 


1,210 


2,180 


3,440 


7,170 


125 


48 


100 


203 


355 


503 


1,080 


1,940 


3,050 


6,360 


150 


44 


90 


184 


321 


456 


974 


1,750 


2,770 


5,760 


175 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


200 


38 


77 


157 


275 


390 


834 


1,500 


2,370 


4,930 


250 


33 


69 


140 


244 


346 


739 


1,330 


2,100 


4,370 


300 


30 


62 


126 


221 


313 


670 


1,210 


1,900 


3,960 


350 


28 


57 


116 


203 


288 


616 


1,110 


1,750 


3,640 


400 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


450 


24 


50 


102 


177 


252 


538 


968 


1,530 


3,180 


500 


23 


47 


96 


168 


238 


508 


914 


1,440 


3,000 


550 


22 


45 


91 


159 


226 


482 


868 


1,370 


2,850 


600 


21 


43 


87 


152 


215 


460 


829 


1,310 


2,720 


650 


20 


41 


83 


145 


206 


441 


793 


1,250 


2,610 


700 


19 


39 


80 


140 


198 


423 


762 


1,200 


2,500 


750 


18 


38 


77 


135 


191 


408 


734 


1,160 


2,410 


800 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


850 


17 


35 


72 


126 


178 


381 


686 


1,080 


2,250 


900 


17 


34 


70 


122 


173 


370 


665 


1,050 


2,180 


950 


16 


33 


68 


118 


168 


359' 


646 


1,020 


2,120 


1,000 


16 


32 


66 


115 


163 


349 


628 


991 


2,060 


1,100 


15 


31 


63 


109 


155 


332 


597 


941 


1,960 


1,200 


14 


29 


60 


104 


148 


316 


569 


898 


1,870 


1,300 


14 


28 


57 


100 


142 


303 


545 


860 


1,790 


1,400 


13 


27 


55 


96 


136 


291 


524 


826 


1,720 


1,500 


13 


26 


53 


93 


131 


280 


505 


796 


1,660 


1,600 


12 


25 


51 


89 


127 


271 


487 


768 


1,600 


1,700 


12 


24 


49 


86 


123 


262 


472 


744 


1,550 


1,800 


11 


24 


48 


84 


119 


254 


457 


721 


1,500 


1,900 


11 


23 


47 


81 


115 


247 


444 


700 


1,460 


2,000 


11 


22 


45 


,79 


112 


240 


432 


681 


1,420 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

I British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 rrilh, 1 degree = 0.01745 rad. 
Notes: 

1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE*^ 



39 



GAS PIPING INSTALLATIONS 





TABLE 402.4(10) 
SEMIRIGID COPPER TUBING 




Gas 


Natural 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1.0 psi 




Specific Gravity 


0.60 


TUBE SIZE (inch) 


Nominal 


K&L 


V4 


% 


V2 


'/8 


% 


1 


IV4 


IV2 


' 2 




ACR 


% 


% 


% 


% 


Vs 


iVg 


1% 





— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 ■ 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


245 


506 


1,030 


1,800 


2,550 


5,450 


9,820 


15,500 


32,200 , 


20 


169 


348 


708 


1,240 


1,760 


3,750 


6,750 


10,600 , 


22,200 


30 


135 


279 


568 


993 


1,410 


3,010 


5,420 


8,550 


17,800 


40 


116 


239 


486 


850 


1,210 


2,580 . 


4,640 


7,310 


15,200 


50 


103 


212 


431 


754 


1,070 


2,280 


4,110 


6,480 


13,500 


60 


93 


192 


391 


683 


969 


2,070 


3,730 


5,870 


12,200 


70 


86 


177 


359 


628 


891 


1,900 


3,430 


5,400 


11,300 


80 


80 


164 


334 


584 


829 


1,770 


3,190 


5,030 


10,500 


90 


75 


154 


314 


548 


778 


1,660 


2,990 


4,720 


9,820 


100 


71 


146 


296 


518 


735 


1,570 


2,830 


4,450 


9,280 


125 


63 


129 


263 


459 


651 


1,390 


2,500 


3,950 


8,220 


150 


57 


117 


238 


416 


590 


1,260 


2,270 


3,580 


7,450 


175 


52 


108 


219 


383 


543 


1,160 


2,090 


3,290 


6,850 


200 


49 


100 


204 


356 


505 


1,080 


1,940 


3,060 


6,380 


250 


43 


89 


181 


315 


448 


956 


1,720 


2,710 


5,650 


300 


39 


80 


164 


286 


406 


866 


1,560 


2,460 


5,120 


350 


36 


74 


150 


263 


373 


797 


1,430 


2,260 


4,710 


400 


33 


69 


140 


245 


347 


741 


1,330 


2,100 


4,380 


450 


31 


65 


131 


230 


326 


696 


1,250 


1,970 


4,110 


500 


30 


61 


124 


217 


308 


657 


i,180 


1,870 


3,880 


550 


28 


58 


118 


206 


292 


624 


1,120 


1,770 


3,690 


600 


27 


55 


112 


196 


279 


595 


1,070 


1,690 


3,520 


650 


26 


53 


108 


188 


267 


570 


1,030 


1,620 


3,370 


700 


25 


51 


103 


181 


256 


548 


986 


1,550 


3,240 


750 


24 


49 


100 


174 


247 


528 


950 


1,500 


3,120 


800 


23 


47 


96 


168 


239 


510 


917 


1,450 


3,010 


850 


22 


46 


93 


163 


231 


493 


888 


1,400 


2,920 


900 


22 


44 


90 


158 


224 


478 


861 


1,360 


2,830 


950 


21 


43 


88 


153 


217 


464 


836 


1,320 


2,740 


1,000 


20 


42 


85 


149 


211 


452 


813 


1,280 


2,670 


1,100 


19 


40 


81 


142 


201 


429 


772 


1,220 


2,540 


1,200 


18 


38 


77 


135 


192 


409 


737 


1,160 


2,420 


1,300 


18 


36 


74 


129 


183 


392 


705 


1,110 


2,320 


1,400 


17 


35 


71 


124 


176 


376 


678 


1,070 


2,230 


1,500 


16 


34 


68 


120 


170 


363 


653 


1,030 


2,140 


1,600 


16 


33 


66 


116 


164 


350 


630 


994 


2,070 


1,700 


15 


31 


64 


112 


159 


339 


610 


962 


2,000 


1,800 


15 


30 


62 


108 


154 


329 


592 


933 


1,940 


1,900 


14 


30 


60 


105 


149 


319 


575 


906 


1,890 


2,000 


14 


29 


59 


102 


145 


310 


559 


881 


1,830 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



40 



2006 INTERNATIONAL FUEL GAS CODE'' 



GAS PIPING INSTALLATIONS 





Gas 


Natural 


TABLE 402.4(11) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


2.0 psi 


Pressure Drop 


1 .5 psi 




Specific Gravity 


0.60 






SPECIAL 
USE 


Pipe sizing between point of delivery and the house line regulator. Total load supplied by a single house line regulator not exceeding 150 
cubic feet per hour. 


TUBE SIZE (Inch) 


Nominal 


K&L 


V4 


% 


V2 


=/8 


V4 


1 


IV4 


1V2 


2 




ACR 


\ 


V2 


^/8 . 


% 


^/8 


I'/s 


1% 





— 


Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


303 


625 


1,270 


2,220 


3,150 


6,740 


12,100 


19,100 


39,800 


20 


208 


430 


874 


1,530 


2,170 


4,630 


8,330 


13,100 


27,400 


30 


167 


345 


702 


1,230 


1,740 


3,720 


6,690 


10,600 


22,000 


40 


143 


295 


601 


1,050 


1,490 


3,180 


5,730 


9,030 


18,800 


50 


127 


262 


532 


931 


1,320 


2,820 


5,080 


8,000 


16,700 


60 


115 


237 


482 


843 


1,200 


2,560 


4,600 


7,250 


15,100 


70 


106 


218 


444 


776 


1,100 


2,350 


4,230 


6,670 


13,900 


80 


98 


203 


413 


722 


1,020 


2,190 


3,940 


6,210 


12,900 


90 


92 


190 


387 


677 


961 


2,050 


3,690 


5,820 


12,100 


100 


87 


180 


366 


640 


907 


1,940 


3,490 


5,500 


11,500 


125 


77 


159 


324 


567 


804 


1,720 


3,090 


4,880 


10,200 


150 


70 


144 


294 


514 


729 


1,560 


2,800 


4,420 


9,200 


175 


64 


133 


270 


472 


670 


1,430 


2,580 


4,060 


8,460 


200 


60 


124 


252 


440 


624 


1,330 


2,400 


3,780 


7,870 


250 


53 


110 


223 


390 


553 


, 1,180 


2,130 


3,350 


6,980 


300 


48 


99 


202 


353 


501 


1,070 


1,930 


3,040 


6,320 


350 


44 


91 


186 


325 


461 


984 


1,770 


2,790 


5,820 


400 


41 


85 


173 


302 


429 


916 


1,650 


2,600 


5,410 


450 


39 


80 


162 


283 


402 


859 


1,550 


2,440 


5,080 


500 


36 


75 


153 


268 


380 


811 


1,460 


2,300 


4,800 


550 


35 


72 


146 


254 


361 


771 


1,390 


2,190 


4,560 


600 


33 


68 


139 


243 


344 


735 


1,320 


2,090 


4,350 


650 


32 


65 


133 


232 


330 


704 


1,270 


2,000 


4,160 


700 


30 


63 


128 


223 


317 


676 


1,220 


1,920 


4,000 


750 


29 


60 


123 


215 


305 


652 


1,170 


1,850 


3,850 


800 


28 


58 


119 


208 


295 


629 


1,130 


1,790 


3,720 


850 


27 


57 


115 


201 


285 


609 


1,100 


1,730 


3,600 


900 


27 


55 


111 


195 


276 


590 


1,060 


1,680 


3,490 


950 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


1,000 


25 


52 


105 


184 


261 


558 


1,000 


1,580 


3,300 


1,100 


24 


49 


100 


175 


248 


530 


954 


1,500 


3,130 


1,200 


23 


47 


95 


167 


237 


505 


910 


1,430 


2,990 


1,300 


22 


45 


91 


160 


227 


484 


871 


1,370 


2,860 


1,400 


21 


43 


88 


153 


218 


465 


837 


1,320 


2,750 


1,500 


20 


42 


85 


148 


210 


448 


806 


1,270 


2,650 


1,600 


19 


40 


82 


143 


202 


432 


779 


1,230 


2,560 


1,700 


19 


39 


79 


138 


196 


419 


753 


1,190 


2,470 


1,800 


18 


38 


77 


134 


190 


406 


731 


1,150 


2,400 


1,900 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


2,000 


17 


36 


72 


126 


179 


383 


690 


1,090 


2,270 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. Where this table is used to size the tubing upstream of a line pressure regulator, the pipe or tubing downstream of the Une pressure regulator shall be sized using a pressine drop not greater 
than 1 inch w.c. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE" 



41 



GAS PIPING INSTALLATIONS 





Gas 


Natural 


TABLE 402.4(12) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 




Specific Gravity 


0.60 






TUBE SIZE (inch) 


Nominal 


K&L 


V4 


% 


V2 


% 


% 


1 


1V4 


1V2 


2 


ACR 


% 


'li 


Vs 


% 


\ 


iVs 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


LengtIi (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


511 


1,050 


2,140 


3,750 


5,320 


11,400 


20,400 


32,200 


67,100 


20 


.351 


724 


1,470 


2,580 


3,650 


7,800 


14,000 


22,200 


46,100 


30 


282 


582 


1,180 


2,070 


2,930 


6,270 


11,300 


17,800 


37,000 


40 


241 


498 


1,010 


1,770 


2,510 


5,360 


9,660 


15,200 


31,700 


50 


214 


441 


898 


1,570 


2,230 


4,750 


8,560 


13,500 


28,100 


60 


194 


400 


813 


1,420 


2,020 


4,310 


7,750 


12,200 


25,500 


70 


178 


368 


748 


1,310 


1,860 


3,960 


7,130 


11,200 


23,400 


80 


166 


342 


696 


1,220 


1,730 


3,690 


6,640 


10,500 


21,800 


90 


156 


321 


653 


1,140 


1,620 


3,460 


6,230 


9,820 


20,400 


100 


147 


303 


617 


1,080 


1,530 


3,270 


5,880 


9,270 


19,300 


125 


130 


269 


547 


955 


1,360 


2,900 


5,210 


8,220 


17,100 


150 


118 


243 


495 


866 


1,230 


2,620 


4,720 


7,450 


15,500 


175 


109 


224 


456 


796 


1,130 


2,410 


4,350 


6,850 


14,300 


200 


101 


208 


424 


741 


1,050 


2,250 


4,040 


6,370 


13,300 


250 


90 


185 


376 


657 


932 


1,990 


3,580 


5,650 


11,800 


300 


81 


167 


340 


595 


844 


1,800 


3,250 


5,120 


10,700 


350 


75 


154 


313 


547 


777 


1,660 


2,990 


4,710 


9,810 


400 


69 


143 


291 


509 


722 


1,540 


2,780 


4,380 


9,120 


450 


65 


134 


273 


478 


678 


1,450 


2,610 


4,110 


8,560 


500 


62 


127 


258 


451 


640 


1,370 


2,460 


3,880 


8,090 


550 


58 


121 


245 


429 


608 


1,300 


2,340 


3,690 


7,680 


600 


56 


115 


234 


409 


580 


1,240 


2,230 


3,520 


7,330 


650 


53 


110 


224 


392 


556 


1,190 


2,140 


3,370 


7,020 


700 


51 


106 


215 


376 


534 


1,140 


2,050 


3,240 


6,740 


750 


49 


102 


207 


362 


514 


1,100 


1,980 


3,120 


6,490 


800 


48 


98 


200 


350 


497 


1,060 


1,910 


3,010 


6,270 


850 


46 


95 


194 


339 


481 


1,030 


1,850 


2,910 


6,070 


900 


45 


92 


188 


328 


466 


1,000 


1,790 


2,820 


5,880 


950 


43 


90 


182 


319 


452 


967 


1,740 


2,740 


5,710 


1,000 


42 


87 


177 


310 


440 


940 


1,690 


2,670 


5,560 


1,100 


40 


83 


169 


295 


418 


893 


1,610 


2,530 


5,280 


1,200 


38 


79 


161 


281 


399 


852 


1,530 


2,420 


5,040 


1,300 


37 


76 


154 


269 


382 


816 


1,470 


2,320 


4,820 


1,400 


35 


73 


148 


259 


367 


784 


1,410 


2,220 


4,630 


1,500 


34 


70 


143 


249 


353 


755 


1,360 


2,140 


4,460 


1,600 


33 


68 


138 


241 


341 


729 


1,310 


2,070 


4,310 


1,700 


32 


65 


133 


233 


330 


705 


1,270 


2,000 


4,170 


1,800 


31 


63 


129 


226 


320 


684 


1,230 


1,940 


4,040 


1,900 


30 


62 


125 


219 


311 


664 


1,200 


1,890 


3,930 


2,000 


29 


60 


122 


213 


302 


646 


1,160 


1,830 


3,820 



For SI: 



Notes: 



1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 
1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 iti'/h, 1 degree = 0.01745 rad. 



1 . Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



42 



2006 INTERNATIONAL FUEL GAS CODE*^ 



GAS PIPING INSTALLATIONS 





Gas 1 


Matural 


TABLE 402.4(13) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 1 


.ess than 2 psi 


Pressure Drop ( 


3.5 in. w.c. 




Specific Gravity ( 


).60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


5 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


10 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,260 


1,470 


2,600 


2,930 


15 


25 


35 


66 


77 


132 


157 


267 


310 


524 


1,030 


1,200 


2,140 


2,400 


20 


22 


31 


58 


67 


116 


137 


231 


269 


456 


888 


1,050 


1,850 


2,080 


25 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 


30 


18 


25 


47 


55 


96 


112 


188 


218 


374 


723 


856 


1,520 


1,700 


40 


15 


21 


41 


47 


83 


97 


162 


188 


325 


625 


742 


1,320 


1,470 


50 


13 


19 


37 


42 


75 


87 


144 


168 


292 


559 


665 


1,180 


1,320 


60 


12 


17 


34 


38 


'68 


80 


131 


153 


267 


509 


608 


1,080 


1,200 


70 


11 


16 


31 


36 


63 


74 


121 


141 


248 


471 


563 


1,000 


1,110 


80 


10 


15 


29 


33 


60 


69 


113 


132 


232 


440 


527 


940 


1,040 


90 


10 


14 


28 


32 


57 


65 


107 


125 


219 


415 


498 


887 


983 


100 


9 


13 


26 


30 


54 


62 


101 


118 


208 


393 


472 


843 


933 


150 


7 


10 


20 


23 


42 


48 


78 


91 


171 


320 


387 


691 


762 


200 


6 


9 


18 


21 


38 


44 


71 


82 


148 


277 


336 


600 


661 


250 


5 


8 


16 


19 


34 


39 


63 


74 


133 


247 


301 


538 


591 


300 


5 


7 


15 


17 


32 


36 


57 


67 


95 


226 


275 


492 


540 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British therraal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n, where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



43 



GAS PIPING INSTALLATIONS 





Gas r 


slatural 


TABLE 402.4(14) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure L 


.ess than 2 psi 


Pressure Drop 3.0 in. w.c. 




Specific Gravity 0.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per l^our 


5 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


2,140 


4,430 


5,010 


8,800 


10,100 


10 


83 


112 


197 


231 


380 


462 


828 


958 


1,530 


3,200 


3,560 


6,270 


7,160 


15 


67 


90 


161 


189 


313 


379 


673 


778 


1,250 


2,540 


2,910 


5,140 


5,850 


20 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,200 


2,530 


4,460 


5,070 


25 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,960 


2,270 


4,000 


4,540 


30 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


40 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


50 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,850 


3,210 


60 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,260 


1,470 


2,600 


2,930 


70 


29 


41 


76 


88 


150 


178 


306 


355 


593 


1,170 


1,360 


2,420 


2,720 


80 


27 


38 


71 


82 


141 


167 


285 


331 


555 


1,090 


1,280 


2,260 


2,540 


90 


26 


36 


67 


77 


133 


157 


268 


311 


524 


1,030 


1,200 


2,140 


2,400 


100 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140_ 


2,030 


2,280 


150 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 


200 


17 


23 


45 


52 


91 


106 


178 


207 


355 


686 


812 


1,440 


1,610 


250 


15 


21 


40 


46 


82 


95 


159 


184 


319 


613 


728 


1,290 


1,440 


300 


13 


19 


37 


42 


75 


87 


144 


168 


234 


559 


665 


1,180 


1,320 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour - 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L=l.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydrauUc efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



44 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 





Gas 1 


vlatural 


TABLE 402.4(15) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 1 


.ess than 2 psi 


Pressure Drop ( 


3.0 in. w.c. 




Specific Gravity ( 


3.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


5 


173 


229 


389 


461 


737 


911 


1,690 


1,950 


3,000 


6,280 


7,050 


12,400 


14,260 


10 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


2,140 


4,430 


5,010 


8,800 


10,100 


15 


96 


130 


227 


267 


436 


532 


960 


1,110 


1,760 


3,610 


4,100 


7,210 


8,260 


20 


83 


112 


197 


231 


380 


462 


828 


958 


1,530 


3,120 


3,560 


6,270 


7,160 


25 


74 


99 


176 


207 


342 


414 


739 


855 


1,370 


2,790 


3,190 


5,620 


6,400 


30 


67 


90 


161 


189 


313 


379 


673 


778 


1,250 


2,540 


2,910 


5,140 


5,850 


40 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,200 


2,530 


4,460 


5,070 


50 


51 


69 


125 


147 


245 


295 


518 


599 


978 


1,960 


2,270 


4,000 


4,540 


60 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


70 


42 


58 


106 


124 


209 


250 


435 


505 


830 


1,660 


1,920 


3,390 


3,840 


80 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


90 


37 


51 


94 


109 


185 


221 


383 


444 


735 


1,460 


1,700 


3,000 


3,390 


100 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,850 


3,210 


150 


28 


39 


73 


85 


145 


172 


294 


342 


573 


1,130 


1,320 


2,340 


2,630 


200 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140 


2,030 


2,280 


250 


21 


30 


57 


66 


114 


134 


226 


263 


447 


870 


1,020 


1,820 


2,040 


300 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


936 


1,660 


1,860 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPaj 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1 . Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L= 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — ^Equivalent Hydraulic Diameter, which is a measure of the relative hydrauhc efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE*^ 



45 



GAS PIPING INSTALLATIONS 





Gas r 


vlaturai 


TABLE 402.4(16) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure < 


^0 psi 


Pressure Drop 


.Opsi 




Specific Gravity ( 


}.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


270 


353 


587 


700 


1,100 


1,370 


2,590 


2,990 


4,510 


9,600 


10,700 


18,600 


21,600 


25 


166 


220 


374 


444 


709 


876 


1,620 


1,870 


2,890 


6,040 


6,780 


11,900 


13,700 


30 


151 


200 


342 


405 


650 


801 


1,480 


1,700 


2,640 


5,510 


6,200 


10,900 


12,500 


40 


129 


172 


297 


351 


567 


696 


1,270 


1,470 


2,300 


4,760 


5,380 


9,440 


10,900 


50 


115 


154 


266 


314 


510 


624 


1,140 


1,310 


2,060 


4,260 


4,820 


8,470 


9,720 


75 


93 


124 


218 


257 


420 


512 


922 


1,070 


1,690 


3,470 


3,950 


6,940 


7,940 


80 


89 


120 


211 


249 


407 


496 


892 


1,030 


1,640 


3,360 


3,820 


6,730 


7,690 


100 


79 


107 


189 


222 


366 


445 


795 


920 


1,470 


3,000 


3,420 


6,030 


6,880 


150 


64 


87 


155 


182 


302 


364 


646 


748 


1,210 


2,440 


2,800 


4,940 


5,620 


200 


55 


75 


135 


157 


263 


317 


557 


645 


1,050 


2,110 


2,430 


4,290 


4,870 


250 


49 


67 


121 


141 


236 


284 


497 


576 


941 


1,890 


2,180 


3,850 


4,360 


300 


44 


61 


110 


129 


217 


260 


453 


525 


862 


1,720 


1,990 


3,520 


3,980 


400 


38 


52 


96 


111 


189 


225 


390 


453 


749 


1,490 


1,730 


3,060 


3,450 


500 


34 


46 


86 


100 


170 


202 


348 


404 


552 


1,330 


1,550 


2,740 


3,090 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.293 1 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1 . Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds V4 psi, DO NOT USE THIS TABLE. Consult with the regula- 
tor manufacturer for pressure drops and capacity fectors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guid- 
ance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1 .3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



46 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 





Gas 


statural 


TABLE 402.4(17) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 


5.0 psi 


Pressure Drop « 


3.5 psi 




Specific Gravity ( 


D.60 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas Per Hour 


10 


523 


674 


1,080 


1,300 


2,000 


2,530 


4,920 


5,660 


8,300 


18,100 


19,800 


34,400 


40,400 


25 


322 


420 


691 


827 


1,290 


1,620 


3,080 


3,540 


5,310 


11,400 


12,600 


22,000 


25,600 


30 


292 


382 


632 


755 


1,180 


1,480 


2,800 


3,230 


4,860 


10,400 


11,500 


20,100 


23,400 


40 


251 


329 


549 


654 


1,030 


1,280 


2,420 


2,790 


4,230 


8,970 


10,000 


17,400 


20,200 


50 


223 


293 


492 


586 


926 


1,150 


2,160 


2,490 


3,790 


8,020 


8,930 


15,600 


18,100 


75 


180 


238 


403 


479 


763 


. 944 


1,750 


2,020 


3,110 


6,530 


7,320 


12,800 


14,800 


- 80 


174 


230 


391 


463 


740 


915 


1,690 


1,960 


3,020 


6,320 


7,090 


12,400 


14,300 


100 


154 


205 


350 


415 


665 


820 


1,510 


1,740 


2,710 


5,650 


6,350 


11,100 


12,800 


150 


124 


166 


287 


339 


548 


672 


1,230 


1,420 


2,220 


4,600 


5,200 


9,130 


10,500 


200 


107 


143 


249 


294 


478 


584 


1,060 


1,220 


1,930 


3,980 


4,510 


7,930 


9,090 


250 


95 


128 


223 


263 


430 


524 


945 


1,090 


1,730 


3,550 


4,040 


7,110 


8,140 


300 


86 


116 


204 


240 


394 


479 


860 


995 


1,590 


3,240 


3,690 


6,500 


7,430 


400 


74 


100 


177 


208 


343 


416 


742 


858 


1,380 


2,800 


3,210 


5,650 


6,440 


500 


66 


89 


159 


186 


309 


373 


662 


766 


1,040 


2,500 


2,870 


5,060 


5,760 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. ' 
Notes: 

1 . Table does not include effect of pressure drop across the Une regulator. Where regulator loss exceeds V4 psi, DO NOT USE THIS TABLE. Consult with the regula- 
tor manufacturer for pressure drpps and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table may exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent HydrauUc Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



47 



GAS PIPING INSTALLATIONS 





TABLE 402.4(18) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






iniet Pressure 


Less than 2 


psi 






Pressure Drop 


0.3 in. w.c. 






Specific Gravity 


0.60 


PIPE SIZE (in.) 


Nominal OD 


V, 


'U 


1 


IV, 


1% 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual iD 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


153 


305 


551 


955 


1,440 


2,590 


20 


105 


210 


379 


656 


991 


1,780 


30 


84 


169 


304 


527 


796 


1,430 


40 


72 


144 


260 


451 


681 


1,220 


50 


64 


128 


231 


400 


604 


1,080 


60 


58 


116 


209 


362 


547 


983 


70 


53 


107 


192 


333 


503 


904 


80 


50 


99 


179 


310 


468 


841 


90 


46 


93 


168 


291 


439 


789 


100 


44 


88 


159 


275 


415 


745 


125 


39 


78 


141 


243 


368 


661 


150 


35 


71 


127 


221 


333 


598 


175 


32 


65 


117 


203 


306 


551 


200 


30 


60 


109 


189 


285 . 


512 


250 


27 


54 


97 


167 


253 


454 


300 


24 


48 


88 


152 


229 


411 


350 


22 


45 


81 


139 


211 


378 


400 


21 


42 


75 


130 


196 


352 


450 


19 


39 


70 


122 


184 


330 


500 


18 


37 


66 


115 


174 


312 



For SI: 1 inch = 25.4 mm, 1 foot = 304.^ 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



\ mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 
0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
to three significant digits. 



kPa, 



48 



2006 INTERNATIONAL FUEL GAS CODE*° 



GAS PIPING INSTALLATIONS 





TABLE 402.4(19) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






Inlet Pressure 


Less than 2 psi 






Pressure Drop 


0.5 in. w.c. 






Specific Gravity 


0.60 


PIPE SIZE (in.) 


Nominal OD 


% 


V. 


1 


IV. 


IV. 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per IHour 


10 


201 


403 


726 


1,260 


1,900 


3,410 


20 


138 


277 


499 


865 


1,310 


2,350 


30 


111 


222 


401 


695 


1,050 


1,880 


40 


95 


190 


343 


594 


898 


1,610 


50 


84 


169 


304 


527 


796 


1,430 


60 


76 


153 


276 


477 


721 


1,300 


70 


70 


140 


254 


439 


663 


1,190 


80 


65 


131 


236 


409 


617 


1,110 


90 


61 


123 


221 


383 


579 


1,040 


100 


58 


116 


209 


362 


547 


983 


125 


51 


103 


185 


321 


485 


871 


150 


46 


93 


168 


291 


439 


789 


175 


43 


86 


154 


268 


404 


726 


200 


40 


80 


144 


249 


376 


675 


250 


35 


71 


127 


221 


333 


598 


300 


32 


64 


115 


200 


302 


542 


350 


29 


59 


106 


184 


278 


499 


400 


27 


55 


99 


171 


258 


464 


450 


26 


51 


93 


160 


242 


435 


500 


24 


48 


88 


152 


229 


411 



For SI: 1 inch = 25.4 mm, 1 foot = 304.J 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



! mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 
0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
to three significant digits. 



kPa, 



2006 INTERNATIONAL FUEL GAS CODE® 



49 



GAS PIPING INSTALLATIONS 





TABLE 402.4(20) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Natural 






Inlet Pressure 


2.0 psi 






Pressure Drop 


1.0 psi 






Specific Gravity 


0.60 


PIPE SIZE (in.) 


Nominal OD 


V, 


'u 


1 


1% 


iV, 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


1,860 


3,720 


6,710 


11,600 


17,600 


31,600 


20 


1,280 


2,560 


4,610 


7,990 


12,100 


21,700 


30 


1,030 


2,050 


3,710 


6,420 


9,690 


17,400 


40 


878 


1,760 


3,170 


5,490 


8,300 


14,900 


50 


778 


1,560 


2,810 


4,870 


7,350 


13,200 


60 


705 


1,410 


2,550 


4,410 


6,660 


12,000 


70 


649 


1,300 


2,340 


4,060 


6,130 


11,000 


80 


603 


1,210 


2,180 


3,780 


5,700 


10,200 


90 


566 


1,130 


2,050 


3,540 


5,350 


9,610 


100 


535 


1,070 


1,930 


3,350 


5,050 


9,080 


125 


474 


949 


1,710 


2,970 


4,480 


8,050 


150 


429 


860 


1,550 


2,690 


4,060 


7,290 


175 


395 


791 


1,430 


2,470 


3,730 


6,710 


200 


368 


736 


1,330 


2,300 


3,470 


6,240 


250 


326 


652 


1,180 


2,040 


3,080 


5,530 


300 


295 


591 


1,070 


1,850 


2,790 


5,010 


350 


272 


544 


981 


1,700 


2,570 


4,610 


400 


253 


506 


913 


1,580 


2,390 


4,290 


450 


237 


475 


856 


1,480 


2,240 


4,020 


500 


224 


448 


809 


1,400 


2,120 


3,800 


550 


213 


426 


768 


1,330 


2,010 


3,610 


600 


203 • 


406 


733 


1,270 


1,920 


3,440 


650 


194 


389 


702 


1,220 


1,840 


3,300 


700 


187 


374 


674 


1,170 


1,760 


3,170 


750 


180 


360 


649 


1,130 


1,700 


3,050 


800 


174 


348 


627 


1,090 


1,640 


2,950 


850 


168 


336 


607 


1,050 


1,590 


2,850 


900 


163 


326 


588 


1,020 


1,540 


2,770 


950 


158 


317 


572 


990 


1,500 


2,690 


1,000 


154 


308 


556 


963 


1,450 


2,610 


1,100 


146 


293 


528 


915 


1,380 


2,480 


1,200 


139 


279 


504 


873 


1,320 


2,370 


1,300 


134 


267 


482 


836 


1,260 


2,270 


1,400 


128 


257 


463 


803 


1,210 


2,180 


1,500 


124 


247 


446 


773 


1,170 


2,100 


1,600 


119 


239 


431 


747 


1,130 


2,030 


1,700 


115 


231 


417 


723 


1,090 


1,960 


1,800 


112 


224 


404 


701 


1,060 


1,900 


1,900 


109 


218 


393 


680 


1,030 


1,850 


2,000 


106 


212 


382 


662 


1,000 


1,800 



For SI: 1 inch = 25.4 mm, 1 foot = 304. 

1 British thermal unit per hour = 

Note: All table entries have been rounded to 



8 mm, 1 pound per square inch = 6. 
= 0.2931 W, 1 cubic foot per hour = 
three significant digits. 



895 kPa, 1-inch water 
0.0283 m'/h, 1 degree 



column = 0.2488 kPa, 
= 0.01745 rad. 



50 



2006 INTERNATIONAL FUEL GAS CODE*^ 



GAS PIPING INSTALLATIONS 



TABLE 402.4(21) 
POLYETHYLENE PLASTIC TUBING 



TABLE 402.4(22) 
POLYETHYLENE PLASTIC TUBING 



Gas 


Natural 


Inlet Pressure 


Less than 2.0 psi 


Pressure Drop 


0.3 in. w.c. 


Specific Gravity 


0.60 






PLASTIC TUBING SIZE (CTS) (in.) 


Nominal OD 


% 


% 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


54 


372 


20 


37 


256 


30 


30 


205 


40 


26 


176 


50 


23 


156 


60 


21 


141 


70 


19 


130 


80 


18 


121 


90 


17 


113 


100 


16 


107 


125 


14 


95 


150 


13 


86 


175 


12 


79 


200 


11 


74 


225 


10 


69 


250 


NA 


65 


275 


NA 


62 


300 


NA 


59 


350 


NA 


54 


400 


NA 


51 


450 


NA 


47 


500 


NA 


45 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.293 1 W, 

1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 

Notes: 

1. NA means a flow of less than 10 cfh. 

2. All table entries have been rounded to three significant digits. 



Gas 


Natural 


Inlet Pressure 


Less than 2.0 psi 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


0.60 






PLASTIC TUBING SIZE (CTS) (in.) 


Nominal OD 


% 


% 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


72 


490 


20 


49 


337 


30 


39 


271 


40 


34 


232 


50 


30 


205 


60 


27 


186 


70 


25 


171 


80 


23 


159 


90 


22 


149 


100 


21 


141 


125 


18 


125 


150 


17 


113 


175 


15 


104 


200 


14 


97 


225 


13 


91 


250 


12 


86 


275 


11 


82 


300 


11 


78 


350 


10 


72 


400 


NA 


67 


450 


NA 


63 


500 


NA 


59 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water colunm = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 

1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 

Notes: 

1. NA means a flow of less than 10 cfh. 

2. AU table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE'' 



51 



GAS PIPING INSTALLATIONS 





Gas 


Undiluted Propane 


TABLE 402.4(23) 
SCHEDULE 40 METALLIC PIPE 


Inlet Pressure 


10.0 psi 


Pressure Drop 


1.0 psi 




Specific Gravity 


1.50 


SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 




PIPE SIZE (in.) 


Nominal 


% 


% 


1 


1V4 


1V2 


2 


I'll 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


3,320 


6,950 


13,100 


26,900 


40,300 


77,600 


124,000 


219,000 


446,000 


20 


2,280 


4,780 


9,000 


18,500 


27,700 


53,300 


85,000 


150,000 


306,000 


30 


1,830 


3,840 


7,220 


14,800 


22,200 


42,800 


68,200 


121,000 


246,000 


40 


1,570 


3,280 


6,180 


12,700 


19,000 


36,600 


58,400 


103,000 


211,000 


50 


1,390 


2,910 


5,480 


11,300 


16,900 


32,500 


51,700 


91,500 


187,000 


60 


1,260 


2,640 


4,970 


10,200 


15,300 


29,400 


46,900 


82,900 


169,000 


70 


1,160 


2,430 


4,570 


9,380 


14,100 


27,100 


43,100 


76,300 


156,000 


80 


1,080 


2,260 


4,250 


8,730 


13,100 


25,200 


40,100 


70,900 


145,000 


90 


1,010 


2,120 


3,990 


8,190 


12,300 


23,600 


37,700 


66,600 


136,000 


100 


956 


2,000 


3,770 


7,730 


11,600 


22,300 


35,600 


62,900 


128,000 


125 


848 


1,770 


3,340 


6,850 


10,300 


19,800 


31,500 


55,700 


114,000 


150 


768 


1,610 


3,020 


6,210 


9,300 


17,900 


28,600 


50,500 


103,000 


175 


706 


1,480 


2,780 


5,710 


8,560 


16,500 


26,300 


46,500 


94,700 


200 


657 


1,370 


2,590 


5,320 


7,960 


15,300 


24,400 


43,200 


88,100 


250 


582 


1,220 


2,290 


4,710 


7,060 


13,600 


21,700 


38,300 


78,100 


300 


528 


1,100 


2,080 


4,270 


6,400 


12,300 


19,600 


34,700 


70,800 


350 


486 


1,020 


1,910 


3,930 


5,880 


11,300 


18,100 


31,900 


65,100 


400 


452 


945 


1,780 


3,650 


5,470 


10,500 


16,800 


29,700 


60,600 


450 


424 


886 


1,670 


3,430 


5,140 


9,890 


15,800 


27,900 


56,800 


500 


400 


837 


1,580 


3,240 


4,850 


9,340 


14,900 


26,300 


53,700 


550 


380 


795 


1,500 


3,070 


4,610 


8,870 


14,100 


25,000 


51,000 


600 


363 


759 


1,430 


2,930 


4,400 


8,460 


13,500 


23,900 


48,600 


650 


347 


726 


1,370 


2,810 


4,210 


8,110 


12,900 


22,800 


46,600 


700 


334 


698 


1,310 


2,700 


4,040 


7,790 


12,400 


21,900 


44,800 


750 


321 


672 


1,270 


2,600 


3,900 


7,500 


12,000 


21,100 


43,100 


800 


310 


649 


1,220 


2,510 


3,760 


7,240 


11,500 


20,400 


41,600 


850 


300 


628 


1,180 


2,430 


3,640 


7,010 


11,200 


19,800 


40,300 


900 


291 


609 


1,150 


2,360 


3,530 


6,800 


10,800 


19,200 


39,100 


950 


283 


592 


1,110 


2,290 


3,430 


6,600 


10,500 


18,600 


37,900 


1,000 


275 


575 


1,080 


2,230 


3,330 


6,420 


10,200 


18,100 


36,900 


1,100 


261 


546 


1,030 


2,110 


3,170 


6,100 


9,720 


17,200 


35,000 


1,200 


249 


521 


982 


2,020 


3,020 


5,820 


9,270 


16,400 


33,400 


1,300 


239 


499 


940 


1,930 


2,890 


5,570 


8,880 


15,700 


32,000 


1,400 


229 


480 


903 


1,850 


2,780 


5,350 


8,530 


15,100 


30,800 


1,500 


221 


462 


870 


1,790 


2,680 


5,160 


8,220 


14,500 


29,600 


1,600 


213 


446 


840 


1,730 


2,590 


4,980 


7,940 


14,000 


28,600 


1,700 


206 


432 


813 


1,670 


2,500 


4,820 


7,680 


13,600 


27,700 


1,800 


200 


419 


789 


1,620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,900 


194 


407 


766 


1,570 


2,360 


4,540 


7,230 


12,800 


26,100 


2,000 


189 


395 


745 


1,530 


2,290 


4,410 


7,030 


12,400 


25,400 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 
1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour 
Note: All table entries have been rounded to three significant digits. 



6.895 kPa, 1-inch water 
= 0.0283 m'/h, 1 degree 



column = 0.2488 kPa, 
= 0.01745 rad. 



52 



2006 INTERNATIONAL FUEL GAS CODE*^ 



GAS PIPING INSTALLATIONS 





TABLE 402.4(24) 
SCHEDULE 40 METALLIC PIPE 




Gas 


Undiluted Propane 




Inlet Pressure 


10.0 psi 




Pressure Drop 


3.0 psi 




Specific Gravity 


1.50 


SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 


PIPE SIZE (in) 


Nominal 


V2 


'U 


1 


l'/4 


IV2 


2 


2% 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


5,890 


12,300 


23,200 


47,600 


71,300 


137,000 


219,000 


387,000 


789,000 


20 


4,050 


8,460 


15,900 


32,700 


49,000 


94,400 


150,000 


266,000 


543,000 


30 


3,250 


6,790 


12,800 


26,300 


39,400 


75,800 


121,000 


214,000 


436,000 


40 


2,780 


5,810 


11,000 


22,500 


33,700 


64,900 


103,000 


183,000 


373,000 


50 


2,460 


5,150 


9,710 


19,900 


29,900 


57,500 


91,600 


162,000 


330,000 


60 


2,230 


4,670 


8,790 


18,100 


27,100 


52,100 


83,000 


147,000 


299,000 


70 


2,050 


4,300 


8,090 


16,600 


24,900 


47,900 


76,400 


135,000 


275,000 


80 


1,910 


4,000 


7,530 


15,500 


23,200 


44,600 


71,100 


126,000 


256,000 


90 


1,790 


3,750 


7,060 


14,500 


21,700 


41,800 


66,700 


118,000 


240,000 


100 


1,690 


3,540 


6,670 


13,700 


20,500 


39,500 


63,000 


111,000 


227,000 


125 


1,500 


3,140 


5,910 


12,100 


18,200 


35,000 


55,800 


98,700 


201,000 


150 


1,360 


2,840 


5,360 


11,000 


16,500 


31,700 


50,600 


89,400 


182,000 


175 


1,250 


2,620 


4,930 


10,100 


15,200 


29,200 


46,500 


82,300 


167,800 


200 


1,160 


2,430 


4,580 


9,410 


14,100 


27,200 


43,300 


76,500 


156,100 


250 


1,030 


2,160 


4,060 


8,340 


12,500 


24,100 


38,400 


67,800 


138,400 


300 


935 


1,950 


3,680 


7,560 


11,300 


21,800 


34,800 


61,500 


125,400 


350 


860 


1,800 


3,390 


6,950 


10,400 


20,100 


32,000 


56,500 


115,300 


400 


800 


1,670 


3,150 


6,470 


9,690 


18,700 


29,800 


52,600 


107,300 


450 


751 


1,570 


2,960 


6,070 


9,090 


17,500 


27,900 


49,400 


100,700 


500 


709 


1,480 


2,790 


5,730 


8,590 


16,500 


26,400 


46,600 


95,100 


550 


673 


1,410 


2,650 


5,450 


8,160 


.15,700 


25,000 


44,300 


90,300 


600 


642 


1,340 


2,530 


5,200 


7,780 


15,000 


23,900 


42,200 


86,200 


650 


615 


1,290 


2,420 


4,980 ^ 


7,450 


14,400 


22,900 


40,500 


82,500 


700 


591 


1,240 


2,330 


4,780 


7,160 


13,800 


22,000 


38,900 


79,300 


750 


569 


1,190 


2,240 


4,600 


6,900 


13,300 


21,200 


37,400 


76,400 


800 


550 


1,150 


2,170 


4,450 


6,660 


12,800 


20,500 


36,200 


73,700 


850 


532 


1,110 


2,100 


4,300 


6,450 


12,400 


19,800 


35,000 


71,400 


900 


516 


1,080 


. 2,030 


4,170 


6,250 


12,000 


19,200 


33,900 


69,200 


950 


501 


1,050 


1,970 


4,050 


6,070 


11,700 


18,600 


32,900 


67,200 


1,000 


487 


1,020 


1,920 


3,940 


5,900 


11,400 


18,100 


32,000 


65,400 


1,100 


463 


968 


1,820 


3,740 


5,610 


10,800 


17,200 


30,400 


62,100 


1,200 


442 


923 


1,740 


3,570 


5,350 


10,300 


16,400 


29,000 


59,200 


1,300 


423 


884 


1,670 


3,420 


5,120 


9,870 


15,700 


27,800 


56,700 


1,400 


406 


849 


1,600 


3,280 


4,920 


9,480 


15,100 


26,700 


54,500 


1,500 


391 


818 


1,540 _ 


3,160 


4,740 


9,130 


14,600 


25,700 


52,500 


1,600 


378 


790 


1,490 


3,060 


4,580 


8,820 


14,100 


24,800 


50,700 


1,700 


366 


765 


1,440 


2,960 


4,430 


8,530 


13,600 


24,000 


49,000 


1,800 


355 


741 


1,400 


2,870 


4,300 


8,270 


13,200 


23,300 


47,600 


1,900 


344 


720 


1,360 


.2,780 


4,170 


8,040- 


12,8.00 


22,600 


46,200 


2,000 


335 


700 


1,320 


2,710 


4,060 


7,820 


12,500 


22,000 


44,900 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 vcilh, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE<^ 



53 



GAS PIPING INSTALLATIONS 





TABLE 402.4(25) 
SCHEDULE 40 METALLIC PIPE 




Gas 


Undiluted Propane 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1 .0 psi 




Specific Gravity 


1.50 










PIPE SIZE (In.) 


Nominal 


\ 


\ 


1 


IV4 


IV2 


2 


2V2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


2,680 


5,590 


10,500 


21,600 


32,400 


62,400 


99,500 


176,000 


359,000 


20 


1,840 


3,850 


7,240 


14,900 


22,300 


42,900 


68,400 


121,000 


247,000 


30 


1,480 


3,090 


5,820 


11,900 


17,900 


34,500 


54,900 


97,100 


198,000 


40 


1,260 


2,640 


4,980 


10,200 


15,300 


29,500 


47,000 


83,100 


170,000 


50 


1,120 


2,340 


4,410 


9,060 


13,600 


26,100 


41,700 


73,700 


150,000 


60 


1,010 


2,120 


4,000 


8,210 


12,300 


23,700 


37,700 


66,700 


136,000 


70 


934 


1,950 


3,680 


7,550 


11,300 


21,800 


34,700 


61,400 


125,000 


80 


869 


1,820 


3,420 


7,020 


10,500 


20,300 


32,300 


57,100 


116,000 


90 


815 


1,700 


3,210 


6,590 


9,880 


19,000 


30,300 


53,600 


109,000 


100 


770 


1,610 


3,030 


6,230 


9,330 


18,000 


28,600 


50,600 


103,000 


125 


682 


1,430 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,500 


150 


618 


1,290 


2,440 


5,000 


7,490 


14,400 


23,000 


40,700 


82,900 


175 


569 


1,190 


2,240 


4,600 


6,890 


13,300 


21,200 


37,400 


76,300 


200 


529 


1,110 


2,080 


4,280 


6,410 


12,300 


19,700 


34,800 


71,000 


250 


469 


981 


1,850 


3,790 


5,680 


10,900 


17,400 


30,800 


62,900 


300 


425 


889 


1,670 


3,440 


5,150 


9,920 


15,800 


27,900 


57,000 


350 


391 


817 


1,540 


3,160 


4,740 


9,120 


14,500 


25,700 


52,400 


400 


364 


760 


1,430 


2,940 


4,410 


8,490 


13,500 


23,900 


48,800 


450 


341 


714 


1,340 


2,760 


4,130 


7,960 


12,700 


22,400 


45,800 


500 


322 


674 


1,270 


2,610 


3,910 


7,520 


12,000 


21,200 


43,200 


550 


306 


640 


1,210 


2,480 


3,710 


7,140 


11,400 


20,100 


41,100 


600 


292 


611 


1,150 


2,360 


3,540 


6,820 


10,900 


19,200 


39,200 


650 


280 


585 


1,100 


2,260 


3,390 


6,530 


10,400 


18,400 


37,500 


700 


269 


562 


1,060 


2,170 


3,260 


6,270 


9,990 


17,700 


36,000 


750 


259 


541 


1,020 


2,090 


3,140 


6,040 


9,630 


17,000 


34,700 


800 


250 


523 


985 


2,020 


3,030 


5,830 


9,300 


16,400 


33,500 


850 


242 


506 


953 


1,960 


2,930 


5,640 


9,000 


15,900 


32,400 


900 


235 


490 


924 


1,900 


2,840 


5,470 


8,720 


15,400 


31,500 


950 


228 


476 


897 


1,840 


2,760 


5,310 


8,470 


15,000 


30,500 


1,000 


222 


463 


873 


1,790 


2,680 


5,170 


8,240 


14,600 


29,700 


1,100 


210 


440 


829 


1,700 


2,550 


4,910 


7,830 


13,800 


28,200 


1,200 


201 


420 


791 


1,620 


2,430 


4,680 


7,470 


13,200 


26,900 


1,300 


192 


402 


757 


1,550 


2,330 


4,490 


7,150 


12,600 


25,800 


1,400 


185 


386 


727 


1,490 


2,240 


4,310 


6,870 


12,100 


24,800 


1,500 


178 


372 


701 


1,440 


2,160 


4,150 


6,620 


11,700 


23,900 


1,600 


172 


359 


677 


1,390 


2,080 


4,010 


6,390 


11,300 


23,000 


1,700 


166 


348 


655 


1,340 


2,010 


3,880 


6,180 


10,900 


22,300 


1,800 


161 


337 


635 


1,300 


1,950 


3,760 


6,000 


10,600 


21,600 


1,900 


157 


327 


617 


1,270 


1,900 


3,650 


5,820 


10,300 


21,000 


2,000 


152 


318 


600 


1,230 


1,840 


3,550 


5,660 


10,000 


20,400 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch - 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



54 



2006 INTERNATIONAL FUEL GAS CODE'= 



GAS PIPING INSTALLATIONS 



TABLE 402.4(26) 
SCHEDULE 40 METALLIC PIPE 



Gas 


Undiluted Propane 


Inlet Pressure 


11.0in. w.c. 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


1.50 



SPECIAL USE 


Pipe sizing between first stage (high-pressure regulator) and second stage ( 


ow-pressure regulator). 




PIPE SIZE (in.) 


Nominal 


V2 


\ 


1 


1V4 


IV2 


2 


2'/2 


3 


4 


Actual ID 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


291 


608 


1,150 


2,350 


3,520 


6,790 


10,800 


19,100 


39,000 


20 


200 


418 


787 


1,620 


2,420 


4,660 


7,430 


13,100 


26,800 


30 


160 


336 


632 


1,300 


1,940 


3,750 


5,970 


10,600 


21,500 


40 


137 


287 


541 


1,110 


1,660 


3,210 


5,110 


9,030 


18,400 


50 


122 


255 


480 


985 


1,480 


2,840 


4,530 


8,000 


16,300 


60 


110 


231 


434 


892 


1,340 


2,570 


4,100 


7,250 


14,800 


80 


101 


212 


400 


821 


1,230 


2,370 


3,770 


6,670 


13,600 


100 


94 


197 


372 


763 


1,140 


2,200 


3,510 


6,210 


12,700 


125 


89 


185 


349 


716 


1,070 


2,070 


3,290 


5,820 


11,900 


150 


84 


175 


330 


677 


1,010 


1,950 


3,110 


5,500 


11,200 


175 


74 


155 


292 


600 


899 


1,730 


2,760 


4,880 


9,950 


200 


67 


140 


265 


543 


814 


1,570 


2,500 


4,420 


9,010 


250 


62 


129 


243 


500 


749 


1,440 


2,300 


4,060 


8,290 


300 


58 


120 


227 


465 


697 


1,340 


2,140 


3,780 


7,710 


350 


51 


107 


201 


412 


618 


1,190 


1,900 


3,350 


6,840 


400 


46 


97 


182 . 


373 


560 


1,080 


1,720 


3,040 


6,190 


450 


42 


89 


167 


344 


515 


991 


1,580 


2,790 


. 5,700 


500 


40 


83 


156 


320 


479 


922 


1,470 


2,600 


5,300 


550 


37 


78 


146 


300 


449 


865 


1,380 


2,440 


4,970 


600 


35 


73 


138 


283 


424 


817 


1,300 


2,300 


4,700 


650 


33 


70 


131 


269 


403 


776 


1,240 


2,190 


4,460 


700 


32 


66 


125 


257 


385 


741 


1,180 _j 


2,090 


4,260 


750 


30 


64 


120 


246 


368 


709 


1,130 


2,000 


4,080 


800 


29 


61 


115 


236 


354 


681 


1,090 


1,920 


3,920 


850 


^ 28 


59 


111 


227 


341 


656 


1,050 


1,850 


3,770 


900 


27 


57 


107 


220 


329 


634 


1,010 


1,790 


3,640 


950 


26 


55 


104 


213 


319 


613 


978 


1,730 


3,530 


1,000 


25 


53 


100 


206 


309 


595 


948 


1,680 


3,420 


1,100 


25 


52 


97 


200 


300 


578 


921 


1,630 


3,320 


1,200 


24 


50 


95 


195 


292 


562 


895 


1,580 


3,230 


1,300 


23 


48 


90 


185 


277 


534 


850 


1,500 


3,070 


1,400 


22 


46 


86 


176 


264 


509 


811 


1,430 


2,930 


1,500 


21 


44 


82 


169 


253 


487 


777 


1,370 


2,800 


1,600 


20 


42 


79 


162 


243 


468 


746 


1,320 


2,690 


1,700 


19 


40 


76 


156 


234 


451 


719 


1,270 


2,590 


1,800 


19 


39 


74 


151 


226 


436 


694 


1,230 


2,500 


1,900 


18 


38 


71 


146 


219 


422 


672 


1,190 


2,420 


2,000 


18 


37 


69 


142' 


212 


409 


652 


1,150 


2,350 



For SI: 1 inch = 25.4 mm, 1 foot = 304.S 

1 British thermal unit per hour = 

Note: All table entries have been rounded 



i mm, 1 pound per square inch = 6, 
0.2931 W, 1 cubic foot per hour = 
to three significant digits. 



895 kPa, 1-inch water column = 0.2488 
0.0283 m^/h, 1 degree = 0.01745 rad. 



kPa, 



2006 INTERNATIONAL FUEL GAS CODE® 



55 



GAS PIPING INSTALLATIONS 





Gas 


Undiluted Propane 


TABLE 402.4(27) 
SEMIRIGID COPPER TUBING 


Inlet Pressure 


10.0 psi 


Pressure Drop 


1 .0 psi 




Specific Gravity 


1.50 


SPECIAL USE 


Sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator). 


TUBE SIZE (in.) 


Nominal 


K&L 


V4 


Vs 


V2 


■ ^8 


% 


1 


1V4 


IV2 


2 


ACR 


^/8 


V2 


% 


% 


'h 


iVs 


1%- 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


513 


1,060 


2,150 


3,760 


5,330 


11,400 


20,500 


32,300 


67,400 


20 


352 


727 


1,480 


2,580 


3,670 


7,830 


14,100 


22,200 


46,300 


30 


283 


584 


1,190 


2,080 


2,940 


6,290 


11,300 


17,900 


37,200 


40 


242 


500 


1,020 


1,780 


2,520 


5,380 


9,690 


15,300 


31,800 


50 


215 


443 


901 


1,570 


2,230 


4,770 


8,590 


13,500 


28,200 


60 


194 


401 


816 


1,430 


2,020 


4,320 


7,780 


12,300 


25,600 


70 


179 


369 


751 


1,310 


1,860 


3,980 


7,160 


11,300 


23,500 


80 


166 


343 


699 


1,220 


1,730 


3,700 


6,660 


10,500 


21,900 


90 


156 


322 


655 


1,150 


1,630 


3,470 


6,250 


9,850 


20,500 


100 


147 


304 


619 


1,080 


1,540 


3,280 


5,900 


9,310 


19,400 


125 


131 


270 


549 


959 


1,360 


2,910 


5,230 


8,250 


17,200 


150 


118 


244 


497 


869 


1,230 


2,630 


4,740 


7,470 


15,600 


175 


109 


225 


457 


799 


1,130 


2,420 


4,360 


6,880 


14,300 


200 


101 


209 


426 


744 


1,060 


2,250 


4,060 


6,400 


13,300 


250 


90 


185 


377 


659 


935 


2,000 


3,600 


5,670 


11,800 


300 


81 


168 


342 


597 


847 


1,810 


3,260 


5,140 


10,700 


350 


75 


155 


314 


549 


779 


1,660 


3,000 


4,730 


9,840 


400 


70 


144 


292 


511 


725 


1,550 


2,790 


4,400 


9,160 


450 


65 


135 


274 


480 


680 


1,450 


2,620 


4,130 


8,590 


500 


62 


127 


259 


453 


643 


1,370 


2,470 


3,900 


8,120 


550 


59 


121 


246 


430 


610 


1,300 


2,350 


3,700 


7,710 


600 


56 


115 


235 


410 


582 


1,240 


2,240 


3,530 


7,350 


650 


54 


111 


225 


393 


558 


1,190 


2,140 


3,380 


7,040 


700 


51 


106 


216 


378 


536 


1,140 


2,060 


3,250 


6,770 


750 


50 


102 


208 


364 


516 


1,100 


1,980 


3,130 


6,520 


800 


48 


99 


201 


351 


498 


1,060 


1,920 


3,020 


6,290 


850 


46 


96 


195 


340 


482 


1,030 


1,850 


2,920 


6,090 


900 


45 


93 


189 


330 


468 


1,000 


1,800 


2,840 


5,910 


950 


44 


90 


183 


320 


454 


970 


1,750 


2,750 


5,730 


1,000 


42 


88 


178 


311 


442 


944 


1,700 


2,680 


5,580 


1,100 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


1,200 


38 


79 


161 


282 


400 


855 


1,540 


2,430 


5,050 


1,300 


37 


76 


155 


270 


383 


819 


1,470 


2,320 


4,840 


1,400 


35 


73 


148 


260 


368 


787 


1,420 


2,230 


4,650 


1,500 


34 


70 


143 


250 


355 


758 


1,360 


2,150 


4,480 


1,600 


33 


68 


138 


241 


343 


732 


1,320 


2,080 


4,330 


1,700 


32 


66 


134 


234 


331 


708 


1,270 


2,010 


4,190 


1,800 


31 


64 


130 


227 


321 


687 


1,240 


1,950 


4,060 


1,900 


30 


62 


126 


220 


312 


667 


1,200 


1,890 


3,940 


2,000 


29 


60 


122 


214 


304 


648 


1,170 


1,840 


3,830 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



56 



2006 INTERNATIONAL FUEL GAS CODE'^ 



GAS PIPING INSTALLATIONS 



TABLE 402.4(28) 
SEMIRIGID COPPER TUBING 



Gas 


Undiluted Propane 


Inlet Pressure 


11.0in. w.c. 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


1.50 



SPECIAL USE 


Sizing between first stage (liigh-pressure regulator) and second stage (low-pressure regulator) 


TUBE SIZE (in.) 


Nominal 


K&L 


% 


Vs 


V2 


^8 


'U 


1 


IV4 


IV2 


2 


ACR 


\ 


\ 


% 


\ 


Vs 


iVg 


1% 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


45 


93 


188 


329 


467 


997 


1,800 


2,830 


5,890 


20 


31 


64 


129 


226 


321 


685 


1,230 


1,950 


4,050 


30 


25 


51 


104 


182 


258 


550 


991 


1,560 


3,250 


40 


21 


44 


89 


155 


220 


471 


848 


1,340 


2,780 


50 


19 


39 


79 


138 


195 


417 


752 


1,180 


2,470 


60 


17 


35 


71 


125 


177 


378 


681 


1,070 


2,240 


70 


16 


32 


66 


115 


163 


348 


626 


988 


2,060 


80 


15 


30 


61 


107 


152 


324 


583 


919 


1,910 


90 


14 


28 


57 


100 


142 


304 


547 


862 


1,800 


100 


13 


27 


54 


95 


134 


287 


517 


814 


1,700 


125 


11 


24 


48 


84 


119 


254 


458 


722 


1,500 


150 


10 


21 


44 


76 


108 


230 


415 


654 


1,360 


175 


NA 


20 


40 


70 


99 


212 


382 


602 


1,250 


200 


NA 


18 


37 


65 


92 


197 


355 


560 


1,170 


250 


NA 


16 


33 


58 


82 


175 


315 


496 


1,030 


300 


NA 


15 


30 


52 


74 


158 


285 


449 


936 


350 


NA 


14 


28 


48 


68 


146 


262 


414 


861 


400 


NA 


13 


26 


45 


63 


136 


244 


385 


801 


450 


NA 


12 


24 


42 


60 


127 


229 


361 


752 


500 


NA 


11 


23 


40 


56 


120 


216 


341 


710 


550 


NA 


11 


22 


38 


53 


114 


205 


324 


674 


600 


NA 


10 


21 


36 


51 


109 


196 


309 


643 


650 


NA 


NA 


20 


34 


49 


104 


188 


296 


616 


700 


NA 


NA 


19 


33 


47 


100 


180 


284 


592 


750 


NA 


NA 


18 


32 


45 


96 


174 


274 


570 


800 


NA 


NA 


18 


31 


44 


93 


168 


264 


551 


850 


NA 


NA 


17 


30 


42 


90 


162 


256 


533 


900 


NA 


NA 


17 


29 


41 


87 


157 


248 


517 


950 


NA 


NA 


16 


28 


40 


85 


153 


241 


502 


1,000 


NA 


NA 


16 


27 


39 


83 


149 


234 


488 


1,100 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


1,200 


NA 


NA 


14 


25 


35 


75 


135 


212 


442 


1,300 


NA 


NA 


14 


24 


34 


72 


129 


203 


423 


1,400 


NA 


NA 


13 


23 


32 


69 


124 


195 


407 


1,500 


NA 


NA 


13 


22 


31 


66 


119 


188 


392 


1,600 


NA 


NA 


12 


21 


30 


64 


115 


182 


378 


1,700 


NA 


NA 


12 


20 


29 


62 


112 


176 


366 


1,800 


NA 


NA 


11 


20 


28 


60 


108 


170 


355 


1,900 


NA 


NA 


11 


19 


27 


58 


105 


166 


345 


2,000 


NA 


NA 


11 


19 


27 


57 


102 


161 


335 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, l-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. NA means a flow of less than 10,000 Btu/hr. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



57 



GAS PIPING INSTALLATIONS 





TABLE 402.4(29) 
SEMIRIGID COPPER TUBING 




Gas 


Undiluted Propane 




Inlet Pressure 


2.0 psi 




Pressure Drop 


1 .0 psi 




Specific Gravity 


1.50 












TUBE SIZE (in.) 


Nominal 


K&L 


V4 


% 


% 


% 


% 


1 


IV4 


IV, 


2 


ACR 


% 


'/2 


% 


% 


\ 


iVs 


1^/8 








Outside 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


413 


852 


1,730 


3,030 


4,300 


9,170 


16,500 


26,000 


54,200 


20 


284 


585 


1,190 


2,080 


2,950 


6,310 


11,400 


17,900 


37,300 


30 


228 


470 


956 


1,670 


2,370 


5,060 


9,120 


14,400 


29,900 


40 


195 


402 


818 


1,430 


2,030 


4,330 


7,800 


12,300 


25,600 


50 


173 


356 


725 


1,270 


1,800 


3,840 


6,920 


10,900 


22,700 


60 


157 


323 


657 


1,150 


1,630 


3,480 


6,270 , 


9,880 


20,600 


70 


144 


297 


605 


1,060 


1,500 


3,200 


5,760 


9,090 


18,900 


80 


134 


276 


562 


983 


1,390 


2,980 


5,360 


8,450 


17,600 


90 


126 


259 


528 


922 


1,310 


2,790 


5,030 


7,930 


16,500 


100 


119 


245 


498 


871 


1,240 


2,640 


4,750 


7,490 


15,600 


125 


105 


217 


442 


772 


1,100 


2,340 


4,210 


6,640 


13,800 


150 


95 


197 


400 


700 


992 


2,120 


3,820 


6,020 


12,500 


175 


88 


181 


368 


644 


913 


1,950 


3,510 


5,540 


11,500 


200 


82 


168 


343 


599 


849 


1,810 


3,270 


5,150 


10,700 


250 


72 


149 


304 


531 


753 


1,610 


2,900 


4,560 


9,510 


300 


66 


135 


275 


481 


682 


1,460 


2,620 


4,140 


8,610 


350 


60 


124 


253 


442 ' 


628 


1,340 


2,410 


3,800 


7,920 


400 


56 


116 


235 


411 


584 


1,250 


2,250 


3,540 


7,370 


450 


53 


109 


221 


386 


548 


1,170 


2,110 


3,320 


6,920 


500 


50 


103 


209 


365 


517 


1,110 


1,990 


3,140 


6,530 


550 


47 


97 


198 


346 


491 


1,050 


1,890 


2,980 


6,210 


600 


45 


93 


189 


330 


469 


1,000 


1,800 


2,840 


5,920 


650 


43 


89 , 


181 


316 


449 


959 


1,730 


2,720 


5,670 


700 


41 


86 


174 


304 


431 


921 


1,660 


2,620 


5,450 


750 


40 


82 


168 


293 


415 


888 


1,600 


2,520 


5,250 


800 


39 


80 


162 


283 


401 


857 


1,540 


2,430 


5,070 


850 


37 


77 


157 


274 


388 


829 


1,490 


2,350 


4,900 


900 


36 


75 


152 


265 


376 


804 


1,450 


2,280 


4,750 


950 


35 


72 


147 


258 


366 


781 


1,410 


2,220 


4,620 


1,000 


34 


71 


143 


251 


356 


760 


1,370 


2,160 


4,490 


1,100 


32 


67 


136 


238 


338 


721 


1,300 


2,050 


4,270 


1,200 


31 


64 


130 


227 


322 


688 


1,240 


1,950 


4,070 


1,300 


30 


61 


124 


217 


309 


659 


1,190 


1,870 


3,900 


1,400 


28 


59 


120 


209 


296 


633 


1,140 


1,800 


3,740 


1,500 


27 


57 


115 


201 


286 


610 


1,100 


1,730 


3,610 


1,600 


26 


55 


111 


194 


276 


589 


1,060 


1,670 


3,480 


1,700 


26 


53 


108 


188 


267 


570 


1,030 


1,620 


3,370 


1,800 


25 


51 


104 


182 


259 


553 


1,000 


1,570 


3,270 


1,900 


24 


50 


101 


177 


251 


537 


966 


1,520 


3,170 


2,000 


23 


48 


99 


172 


244 


522 


940 


1,480 


3,090 



For SI: 



Notes: 



1 inch - 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column - 0.2488 kPa, 
1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m'/h, 1 degree = 0.01745 rad. 



1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products. 

2. All table entries have been rounded to three significant digits. 



58 



2006 INTERNATIONAL FUEL GAS CODE^ 



GAS PIPING INSTALLATIONS 





Gas I 


Jndiluted Propane 


TABLE 402.4(30) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 


1.0in. w.c. 


Pressure Drop ( 


3.5 in. w.c. 




Specific Gravity 


.50 






TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Lengtii (ft) 


Capacity in Thousands of Btu per Hour 


5 


72 


99 


181 


211 


355 


426 


744 


863 


1,420 


2,830 


3,270 


5,780 


6,550 


10 


50 


69 


129 


150 


254 


303 


521 


605 


971 


1,990 


2,320 


4,110 


4,640 


15 


39 


55 


104 


121 


208 


248 


422 


490 


775 


1,620 


1,900 


3,370 


3,790 


20 


34 


49 


91 


106 


183 


216 


365 


425 


661 


1,400 


1,650 


2,930 


3,290 


25 


30 


42 


82 


94 


164 


192 


325 


379 


583 


1,250 


1,480 


2,630 


2,940 


30 


28 


39 


74 


87 


151 


177 


297 


344 


528 


1,140 


1,350 


2,400 


2,680 


40 


23 


33 


64 


74 


131 


153 


256 


297 


449 


988 


1,170 


2,090 


2,330 


50 


20 


30 


58 


66 


118 


137 


227 


265 


397 


884 


1,050 


1,870 


2,080 


60 


19 


26 


53 


60 


107 


126 


207 


241 


359 


805 


961 


1,710 


1,900 


70 


17 


25 


49 


57 


99 


117 


191 


222 


330 


745 


890 


1,590 


1,760 


80 


15 


23 


45 


52 


94 


109 


178 


208 


307 


696 


833 


1,490 


1,650 


90 


15 


22 


44 


50 


90 


102 


169 


197 


286 


656 


787 


1,400 


1,550 


100 


14 


20 


41 


47 


85 


98 


159 


186 


270 


621 


746 


1,330 


1,480 


150 


11 


15 


31 


36 


66 


75 


123 


143 


217 


506 


611 


1,090 


1,210 


200 


9 


14 


28 


33 


60 


69 


112 


129 


183 


438 


531 


948 


1,050 


250 


8 


12 


25 


30 


53 


61 


99 


117 


163 


390 


476 


850 


934 


300 


8 


11 


23 


26 


50 


57 


90 


107 


147 


357 


434 


111 


854 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L=\3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

2. EHD — ^Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

3. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



59 



GAS PIPING INSTALLATIONS 





Gas I 


Jndiluted Propane 


TABLE 402.4(31) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure '•. 


>.0 psi 


Pressure Drop 


.Opsi 




Specific Gravity 


.50 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity In Thousands of Btu per Hour 


10 


426 


558 


927 


1,110 


1,740 


2,170 


4,100 


4,720 


7,130 


15,200 


16,800 


29,400 


34,200 


25 


262 


347 


591 


701 


1,120 


1,380 


2,560 


2,950 


4,560 


9,550 


10,700 


18,800 


21,700 


30 


238 


316 


540 


640 


1,030 


1,270 


2,330 


2,690 


4,180 


8,710 


9,790 


17,200 


19,800 


40 


203 


271 


469 


554 


896 


1,100 


2,010 


2,320 


3,630 


7,530 


8,500 


14,900 


17,200 


50 


181 


243 


420 


496 


806 


986 


1,790 


2,070 


3,260 


6,730 


7,610 


13,400 


15,400 


75 


147 


196 


344 


406 


663 


809 


1,460 


1,690 


2,680 


5,480 


6,230 


11,000 


12,600 


80 


140 


189 


333 


393 


643 


768 


1,410 


1,630 


2,590 


5,300 


6,040 


10,600 


12,200 


100 


124 


169 


298 


350 


578 


703 


1,260 


1,450 


2,330 


4,740 


5,410 


9,530 


10,900 


150 


101 


137 


245 


287 


477 


575 


1,020 


1,180 


1,910 


3,860 


4,430 


7,810 


8,890 


200 


86 


118 


213 


248 


415 


501 


880 


1,020 


1,660 


3,340 


3,840 


6,780 


7,710 


250 


77 


105 


191 


222 


373 


448 


785 


910 


1,490 


2,980 


3,440 


6,080 


6,900 


300 


69 


96 


173 


203 


343 


411 


716 


829 


1,360 


2,720 


3,150 


5,560 


6,300 


400 


60 


82 


151 


175 


298 


355 


616 


716 


1,160 


2,350 


2,730 


4,830 


5,460 


500 


53 


72 


135 


158 


268 


319 


550 


638 


1,030 


2,100 


2,450 


4,330 


4,880 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Notes: 

1. Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds V2 psi (based on 13 in. w.c. outlet pressure), DO NOT USE 
THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator may vary with flow rate. 

2. CAUTION: Capacities shown in the table may exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



60 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 





Gas 


Jndiluted Propane 


TABLE 402.4(32) 
CORRUGATED STAINLESS STEEL TUBING (CSST) 


Inlet Pressure 


5.0 psi 


Pressure Drop 


3.5 psi 




Specific Gravity 


.50 


TUBE SIZE (EHD) 


Flow 
Designation 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity In Thousands of Btu per Hour 


10 


826 


1,070 


1,710 


2,060 


3,150 


4,000 


7,830 


8,950 


13,100 


28,600 


31,200 


54,400 


63,800 


25 


509 


664 


1,090 


1,310 


2,040 


2,550 


4,860 


5,600 


8,400 


18,000 


19,900 


34,700 


40,400 


30 


461 


603 


999 


1,190 


1,870 


2,340 


4,430 


5,100 


7,680 


16,400 


18,200 


31,700 


36,900 


40 


396 


520 


867 


1,030 


1,630 


2,030 


3,820 


4,400 


6,680 


14,200 


15,800 


27,600 


32,000 


50 


352 


463 


777 


926 


1,460 


1,820 


3,410 


3,930 


5,990 


12,700 


14,100 


24,700 


28,600 


75 


284 


376 


637 


757 


1,210 


1,490 


2,770 


3,190 


4,920 


10,300 


11,600 


20,300 


23,400 


80 


275 


363 


618 


731 


1,170 


1,450 


2,680 


3,090 


4,770 


9,990 


11,200 


19,600 


22,700 


100 


243 


324 


553 


656 


1,050 


1,300 


2,390 


2,760 


4,280 


8,930 


10,000 


17,600 


20,300 


150 


196 


262 


453 


535 


866 


1,060 


1,940 


2,240 


3,510 


7,270 


8,210 


14,400 


16,600 


200 


169 


226 


393 


464 


755 


923 


1,680 


1,930 


3,050 


6,290 


7,130 


12,500 


14,400 


250 


150 


202 


352 


415 


679 


828 


1,490 


1,730 


2,740 


5,620 


6,390 


11,200 


12,900 


300 


136 


183 


322 


379 


622 


757 


1,360 


1,570 


2,510 


5,120 


5,840 


10,300 


11,700 


400 


117 


158 


279 


328 


542 


657 


1,170 


1,360 


2,180 


4,430 


5,070 


8,920 


10,200 


500 


104 


140 


251 


294 


488 


589 


1,050 


1,210 


1,950 


3,960 


4,540 


8,000 


9,110 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m%, 1 degree = 0.01745 rad. 
Notes: 

1. Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with the regulator 
manufacturer for pressure drops and capacity factors. Pressure drop across regulator may vary with the flow rate. 

2. CAUTION: Capacities shown in the table may exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance. 

3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/or fittings shall be increased by an equivalent 
length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings and/or bends. 

4. EHD — Equivalent HydrauHc Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the 
greater the gas capacity of the tubing. 

5. All table entries have been rounded to three significant digits. 



2006 INTERNATIONAL FUEL GAS CODE® 



61 



GAS PIPING INSTALLATIONS 





TABLE 402.4(33) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Undiluted Propane 






Inlet Pressure 


11.0in. w.c. 






Pressure Drop 


0.5 in. w.c. 






Specific Gravity 


1.50 


PIPE SIZE (in.) 


Nominal OD 


% 


% 


1 


IV4 


IV2 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Thousands of Btu per hlour 


10 


340 


680 


1,230 


2,130 


3,210 


5,770 


20 


233 


468 


844 


1,460 


2,210 


3,970 


30 


187 


375 


677 


1,170 


1,770 


3,180 


40 


160 


321 


580 


1,000 


1,520 


2,730 


50 


142 


285 


514 


890 


1,340 


2,420 


60 


129 


258 


466 


807 


1,220 


2,190 


70 


119 


237 


428 


742 


1,120 


2,010 


80 


110 


221 


398 


690 


1,040 


1,870 


90 


103 


207 


374 


648 


978 


1,760 


100 


98 


196 


353 


612 


924 


1,660 


125 


87 


173 


313 


542 


819 


1,470 


150 


78 


157 


284 


491 


742 


1,330 


175 


72 


145 


261 


452 


683 


1,230 


200 


67 


135 


243 


420 


635 


1,140 


250 


60 


119 


215 


373 


563 


1,010 


300 


54 


108 


195 


338 


510 


916 


350 


50 


99 


179 


311 


469 


843 


400 


46 


92 


167 


289 


436 


784 


450 


43 


87 


157 


271 


409 


736 


500 


41 


82 


148 


256 


387 


695 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m^/h, 1 degree = 0.01745 rad. 
Note: All table entries have been rounded to three significant digits. 



62 



2006 INTERNATIONAL FUEL GAS CODE^ 



GAS PIPING INSTALLATIONS 





TABLE 402.4(34) 
POLYETHYLENE PLASTIC PIPE 




Gas 


Undiluted Propane 






Inlet Pressure 


2.0 psi 






Pressure Drop 


1 .0 psi 






Specific Gravity 


1.50 








PIPE SIZE (In.) 


Nominal OD 


V2 


V4 


1 


IV4 


1V2 


2 


Designation 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


3,130 


6,260 


11,300 


19,600 


29,500 


53,100 


20 


2,150 


4,300 


7,760 


13,400 


20,300 


36,500 


30 


1,730 


3,450 


6,230 


10,800 


16,300 


29,300 


40 


1,480 


2,960 


5,330 


9,240 


14,000 


25,100 


50 


1,310 


2,620 


4,730 


8,190 


12,400 


22,200 


60 


1,190 


2,370 


4,280 


7,420 


11,200 


20,100 


70 


1,090 


2,180 


3,940 


6,830 


10,300 


18,500 


80 


1,010 


2,030 


3,670 


6,350 


9,590 


17,200 


90 


952 


1,910 


3,440 


5,960 


9,000 


16,200 


100 


899 


1,800 


3,250 


5,630 


8,500 


15,300 


125 


797 


1,600 


2,880 


4,990 


7,530 


13,500 


150 


722 


1,450 


2,610 


4,520 


6,830 


12,300 


175 


664 


1,330 


2,400 


4,160 


6,280 


11,300 


200 


618 


1,240 


2,230 


3,870 


5,840 


10,500 


250 


548 


1,100 


1,980 


3,430 


5,180 


9,300 


300 


496 


994 


1,790 


3,110 


4,690 


8,430 


350 


457 


914 


1,650 


2,860 


4,320 


7,760 


400 


425 


851 


1,530 


2,660 


4,020 


7,220 


450 


399 


798 


1,440 


2,500 


3,770 


6,770 


500 


377 


754 


1,360 


2,360 


3,560 


6,390 


550 


358 


716 


1,290 


2,240 


3,380 


6,070 


600 


341 


683 


1,230 


2,140 


3,220 


5,790 


650 


327 


654 


1,180 


2,040 


3,090 


5,550 


700 


314 


628 


1,130 


1,960 


2,970 


5,330 


750 


302 


605 


1,090 


1,890 


2,860 


5,140 


800 


292 


585 


1,050 


1,830 


2,760 


4,960 


850 


283 


566 


1,020 


1,770 


2,670 


4,800 


900 


274 


549 


990 


1,710 


2,590 


4,650 


950 


266 


533 


961 


1,670 


2,520 


4,520 


1,000 


259 


518 


935 


1,620 


2,450 


4,400 


1,100 


246 


492 


888 


1,540 


2,320 


4,170 


1,200 


234 


470 


847 


1,470 


2,220 


3,980 


1,300 


225 


450 


811 


1,410 


2,120 


3,810 


1,400 


216 


432 


779 


1,350 


2,040 


3,660 


1,500 


208 


416 


751 


1,300 


1,960 


3,530 


1,600 


201 


402 


725 


1,260 


1,900 


3,410 


1,700 


194 


389 


702 


1,220 


1,840 


3,300 


1,800 


188 


377 


680 


1,180 


1,780 


3,200 


1,900 


183 


366 


661 


1,140 


1,730 


3,110 


2,000 


178 


356 


643 


1,110 


1,680 


3,020 



For SI: 1 inch = 25.4 mm, 1 foot = 304. 

1 British thermal unit per hour = 

Note: All table entries have been rounded to 



8 mm, 1 pound per square inch = 6. 
: 0.2931 W, 1 cubic foot per hour = 
three significant digits. 



895 kPa, 1-inch water 
0.0283 m'/h, 1 degree 



column = 0.2488 kPa, 
= 0.01745 rad. 



2006 INTERNATIONAL FUEL GAS CODE® 



63 



GAS PIPING INSTALLATIONS 



TABLE 402.4(35) 
POLYETHYLENE PLASTIC TUBING 



Gas 


Undiluted Propane 


Inlet Pressure 


1 1 .0 in. w.c. 


Pressure Drop 


0.5 in. w.c. 


Specific Gravity 


1.50 






Plastic Tubing Size (CTS) (in.) 


Nominal OD 


\ 


% 


Designation 


SDR 7.00 


SDR 11.00 


Actual ID 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


121 


828 


20 


83 


569 


30 


67 


457 


40 


57 


391 


50 


51 


347 


60 


46 


314 


70 


42 


289 


80 


39 


269 


90 


37 


252 


100 


35 


238 


125 


31 


211 


150 


28 


191 


175 


26 


176 


200 


24 


164 


225 


22 


154 


250 


21 


145 


275 


20 


138 


300 


19 


132 


350 


18 


121 


400 


16 


113 


450 


15 


106 


500 


15 


100 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 

1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 

1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour - 0.0283 ml\\, 

1 degree = 0.01745 rad. 



SECTION 403 (IFGS) 
PIPING MATERIALS 

403.1 General. Materials used for piping systems shall comply 
with the requirements of this chapter or shall be approved. 

403.2 Used materials. Pipe, fittings, valves and other materi- 
als shall not be used again except w^here they are free of foreign 
materials and have been ascertained to be adequate for the ser- 
vice intended. 



403.3 Other materials. Material not covered by the standards 
specifications listed herein shall be investigated and tested to 
determine that it is safe and suitable for the proposed service, 
and, in addition, shall be recommended for that service by the 
manufacturer and shall be approved by the code official. 

403.4 Metallic pipe. Metallic pipe shall comply with Sections 
403.4.1 through 403.4.4. 

403.4.1 Cast iron. Cast-iron pipe shall not be used. 

403.4.2 Steel. Steel and wrought-iron pipe shall be at least 
of standard weight (Schedule 40) and shall comply with one 
of the following standards: 

1. ASME B 36.10, lOM; 

2. ASTM A 53; or 

3. ASTM A 106. 

403.4.3 Copper and brass. Copper and brass pipe shall not 
be used if the gas contains more than an average of 0.3 
grains of hydrogen sulfide per 100 standard cubic feet of gas 
(0.7 milligrams per 100 liters). Threaded copper, brass and 
aluminum-alloy pipe shall not be used with gases corrosive 
to such materials. 

403.4.4 Aluminum. Aluminum-alloy pipe shall comply with 
ASTM B 241 (except that the use of alloy 5456 is prohibited), 
and shall be marked at each end of each length indicating 
compliance. Aluminum-alloy pipe shall be coated to protect 
against external corrosion where it is in contact with masonry, 
plaster, or insulation, or is subject to repeated wettings by 
such Uquids as water, detergents, or sewage. Aluminum-alloy 
pipe shall not be used in exterior locations or underground. 

403.5 Metallic tubing. Seamless copper, aluminum alloy and 
steel tubing shall not be used with gases corrosive to such mate- 
rials. 

403.5.1 Steel tubing. Steel tubing shall comply with ASTM 
A 254 or ASTM A 539. 

403.5.2 Copper and brass tubing. Copper tubing shall 
comply with Standard Type K or L of ASTM B 88 or ASTM 
B280. 

Copper and brass tubing shall not be used if the gas con- 
tains more than an average of 0.3 grains of hydrogen sulfide 
per 100 standard cubic feet of gas (0.7 milligrams per 100 
liters). 

403.5.3 Aluminum tubing. Aluminum-alloy tubing shall 
comply with ASTM B 210 or ASTM B 241. Alumi- 
num-alloy tubing shall be coated to protect against external 
corrosion where it is in contact with masonry, plaster or 
insulation, or is subject to repeated wettings by such liquids 
as water, detergent or sewage. 

Aluminum-alloy tubing shall not be used in exterior loca- 
tions or underground. 

403.5.4 Corrugated stainless steel tubing. Corrugated I 
stainless steel tubing shall be listed in accordance with I 
ANSI LC 1/CSA 6.26. ' 

403.6 Plastic pipe, tubing and fittings. Plastic pipe, tubing 
and fittings used to supply fuel gas shall be used outdoors, I 



64 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 



underground, only, and shall conform to ASTM D 2513. Pipe 
shall be marked "Gas" and "ASTM D 2513." 

403.6.1 Anodeless risers. Plastic pipe, tubing and 
anodeless risers shall comply with the following: 

1. Factory-assembled anodeless risers shall be recom- 
mended by the manufacturer for the gas used and shall 
be leak tested by the manufacturer in accordance with 
written procedures. 

2. Service head adapters and field-assembled anodeless 
risers incorporating service head adapters shall be 
recommended by the manufacturer for the gas used, 
and shall be designed and certified to meet the 
requirements of Category I of ASTM D 2513, and 
U.S. Department of Transportation, Code of Federal 
Regulations, Title 49, Part 192.281(e). The manufac- 
turer shall provide the user with qualified installation 
instructions as prescribed by the U.S. Department of 
Transportation, Code of Federal Regulations, Title 
49, Part 192.283(b). 

403.6.2 LP-gas systems. The use of plastic pipe, tubing and 
fittings in undiluted liquefied petroleum gas piping systems 
shall be in accordance with NFPA 58. 

403.6.3 Regulator vent piping. Plastic pipe, tubing and fit- 
tings used to connect regulator vents to remote vent termina- 
tions shall be PVC conforming to UL 65 1 . PVC vent piping 
shall not be installed indoors. 

403.7 Workmanship and defects. Pipe, tubing and fittings 
shall be clear and free from cutting burrs and defects in struc- 
ture or threading, and shall be thoroughly brushed, and chip 
and scale blown. 

Defects in pipe, tubing and fittings shall not be repaired. 
Defective pipe, tubing and fittings shall be replaced (see Sec- 
tion 406.1.2). 

403.8 Protective coating. Where in contact with material or 
atmosphere exerting a corrosive action, metallic piping and fit- 
tings coated with a corrosion-resistant material shall be used. 
External or internal coatings or linings used on piping or com- 
ponents shall not be considered as adding strength. 

403.9 Metallic pipe threads. MetalMc pipe and fitting threads 
shall be taper pipe threads and shall comply with ASME B 1 .20. 1 . 

403.9.1 Damaged threads. Pipe with threads that are 
stripped, chipped, corroded or otherwise damaged shall not 
be used. Where a weld opens during the operation of cutting 
or threading, that portion of the pipe shall not be used. 

403.9.2 Number of threads. Field threading of metallic 
pipe shall be in accordance with Table 403.9.2. 

403.9.3 Thread compounds. Thread (joint) compounds 
(pipe dope) shall be resistant to the action of liquefied petro- 
leum gas or to any other chemical constituents of the gases 
to be conducted through the piping. 

403.10 Metallic piping joints and fittings. The type of piping 
joint used shall be suitable for the pressure-temperature condi- 
tions and shall be selected giving consideration to joint tight- 
ness and mechanical strength under the service conditions. The 
joint shall be able to sustain the maximum end force caused by 



the internal pressure and any additional forces caused by tem- 
perature expansion or contraction, vibration, fatigue or the 
weight of the pipe and its contents. 

TABLE 403.9.2 
SPECIFICATIONS FOR THREADING METALLIC PIPE 



IRON PIPE SIZE 
(inches) 


APPROXIMATE LENGTH OF 
THREADED PORTION (Inches) 


APPROXIMATE NUMBER 
OF THREADS TO BE CUT 


% 


% 


10 


% 


'U 


10 


1 


y. 


10 


IV4 


1 


11 


1% 


1 


11 


2 


1 


11 


2\ 


IV, 


12 


3 


IV, 


12 


4 


1% 


13 



For SI: 1 inch = 25.4 mm. 

403.10.1 Pipe joints. Pipe joints shall be threaded, flanged, 
brazed or welded. Where nonferrous pipe is brazed, the 
brazing materials shall have a melting point in excess of 
1,000°F (538°C). Brazing alloys shall not contain more than 
0.05-percent phosphorus. 

403.10.2 Tlibing joints. Tubing joints shall be either made 
with approved gas tubing fittings or brazed with a material 
having a melting point in excess of 1 ,000°F (538°C). Brazing 
aUoys shall not contain more than 0.05-percent phosphorus. 

403.10.3 Flared joints. Flared joints shall be used only in 
systems constructed from nonferrous pipe and tubing where 
experience or tests have demonstrated that the joint is suit- 
able for the conditions and where provisions are made in the 
design to prevent separation of the joints. 

403.10.4 MetaUic fittings. MetalUc fittings shall comply 
with the following: 

1. Threaded fittings in sizes larger than 4 inches (102 
mm) shall not be used except where approved. 

2. Fittings used with steel or wrought-iron pipe shall be 
steel, brass, bronze, malleable iron or cast iron. 

3. Fittings used with copper or brass pipe shall be cop- 
per, brass or bronze. 

4. Fittings used with aluminum-alloy pipe shall be of 
aluminum alloy. 

5. Cast-iron fittings: 

5.1. Flanges shall be permitted. 

5.2. Bushings shall not be used. 

5.3. Fittings shall not be used in systems contain- 
ing flammable gas-air mixtures. 

5.4. Fittings in sizes 4 inches (102 mm) and larger 
shall not be used indoors except where ap- 
proved. 



2006 INTERNATIONAL FUEL GAS CODE^ 



65 



GAS PIPING INSTALLATIONS 



5.5. Fittings in sizes 6 inches (152 mm) and larger 
shall not be used except where approved. 

6. Aluminum-alloy fittings. Threads shall not form the 
joint seal. 

7. Zinc aluminum-alloy fittings. Fittings shall not be 
used in systems containing flammable gas-air mix- 
tures. 

8. Special fittings. Fittings such as couplings, propri- 
etary-type joints, saddle tees, gland-type compres- 
sion fittings, and flared, flareless or 
compression-type tubing fittings shall be: used within 
the fitting manufacturer's pressure-temperature rec- 
ommendations; used within the service conditions 
anticipated with respect to vibration, fatigue, thermal 
expansion or contraction; installed or braced to pre- 
vent separation of the joint by gas pressure or external 
physical damage; and shall be approved. 

403.11 Plastic pipe, joints and fittings. Plastic pipe, tubing 
and fittings shall be joined in accordance with the manufactur- 
er's instructions. Such joint shall comply with the following: 

1 . The j oint shall be designed and installed so that the longi- 
tudinal pull-out resistance of the joint will be at least 
equal to the tensile strength of the plastic piping material. 

2. Heat-fusion joints shall be made in accordance with 
qualified procedures that have been established and 
proven by test to produce gas-tight joints at least as 
strong as the pipe or tubing being joined. Joints shall be 
made with the joining method recommended by the pipe 
manufacturer. Heat fusion fittings shall be marked 
"ASTMD2513." 

3. Where compression-type mechanical joints are used, the 
gasket material in the fitting shall be compatible with the 
plastic piping and with the gas distributed by the system. 
An internal tubular rigid stiffener shall be used in con- 
junction with the fitting. The stiffener shall be flush with 
the end of the pipe or tubing and shall extend at least to 
the outside end of the compression fitting when installed. 
The stiffener shall be free of rough or sharp edges and 
shall not be a force fit in the plastic. Split tubular stiff en- 
ers shall not be used. 

4. Plastic piping joints and fittings for use in Uquefied pe- 
troleum gas piping systems shall be in accordance with 
NFPA 58. 

403.12 Flanges. All flanges shall comply with ASME B16.1, 
ASME B 16.20 or MSS SP-6. The pressure-temperature ratings 
shall equal or exceed that required by the application. 

403.12.1 Flange facings. Standard facings shall be permit- 
ted for use under this code. Where 150-pound (1034 kPa) 
pressure-rated steel flanges are bolted to Class 125 cast-iron 
flanges, the raised face on the steel flange shall be removed. 

403.12.2 Lapped flanges. Lapped flanges shall be used 
only above ground or in exposed locations accessible for in- 
spection. 

403.13 Flange gaskets. Material for gaskets shall be capable of 
withstanding the design temperature and pressure of the piping 
system, and the chemical constituents of the gas being con- 



ducted, without change to its chemical and physical properties. 
The effects of fire exposure to the joint shall be considered in 
choosing material. Acceptable materials include metal or 
metal-jacketed asbestos (plain or corrugated), asbestos, and 
aluminum "O" rings and spiral wound metal gaskets. When a 
flanged joint is opened, the gasket shall be replaced. Full-face 
gaskets shall be used with all bronze and cast-iron flanges. 



SECTION 404 (IFGC) 
PIPING SYSTEM INSTALLATION 

404.1 Prohibited locations. Piping shall not be installed in or 
through a circulating air duct, clothes chute, chimney or gas 
vent, ventilating duct, dumbwaiter or elevator shaft. Piping I 
installed downstream of the point of delivery shall not extend I 
through any townhouse unit other than the unit served by such | 
piping. 

404.2 Piping in solid partitions and walls. Concealed piping 
shall not be located in solid partitions and solid walls, unless in- 
stalled in a chase or casing. 

404.3 Piping in concealed locations. Portions of a piping sys- 
tem installed in concealed locations shall not have unions, tub- 
ing fittings, right and left couplings, bushings, compression 
couplings and swing joints made by combinations of fittings. 

Exceptions: 

1 . Tubing joined by brazing. 

2. Fittings listed for use in concealed locations. 

404.4 Piping through foundation wall. Underground piping, 
where installed below grade through the outer foundation or 
basement wall of a building, shall be encased in a protective 
pipe sleeve. The annular space between the gas piping and the 
sleeve shall be sealed. 

404.5 Protection against physical damage. In concealed 
locations, where piping other than black or galvanized steel is 
installed through holes or notches in wood studs, joists, rafters 
or similar members less than 1 .5 inches (38 mm) from the near- I 
est edge of the member, the pipe shall be protected by shield 
plates. Shield plates shall be a minimum of '/jg-inch-thick (1.6 
mm) steel, shall cover the area of the pipe where the member is 
notched or bored and shall extend a minimum of 4 inches (102 
mm) above sole plates, below top plates and to each side of a 
stud, joist or rafter. 

404.6 Piping in solid floors. Piping in solid floors shall be laid 
in channels in the floor and covered in a manner that will allow 
access to the piping with a minimum amount of damage to the 
building. Where such piping is subject to exposure to excessive 
moisture or corrosive substances, the piping shall be protected 
in an approved manner. As an alternative to installation in chan- 
nels, the piping shall be installed in a conduit of Schedule 40 I 
steel, wrought iron, PVC or ABS pipe with tightly sealed ends 
and joints. Both ends of such conduit shall extend not less than | 
2 inches (51 mm) beyond the point where the pipe emerges 
from the floor. The conduit shall be vented above grade to the I 
outdoors and shall be installed so as to prevent the entry of I 
water and insects. I 



66 



2006 INTERNATIONAL FUEL GAS CODE® 



GAS PIPING INSTALLATIONS 



404.7 Above-ground outdoor piping. All piping installed 
outdoors shall be elevated not less than 3V2 inches (152 mm) 
above ground and where installed across roof surfaces, shall be 
elevated not less than 3 V2 inches (152 mm) above the roof sur- 
face. Piping installed above ground, outdoors, and installed 
across the surface of roofs shall be securely supported and lo- 
cated where it will be protected from physical damage. Where 
passing through an outside wall, the piping shall also be pro- 
tected against corrosion by coating or wrapping with an inert 
material. Where piping is encased in a protective pipe sleeve, 
the annular space between the piping and the sleeve shall be 
sealed. 

404.8 Protection against corrosion. Metallic pipe or tubing 
exposed to corrosive action, such as soil condition or moisture, 
shall be protected in an approved manner. Zinc coatings (galva- 
nizing) shall not be deemed adequate protection for gas piping 
underground. Ferrous metal exposed in exterior locations shall 
be protected from corrosion in a manner satisfactory to the 
code official. Where dissimilar metals are joined underground, 
an insulating coupling or fitting shall be used. Piping shall not 
be laid in contact with cinders. 

404.8.1 Prohibited use. Uncoated threaded or socket 
welded joints shall not be used in piping in contact with soil 
or where internal or external crevice corrosion is known to 
occur. 

404.8.2 Protective coatings and wrapping. Pipe protec- 
tive coatings and wrappings shall be approved for the appli- 
cation and shall be factory applied. 

Exception: Where installed in accordance with the man- 
ufacturer's installation instructions, field application of 
coatings and wrappings shall be permitted for pipe nip- 
ples, fittings and locations where the factory coating or 
wrapping has been damaged or necessarily removed at 
joints. 

404.9 Minimum burial depth. Underground piping systems 
shall be installed a minimum depth of 12 inches (305 mm) be- 
low grade, except as provided for in Section 404.9.1. 

404.9.1 Individual outside appliances. Individual lines to 
outside lights, grills or other appliances shall be installed a 
minimum of 8 inches (203 mm) below finished grade, pro- 
vided that such installation is approved and is installed in lo- 
cations not susceptible to physical damage. 

404.10 Trenches. The trench shall be graded so that the pipe 
has a firm, substantially continuous bearing on the bottom of 
the trench. 

404.11 Piping underground beneath buildings. Piping in- 
stalled underground beneath buildings is prohibited except 
where the piping is encased in a conduit of wrought iron, plastic 
pipe, or steel pipe designed to withstand the superimposed 
loads. Such conduit shall extend into an occupiable portion of 
the building and, at the point where the conduit terminates in 
the building, the space between the conduit and the gas piping 
shall be sealed to prevent the possible entrance of any gas leak- 
age. Where the end sealing is capable of withstanding the full 
pressure of the gas pipe, the conduit shall be designed for the 
same pressure as the pipe. Such conduit shall extend not less 
than 4 inches (102 mm) outside the building, shall be vented 



above grade to the outdoors, and shall be installed so as to 
prevent the entrance of water and insects. The conduit shall be 
protected from corrosion in accordance with Section 404.8. 

404.12 Outlet closures. Gas outlets that do not connect to ap- 
pliances shall be capped gas tight. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.13 Location of outlets. The unthreaded portion of piping 
outlets shall extend not less than 1 inch (25 mm) through fin- 
ished ceilings and walls and where extending through floors or 
outdoor patios and slabs, shall not be less than 2 inches (5 1 
mm) above them. The outlet fitting or piping shall be securely 
supported. Outlets shall not be placed behind doors. Outlets 
shall be located in the room or space where the appliance is in- 
stalled. 

Exception: Listed and labeled flush-mounted-type quick- 
disconnect devices and listed and labeled gas convenience 
outlets shall be installed in accordance with the manufac- 
turer's installation instructions. 

404.14 Plastic pipe. The installation of plastic pipe shall com- 
ply with Sections 404.14.1 through 404.14.3. 

404.14.1 Limitations. Plastic pipe shall be installed outside 
underground only. Plastic pipe shall not be used within or 
under any building or slab or be operated at pressures 
greater than 100 psig (689 kPa) for natural gas or 30 psig 
(207 kPa) for LP-gas. 

Exceptions: 

1. Plastic pipe shall be permitted to terminate above 
ground outside of buildings where installed in 
premanufactured anodeless risers or service head 
adapter risers that are installed in accordance with 
the manufacturer's installation instructions. 

2. Plastic pipe shall be permitted to terminate with a 
wall head adapter within buildings where the plas- 
tic pipe is inserted in a piping material for fuel gas 
use in buildings. 

404.14.2 Connections. Connections made outside and un- 
derground between metallic and plastic piping shall be 
made only with transition fittings categorized as Category I 
in accordance with ASTM D 2513. 

404.14.3 Tracer. A yellow insulated copper tracer wire or 
other approved conductor shall be installed adjacent to un- 
derground nonmetallic piping. Access shall be provided to 
the tracer wire or the tracer wire shall terminate above 
ground at each end of the nonmetallic piping. The tracer 
wire size shall not be less than 18 AWG and the insulation 
type shall be suitable for direct burial. 

404.15 Prohibited devices. A device shall not be placed inside 
the piping or fittings that will reduce the cross-sectional area or 
otherwise obstruct the free flow of gas. 

Exception: Approved gas filters. 

404.16 Testing of piping. Before any system of piping is put in 
service or concealed, it shall be tested to ensure that it is gas 



2006 INTERNATIONAL FUEL GAS CODE*^ 



67 



GAS PIPING INSTALLATIONS 



tight. Testing, inspection and purging of piping systems shall 
comply with Section 406. 



SECTION 405 (IFGS) 
PIPING BENDS AND CHANGES IN DIRECTION 

405.1 General. Changes in direction of pipe shall be permitted 
to be made by the use of fittings, factory bends, or field bends. 

405.2 Metallic pipe. Metallic pipe bends shall comply with the 
following: 

I 1 . Bends shall be made only with bending tools and proce- 
dures intended for that purpose. 

2. All bends shall be smooth and free from buckling, cracks 
or other evidence of mechanical damage. 

3. The longitudinal weld of the pipe shall be near the neu- 
tral axis of the bend. 

4. Pipe shall not be bent through an arc of more than 90 
degrees (1.6 rad). 

5 . The inside radius of a bend shall be not less than six times 
the outside diameter of the pipe. 

405.3 Plastic pipe. Plastic pipe bends shall comply with the 
following: 

1 . The pipe shall not be damaged and the internal diameter 
of the pipe shall not be effectively reduced. 

2. Joints shall not be located in pipe bends. 

3. The radius of the inner curve of such bends shall not be 
less than 25 times the inside diameter of the pipe. 

4. Where the piping manufacturer specifies the use of spe- 
I cial bending tools or procedures, such tools or proce- 
. dures shall be used. 

405.4 Elbows. Factory-made welding elbows or transverse 
segments cut therefrom shall have an arc length measured 
along the crotch at least 1 inch (25 mm) in pipe sizes 2 inches 
(51 mm) and larger. 



SECTION 406 (IFGS) 
INSPECTION, TESTING AND PURGING 

406.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to de- 
termine that the materials, design, fabrication, and installation 
practices comply with the requirements of this code. 

406.1.1 Inspections. Inspection shall consist of visual ex- 
amination, during or after manufacture, fabrication, assem- 
bly, or pressure tests as appropriate. Supplementary types of 
nondestructive inspection techniques, such as mag- 
netic-particle, radiographic, ultrasonic, etc., shall not be re- 
quired unless specifically listed herein or in the engineering 
design. 

406.1.2 Repairs and additions. In the event repairs or addi- 
tions are made after the pressure test, the affected piping 
shall be tested. 

Minor repairs and additions are not required to be pres- 
sure tested provided that the work is inspected and connec- 



tions are tested with a noncorrosive leak-detecting fluid or 
other approved leak-detecting methods. 

406.1.3 New branches. Where new branches are installed I 
to new appliances, only the newly installed branches shall I 
be required to be pressure tested. Connections between the 
new piping and the existing piping shall be tested with a 
noncorrosive leak-detecting fluid or other approved 
leak-detecting methods. 

406.1.4 Section testing. A piping system shall be permitted 
to be tested as a complete unit or in sections. Under no cir- 
cumstances shall a valve in a Une be used as a bulkhead 
between gas in one section of the piping system and test 
medium in an adjacent section, unless two valves are installed 
in series with a valved "telltale" located between these valves. 
A valve shall not be subjected to the test pressure unless it can 
be determined that the valve, including the valve-closing 
mechanism, is designed to safely withstand the test pressure. 

406.1.5 Regulators and valve assemblies. Regulator and 
valve assemblies fabricated independently of the piping sys- 
tem in which they are to be installed shall be permitted to be 
tested with inert gas or air at the time of fabrication. 

406.2 Test medium. The test medium shall be air, nitrogen, 
carbon dioxide or an inert gas. Oxygen shall not be used. 

406.3 Test preparation. Pipe joints, including welds, shall be 
left exposed for examination during the test. 

Exception: Covered or concealed pipe end joints that have 
been previously tested in accordance with this code. 

406.3.1 Expansion joints. Expansion joints shall be pro- 
vided with temporary restraints, if required, for the addi- 
tional thrust load under test. 

406.3.2 Appliance and equipment isolation. Appliances 
and equipment that are not to be included in the test shall be 
either disconnected from the piping or isolated by blanks, 
blind flanges, or caps. Flanged joints at which blinds are in- 
serted to blank off other equipment during the test shall not 
be required to be tested. 

406.3.3 Appliance and equipment disconnection. Where 
the piping system is connected to apphances or equipment 
designed for operating pressures of less than the test pressure, I 
such apphances or equipment shall be isolated from the pip- I 
ing system by disconnecting them and capping the outlet(s). 

406.3.4 Valve isolation. Where the piping system is con- 
nected to appliances or equipment designed for operating I 
pressures equal to or greater than the test pressure, such I 
appliances or equipment shall be isolated from the piping 
system by closing the individual appliance or equipment 
shutoff valve(s). 

406.3.5 Testing precautions. All testing of piping systems 
shall be done with due regard for the safety of employees 
and the public during the test. Bulkheads, anchorage, and 
bracing suitably designed to resist test pressures shall be in- 
stalled if necessary. Prior to testing, the interior of the pipe 
shall be cleared of all foreign material. 

406.4 Test pressure measurement. Test pressure shall be 
measured with a manometer or with a pressure-measuring 



68 



2006 INTERNATIONAL FUEL GAS CODE'' 



GAS PIPING INSTALLATIONS 



device designed and calibrated to read, record, or indicate a 
pressure loss caused by leakage during the pressure test period. 
The source of pressure shall be isolated before the pressure 
tests are made. Mechanical gauges used to measure test pres- 
sures shall have a range such that the highest end of the scale is 
not greater than five times the test pressure. 

406.4.1 Test pressure. The test pressure to be used shall be 
no less than IV2 times the proposed maximum working 
pressure, but not less than 3 psig (20 kPa gauge), irrespec- 
tive of design pressure. Where the test pressure exceeds 1 25 
psig (862 kPa gauge), the test pressure shall not exceed a 
value that produces a hoop stress in the piping greater than 
50 percent of the specified minimum yield strength of the 
pipe. 

406.4.2 Test duration. Test duration shall be not less than 
V2 hour for each 500 cubic feet (14 m^) of pipe volume or 
fraction thereof. When testing a system having a volume 
less than 10 cubic feet (0.28 m^) or a system in a single-fam- 
ily dwelling, the test duration shall be not less than 10 min- 
utes. The duration of the test shall not be required to exceed 
24 hours. 

406.5 Detection of leaks and defects. The piping system shall 
withstand the test pressure specified without showing any evi- 
dence of leakage or other defects. 

Any reduction of test pressures as indicated by pressure 
gauges shall be deemed to indicate the presence of a leak unless 
such reduction can be readily attributed to some other cause. 

406.5.1 Detection methods. The leakage shall be located 
by means of an approved gas detector, a noncorrosive leak 
detection fluid, or other approved leak detection methods. 
Matches, candles, open flames, or other methods that could 
provide a source of ignition shall not be used. 

406.5.2 Corrections. Where leakage or other defects are lo- 
cated, the affected portion of the piping system shall be re- 
paired or replaced and retested. 

406.6 Piping system, appliance and equipment leakage 
I check. Leakage checking of systems and equipment shall be in 

accordance with Sections 406.6. 1 through 406.6.4. 

406.6.1 Test gases. Leak checks using fuel gas shall be per- 
mitted in piping systems that have been pressure tested in 
accordance with Section 406. 

406.6.2 Before turning gas on. Before gas is introduced 
into a system of new gas piping, the entire system shall be 
inspected to determine that there are no open fittings or ends 
and that all valves at unused outlets are closed and plugged 
or capped. 

406.6.3 Leak check. Immediately after the gas is turned on 
into a new system or into a system that has been initially 
restored after an interruption of service, the piping system 

I shall be checked for leakage. Where leakage is indicated, 
the gas supply shall be shut off until the necessary repairs 
have been made. 

406.6.4 Placing appliances and equipment in operation. 

(Appliances and equipment shall be permitted to be placed in 
operation after the piping system has been checked for leak- 



age and determined to be free of leakage and purged in 
accordance with Section 406.7.2. 

406.7 Purging. Purging of piping shall comply with Sections 
406.7.1 through 406.7.4. 

406.7.1 Removal from service. Where gas piping is to be 
opened for servicing, addition, or modification, the section 
to be worked on shall be turned off from the gas supply at the 
nearest convenient point, and the line pressure vented to the 
outdoors, or to ventilated areas of sufficient size to prevent 
accumulation of flammable mixtures. 

The remaining gas in this section of pipe shall be dis- 
placed with an inert gas as required by Table 406.7.1. 

TABLE 406.7.1 
LENGTH OF PIPING REQUIRING PURGING WITH 
INERT GAS FOR SERVICING OR MODIFICATION 



NOMINAL PIPE SIZE 
(Inches) 


LENGTH OF PIPING 
REQUIRING PURGING 


2V2 


> 50 feet 


3 


> 30 feet 


4 


> 15 feet 


6 


> 10 feet 


8 or larger 


Any length 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

406.7.2 Placing in operation. Where piping full of air is 
placed in operation, the air in the piping shall be displaced 
with fuel gas, except where such piping is required by Table 
406.7.2 to be purged with an inert gas prior to introduction 
of fuel gas. The air can be safely displaced with fuel gas pro- 
vided that a moderately rapid and continuous flow of fuel 
gas is introduced at one end of the line and air is vented out 
at the other end. The fuel gas flow shall be continued with- 
out interruption until the vented gas is free of air. The point 
of discharge shall not be left unattended during purging. Af- 
ter purging, the vent shall then be closed. Where required by 
Table 406.7.2, the air in the piping shall first be displaced 
with an inert gas, and the inert gas shall then be displaced 
with fuel gas. 

TABLE 406.7.2 

LENGTH OF PIPING REQUIRING PURGING WITH 

INERT GAS BEFORE PLACING IN OPERATION 



NOMINAL PIPE SIZE 
(inches) 


LENGTH OF PIPING 
REQUIRING PURGING 


3 


> 30 feet 


4 


> 15 feet 


6 


> 10 feet 


8 or larger 


Any length 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

406.7.3 Discharge of purged gases. The open end of piping 
systems being purged shall not discharge into confined 
spaces or areas where there are sources of ignition unless 
precautions are taken to perform this operation in a safe 
manner by ventilation of the space, control of purging rate, 
and elimination of all hazardous conditions. 



2006 INTERNATIONAL FUEL GAS CODE® 



69 



GAS PIPING INSTALLATIONS 



406.7.4 Placing appliances and equipment in operation. 

After the piping system has been placed in operation, all 
appliances and equipment shall be purged and then placed 
in operation, as necessary. 



trap shall be either a tee fitting with a capped nipple in the bot- 
tom opening of the run of the tee or other device approved as an 
effective sediment trap. Illuminating appliances, ranges, 
clothes dryers and outdoor grills need not be so equipped. 



SECTION 407 (IFGC) 
PIPING SUPPORT 

I 407.1 General. Piping shall be provided with support in accor- 
dance with Section 407.2. 

407.2 Design and installation. Piping shall be supported with 
pipe hooks, metal pipe straps, bands, brackets, or hangers suit- 
able for the size of piping, of adequate strength and quality, and 
located at intervals so as to prevent or damp out excessive vi- 
bration. Piping shall be anchored to prevent undue strains on 
connected equipment and shall not be supported by other pip- 
ing. Pipe hangers and supports shall conform to the require- 
ments of MSS SP-58 and shall be spaced in accordance with 
Section 415. Supports, hangers, and anchors shall be installed 
so as not to interfere with the free expansion and contraction of 
the piping between anchors. All parts of the supporting equip- 
ment shall be designed and installed so they will not be disen- 
gaged by movement of the supported piping. 



SECTION 408 (IFGC) 
DRIPS AND SLOPED PIPING 

408.1 Slopes. Piping for other than dry gas conditions shall be 
sloped not less than V4 inch in 15 feet (6.3 mm in 4572 mm) to 
prevent traps. 

408.2 Drips. Where wet gas exists, a drip shall be provided at 
any point in the line of pipe where condensate could collect. A 
drip shall also be provided at the outlet of the meter and shall be 
installed so as to constitute a trap wherein an accumulation of 
condensate will shut off the flow of gas before the condensate 
will run back into the meter. 

408.3 Location of drips. Drips shall be provided with ready 
access to permit cleaning or emptying. A drip shall not be lo- 
cated where the condensate is subject to freezing. 

408.4 Sediment trap. Where a sediment trap is not incorpo- 
rated as part of the gas utilization equipment, a sediment trap 
shall be installed downstream of the equipment shutoff valve as 
close to the inlet of the equipment as practical. The sediment 



SECTION 409 (IFGC) 
SHUTOFF VALVES 

409.1 General. Piping systems shall be provided with shutoff 
valves in accordance with this section. 

409.1.1 Valve approval. Shutoff valves shall be of an 
approved type; shall be constructed of materials compatible 
with the piping; and shall comply with the standard that is 
applicable for the pressure and application, in accordance 
with Table 409.1.1. 

409.1.2 Prohibited locations. Shutoff valves shall be pro- 
hibited in concealed locations and furnace plenums. 

409.1.3 Access to shutoff valves. Shutoff valves shall be lo- 
cated in places so as to provide access for operation and 
shall be installed so as to be protected from damage. 

409.2 Meter valve. Every meter shall be equipped with a shut- 
off valve located on the supply side of the meter. 

409.3 Shutoff valves for multiple-house line systems. Where 
a single meter is used to supply gas to more than one building or 
tenant, a separate shutoff valve shall be provided for each 
building or tenant. 

409.3.1 Multiple tenant buildings. In multiple tenant 
buildings, where a conunon piping system is installed to 
supply other than one- and two-family dwellings, shutoff 
valves shall be provided for each tenant. Each tenant shall 
have access to the shutoff valve serving that tenant's space. 

409.3.2 Individual buildings. In a common system serving 
more than one building, shutoff valves shall be installed out- 
doors at each building. 

409.3.3 Identification of shutoff valves. Each house line 
shutoff valve shall be plainly marked with an identification 
tag attached by the installer so that the piping systems sup- 
plied by such valves are readily identified. 

409.4 MP Regulator valves. A listed shutoff valve shall be in- 
stalled immediately ahead of each MP regulator. 



TABLE 409.1.1 
MANUAL GAS VALVE STANDARDS 



VALVE STANDARDS 


APPLIANCE SHUTOFF 

VALVE APPLICATION UP TO 

V2 psig PRESSURE 


OTHER VALVE APPLICATIONS 


UP TO V2 psig 
PRESSURE 


UP TO 2 psig 
PRESSURE 


UP TO 5 psig 
PRESSURE 


UP TO 125 psig 
PRESSURE 


ANSIZ21.15 


X 


— 


— 


— 


— 


CSA Requirement 3-88 


X 


X 


X^ 


X*' 





ASMEB 16.44 


X 


X 


X^ 


x" 


— 


ASMEB16.33 


X 


X 


X 


X 


X 



For SI: 1 pound per square inch gauge = 6.895 kPa. 

a. If labeled 2G. 

b. If labeled 5G. 



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409.5 Equipment shutoff valve. Each appliance shall be pro- 
vided with a shutoff valve separate from the appliance. The 
shutoff valve shall be located in the same room as the appli- 
ance, not further than 6 feet ( 1 829 mm) from the appHance, and 
shall be installed upstream from the union, connector or quick 
disconnect device it serves. Such shutoff valves shall be pro- 
vided with access. 

Exception: Shutoff valves for vented decorative appliances 
and decorative appUances for installation in vented fire- 
places shall not be prohibited from being installed in an area 
remote from the appliance where such valves are provided 
with ready access. Such valves shall be permanently identi- 
fied and shall serve no other equipment. Piping from the 
shutoff valve to within 3 feet (914 mm) of the appliance con- 
nection shall be sized in accordance with Section 402. 

409.5.1 Shutoff valve in fireplace. Equipment shutoff 
valves located in the firebox of a fireplace shall be installed 
in accordance with the appliance manufacturer's instruc- 
tions. 



SECTION 410 (IFGC) 
FLOW CONTROLS 

410.1 Pressure regulators. A line pressure regulator shall be 
installed where the appliance is designed to operate at a lower 

(pressure than the supply pressure. Line gas pressure regulators 
shall be hsted as complying with ANSI Z21 .80. Access shall be 
provided to pressure regulators. Pressure regulators shall be 
protected from physical damage. Regulators installed on the 
exterior of the building shall be approved for outdoor installa- 
tion. 

410.2 MP regulators. MP pressure regulators shall comply 
with the following: 

1 . The MP regulator shall be approved and shall be suitable 
for the inlet and outlet gas pressures for the application. 

2. The MP regulator shall maintain a reduced outlet pres- 
sure under lockup (no-flow) conditions. 

3. The capacity of the MP regulator, determined by pub- 
lished ratings of its manufacturer, shall be adequate to 
supply the appliances served. 

4. The MP pressure regulator shall be provided with access. 
Where located indoors, the regulator shall be vented to 
the outdoors or shall be equipped with a leak-limiting de- 
vice, in either case complying with Section 410.3. 

5 . A tee fitting with one opening capped or plugged shall be 
installed between the MP regulator and its upstream 
shutoff valve. Such tee fitting shall be positioned to al- 
low connection of a pressure-measuring instrument and 
to serve as a sediment trap. 

6. A tee fitting with one opening capped or plugged shall be 
installed not less than 10 pipe diameters downstream of 
the MP regulator outlet. Such tee fitting shall be posi- 
tioned to allow connection of a pressure-measuring in- 
strument. 

410.3 Venting of regulators. Pressure regulators that require a 
I vent shall be vented directly to the outdoors. The vent shall be 



designed to prevent the entry of insects, water and foreign I 
objects. I 

Exception: A vent to the outdoors is not required for regula- 
tors equipped with and labeled for utilization with an 
approved vent-limiting device installed in accordance with 
the manufacturer's instructions. 

410.3.1 Vent piping. Vent piping shall be not smaller than 
the vent connection on the pressure regulating device. Vent 
piping serving relief vents and combination relief and 
breather vents shall be run independently to the outdoors 
and shall serve only a single device vent. Vent piping serv- 
ing only breather vents is permitted to be connected in a 
manifold arrangement where sized in accordance with an 
approved design that minimizes back pressure in the event 
of diaphragm rupture. 



SECTION 411 (IFGC) 

APPLIANCE AND MANUFACTURED 

HOME CONNECTIONS 

411.1 Connecting appliances. Except as required by Section I 
411.1.1, appliances shall be connected to the piping system by | 
one of the following: 

1. Rigid metallic pipe and fittings. 

2. Corrugated stainless steel tubing (CSST) where installed I 
in accordance with the manufacturer's instructions. | 

3. Semirigid metallic tubing and metallic fittings. Lengths 
shall not exceed 6 feet (1829 mm) and shall be located 
entirely in the same room as the appliance. Semirigid 
metallic tubing shall not enter a motor-operated appli- 
ance through an unprotected knockout opening. 

4. Listed and labeled appliance connectors in compliance I 
with ANSI Z21.24 and installed in accordance with the | 
manufacturer's installation instructions and located 
entirely in the same room as the appliance. 

5 . Listed and labeled quick-disconnect devices used in con- 
junction with listed and labeled appliance connectors. 

6. Listed and labeled convenience outlets used in conjunc- 
tion with listed and labeled appliance connectors. 

7. Listed and labeled appliance connectors complying with 
ANSI Z21.69 and listed for use with food service equip- 
ment having casters, or that is otherwise subject to move- 
ment for cleaning, and other large movable equipment. 

8. Listed and labeled outdoor appliance connectors in com- 
pliance with ANSI Z21.75/CSA 6.27 and installed in 
accordance with the manufacturer' s installation instruc- 
tions. 

411.1.1 Commercial cooking appliances. Commercial 
cooking appliances that are moved for cleaning and sanita- 
tion purposes shall be connected to the piping system with 
an appliance connector listed as complying with ANSI 
Z21.69. 

411.1.2 Protection against damage. Connectors and tub- 
ing shall be installed so as to be protected against physical 
damage. 



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411.1.3 Connector installation. Appliance fuel connectors 
shall be installed in accordance with the manufacturer's 
instructions and Sections 411.1.3.1 through 411.1.3.4. 

411.1.3.1 Maximum length. Connectors shall have an 
overall length not to exceed 3 feet (914 mm), except for 
range and domestic clothes dryer connectors, which 
shall not exceed 6 feet ( 1 829 mm) in overall length. Mea- 
surement shall be made along the centerline of the con- 
nector. Only one connector shall be used for each 
appliance. 

Exception: Rigid metallic piping used to connect an 
appliance to the piping system shall be permitted to 
have a total length greater than 3 feet (914 mm), pro- 
vided that the connecting pipe is sized as part of the 
piping system in accordance with Section 402 and the 
location of the equipment shutoff valve complies with 
Section 409.5. 

411.1.3.2 Minimum size. Connectors shall have the 
capacity for the total demand of the connected appliance. 

411.1.3.3 Prohibited locations and penetrations. Con- 
nectors shall not be concealed within, or extended 
through, walls, floors, partitions, ceilings or appliance 
housings. 

Exception: Fireplace inserts that are factory 
equipped with grommets, sleeves or other means of 
protection in accordance with the listing of the appli- 
ance. 

411.1.3.4 Shutoff valve. A shutoff valve not less than the 
nominal size of the connector shall be installed ahead of 
the connector in accordance with Section 409.5. 

411.1.4 Movable appliances. Where appliances are 
equipped with casters or are otherwise subject to periodic 
movement or relocation for purposes such as routine clean- 
ing and maintenance, such appliances shall be connected to 
the supply system piping by means of an approved flexible 
connector designed and labeled for the application. Such 
flexible connectors shall be installed and protected against 
physical damage in accordance with the manufacturer's 
installation instructions. 

411.2 Manufactured home connections. Manufactured 
homes shall be connected to the distribution piping system by 
one of the following materials: 

1. Metallic pipe in accordance with Section 403.4. 

2. Metallic tubing in accordance with Section 403.5. 

3. Listed and labeled connectors in compliance with ANSI 
Z21.75/CSA 6.27 and installed in accordance with the 
manufacturer's installation instructions. 



SECTION 412 (IFGC) 

LIQUEFIED PETROLEUM GAS MOTOR 

VEHICLE FUEL-DISPENSING FACILITIES 

[F] 412.1 General. Motor fuel-dispensing facilities for LP-gas 
fuel shall be in accordance with this section and the Interna- 
tional Fire Code. The operation of LP-gas motor fuel-dispens- 
ing facilities shall be regulated by the International Fire Code. 



[F] 412.2 Storage and dispensing. Storage vessels and equip- 
ment used for the storage or dispensing of LP-gas shall be 
approved or listed in accordance with Sections 412.3 and 
412.4. 

[F] 412.3 Approved equipment. Containers; pressure-relief 
devices, including pressure-relief valves; and pressure regula- 
tors and piping used for LP-gas shall be approved. 

[F] 412.4 Listed equipment. Hoses, hose connections, vehicle 
fuel connections, dispensers, LP-gas pumps and electrical 
equipment used for LP-gas shall be listed. 

[F] 412.5 Attendants. Motor vehicle fueling operations shall 
be conducted by qualified attendants or in accordance with 
Section 412.8 by persons trained in the proper handling of 
LP-gas. 

[F] 412.6 Location. In addition to the fuel dispensing require- 
ments of the International Fire Code, the point of transfer for 
dispensing operations shall be 25 feet (7620 mm) or more from 
buildings having combustible exterior wall surfaces, buildings 
having noncombustible exterior wall surfaces that are not part 
of a 1-hour fire-resistance-rated assembly or buildings having 
combustible overhangs, property which could be built on pub- 
lic streets, or sidewalks and railroads; and at least 10 feet (3048 
nam) from driveways and buildings having noncombustible 
exterior wall surfaces that are part of a fire-resistance-rated 
assembly having a rating of 1 hour or more. 

Exception: The point of transfer for dispensing operations 
need not be separated from canopies providing weather pro- 
tection for the dispensing equipment constructed in accor- 
dance with the International Building Code. 

Liquefied petroleum gas containers shall be located in accor- 
dance with the International Fire Code. Liquefied petroleum 
gas storage and dispensing equipment shall be located out- 
doors and in accordance with the International Fire Code. 

[F] 412.7 Installation of dispensing devices and equipment. 

The installation and operation of LP-gas dispensing systems 
shall be in accordance with this section and the International 
Fire Code. Liquefied petroleum gas dispensers and dispensing 
stations shall be installed in accordance with manufacturers' 
specifications and their listing. 

[F] 412.7.1 Valves. A manual shutoff valve and an excess 
flow-control check valve shall be located in the liquid line 
between the pump and the dispenser inlet where the dis- 
pensing device is installed at a remote location and is not 
part of a complete storage and dispensing unit mounted on a 
common base. 

An excess flow-control check valve or an emergency 
shutoff valve shall be installed in or on the dispenser at the 
point at which the dispenser hose is connected to the liquid 
piping. A differential backpressure valve shall be consid- 
ered equivalent protection. A listed shutoff valve shall be lo- 
cated at the discharge end of the transfer hose. 

[F] 412.7.2 Hoses. Hoses and piping for the dispensing of 
LP-gas shall be provided with hydrostatic relief valves. The 
hose length shall not exceed 18 feet (5486 mm). An 
approved method shall be provided to protect the hose 
against mechanical damage. 



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[F] 412.7.3 Vehicle impact protection. Vehicle impact pro- 
tection for LP-gas storage containers, pumps and dispensers 
shall be provided in accordance with the International Fire 
Code. 

[F] 412.8 Private fueling of motor vehicles. Self-service 
LP-gas dispensing systems, including key, code and card lock 
dispensing systems, shall not be open to the public and shall be 
limited to the filling of permanently mounted fuel containers 
on LP-gas powered vehicles. In addition to the requirements in 
the International Fire Code, self-service LP-gas dispensing 
systems shall be provided with an emergency shutoff switch 
located within 100 feet (30 480 mm) of, but not less than 20 feet 
(6096 mm) from, dispensers and the owner of the dispensing 
facility shall ensure the safe operation of the system and the 
training of users. 



SECTION 413 (IFGC) 

COMPRESSED NATURAL GAS MOTOR 

VEHICLE FUEL-DISPENSING FACILITIES 

[F] 413.1 General. Motor fuel-dispensing facilities for CNG 
fuel shall be in accordance with this section and the Interna- 
tional Fire Code. The operation of CNG motor fuel-dispensing 
facilities shall be regulated by the International Fire Code. 

[F] 413.2 General. Storage vessels and equipment used for the 
storage, compression or dispensing of CNG shall be approved 
or Usted in accordance with Sections 413.2.1 and 413.2.3. 

[F] 413.2.1 Approved equipment. Containers; compres- 
sors; pressure-relief devices, including pressure-relief 
valves; and pressure regulators and piping used for CNG 
shall be approved. 

[F] 413.2.2 Listed equipment. Hoses, hose connections, 
dispensers, gas detection systems and electrical equipment 
used for CNG shall be listed. Vehicle fueling connections 
shall be listed and labeled. 

[F] 413.2.3 General. Residential fueling appliances shall 
be listed. The capacity of a residential fueling appliance 
shall not exceed 5 standard cubic feet per minute (0. 14 stan- 
dard cubic meter/min) of natural gas. 

[F] 413.3 Location of dispensing operations and equip- 
ment. Compression, storage and dispensing equipment shall 
be located above ground outside. 

Exceptions: 

1. Compression, storage or dispensing equipment is 
allowed in buildings of noncombustible construction, 
as set forth in the International Building Code, which 
are unenclosed for three-quarters or more of the per- 
imeter. 

2. Compression, storage and dispensing equipment is 
allowed to be located indoors or in vaults in accor- 
dance with the International Fire Code. 

3 . Residential fueling appliances and equipment shall be 
allowed to be installed indoors in accordance with the 
equipment manufacturer's instructions and Section 
413.4.3. 



[F] 413.3.1 Location on property. In addition to the 
fuel-dispensing requirements of the International Fire 
Code, compression, storage and dispensing equipment not 
located in vaults complying with the International Fire 
Code and other than residential fueling appliances shall not 
be installed: 

1. Beneath power lines. 

2. Less than 10 feet (3048 mm) from the nearest build- 
ing or property line that could be built on, public 
street, sidewalk or source of ignition. 

Exception; Dispensing equipment need not be 
separated from canopies that provide weather pro- 
tection for the dispensing equipment and are con- 
structed in accordance with the International 
Building Code. 

3. Less than 25 feet (7620 mm) from the nearest rail of 
any railroad track. 

4. Less than 50 feet (15 240 mm) from the nearest rail of 
any railroad main track or any railroad or transit line 
where power for train propulsion is provided by an 
outside electrical source, such as third rail or over- 
head catenary. 

5 . Less than 50 feet (15 240 mm) from the vertical plane 
below the nearest overhead wire of a trolley bus line. 

[F] 413.4 Residential fueling appliance installation. Resi- 
dential fueling appliances shall be installed in accordance with 
Sections 413.4.1 through 413.4.3. 

[F] 413.4.1 Gas connections. Residential fueling appli- 
ances shall be connected to the premises, gas piping system 
without causing damage to the piping system or the connec- 
tion to the internal appliance apparatus. 

[F] 413.4.2 Outdoor installation. Residential fueling 
appliances located outdoors shall be installed on a firm, 
noncombustible base. 

[F] 413.4.3 Indoor installation. Where located indoors, 
residential fueling appliances shall be vented to the out- 
doors. A gas detector set to operate at one-fifth of the lower 
limit of flammability of natural gas shall be installed in the 
room or space containing the appliance. The detector shall 
be located within 6 inches (152 mm) of the highest point in 
the room or space. The detector shall stop the operation of 
the appliance and activate an audible or a visual alarm. 

[F] 413.5 Private fueling of motor vehicles. Self-service 
CNG-dispensing systems, including key, code and card lock 
dispensing systems, shall be limited to the filling of perma- 
nently mounted fuel containers on CNG-powered vehicles. 

In addition to the requirements in the International Fire 
Code, the owner of a self-service CNG-dispensing facility 
shall ensure the safe operation of the system and the training of 
users. 

[F] 413.6 Pressure regulators. Pressure regulators shall be 
designed, installed or protected so their operation will not be 
affected by the elements (freezing rain, sleet, snow, ice, mud or 
debris). This protection is allowed to be integral with the regu- 
lator. 



2006 INTERNATIONAL FUEL GAS CODE^ 



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[F] 413.7 Valves. Piping to equipment shall be provided with a 
remote manual shutoff valve. Such valve shall be provided with 
ready access. 

[F] 413.8 Emergency shutdown control. An emergency shut- 
down device shall be located within 75 feet (22 860 mm) of, but 
not less than 25 feet (7620 mm) from, dispensers and shall also 
be provided in the compressor area. Upon activation, the emer- 
gency shutdown system shall automatically shut off the power 
supply to the compressor and close valves between the main 
gas supply and the compressor and between the storage con- 
tainers and dispensers. 

[F] 413.9 Discharge of CNG from motor vehicle fuel stor- 
age containers. The discharge of CNG from motor vehicle 
fuel cylinders for the purposes of maintenance, cylinder certifi- 
cation, calibration of dispensers or other activities shall be in 
accordance with this section. The discharge of CNG from 
motor vehicle fuel cylinders shall be accomplished through a 
closed transfer system or an approved method of atmospheric 
venting in accordance with Section 413.9.1 or 413.9.2. 

[F] 413.9.1 Closed transfer system. A documented proce- 
dure which explains the logical sequence for discharging 
the cylinder shall be provided to the code official for review 
and approval. The procedure shall include what actions the 
operator will take in the event of a low-pressure or 
high-pressure natural gas release during the discharging 
activity. A drawing illustrating the arrangement of piping, 
regulators and equipment settings shall be provided to the 
code official for review and approval. The drawing shall 
illustrate the piping and regulator arrangement and shall be 
shown in spatial relation to the location of the compressor, 
storage vessels and emergency shutdown devices. 

[F] 413.9.2 Atmospheric venting. Atmospheric venting of 
motor vehicle fuel cylinders shall be in accordance with 
Sections 413.9.2.1 through 413.9.2.6. 

[F] 413.9.2.1 Plans and specifications. A drawing illus- 
trating the location of the vessel support, piping, the 
method of grounding and bonding, and other require- 
ments specified herein shall be provided to the code offi- 
cial for review and approval. 

[F] 413.9,2.2 Cylinder stability. A method of rigidly 
supporting the vessel during the venting of CNG shall be 
provided. The selected method shall provide not less 
than two points of support and shall prevent the horizon- 
tal and lateral movement of the vessel. The system shall 
be designed to prevent the movement of the vessel based 
on the highest gas-release velocity through valve orifices 
at the vessel's rated pressure and volume. The structure 
or appurtenance shall be constructed of noncombustible 
materials. 

[F] 413.9.2.3 Separation. The structure or appurtenance 
used for stabilizing the cylinder shall be separated from 
the site equipment, features and exposures and shall be 
located in accordance with Table 413.9.2.3. 

[F] 413.9.2.4 Grounding and bonding. The structure or 
appurtenance used for supporting the cylinder shall be 
grounded in accordance with the ICC Electrical Code. 



The cylinder valve shall be bonded prior to the com- 
mencement of venting operations. 

[F] 413.9.2.5 Vent tube. A vent tube that will divert the 
gas flow to the atmosphere shall be installed on the cylin- 
der prior to the conmiencement of the venting and purg- 
ing operation. The vent tube shall be constructed of pipe 
or tubing materials approved for use with CNG in accor- 
dance with the International Fire Code. 

The vent tube shall be capable of dispersing the gas a 
minimum of 10 feet (3048 nrni) above grade level. The 
vent tube shall not be provided with a rain cap or other 
feature which would limit or obstruct the gas flow. 

At the connection fitting of the vent tube and the CNG 
cylinder, a listed bidirectional detonation flame arrester 
shall be provided. 

[F] 413.9.2.6 Signage. Approved NO SMOKING signs 
shall be posted within 10 feet (3048 mm) of the cylinder 
support structure or appurtenance. Approved CYLIN- 
DER SHALL BE BONDED signs shall be posted on the 
cylinder support structure or appurtenance. 



[F] TABLE 413.9.2.3 

SEPARATION DISTANCE FOR 

ATMOSPHERIC VENTING OF CNG 



EQUIPMENT OR FEATURE 


MINIMUM 
SEPARATION (feet) 


Buildings 


25 


Building openings 


25 


Lot lines 


15 


Public ways 


15 


Vehicles 


25 


CNG compressor and storage vessels 


25 


CNG dispensers 


25 



For SI: 1 foot = 304.8 mm 



SECTION 414 (IFGC) 
SUPPLEMENTAL AND STANDBY GAS SUPPLY 

414.1 Use of air or oxygen under pressure. Where air or oxy- 
gen under pressure is used in connection with the gas supply, 
effective means such as a backpressure regulator and relief 
valve shall be provided to prevent air or oxygen from passing 
back into the gas piping. Where oxygen is used, installation 
shall be in accordance with NFPA 5 1 . 

414.2 Interconnections for standby fuels. Where supplemen- 
tary gas for standby use is connected downstream from a meter 
or a service regulator where a meter is not provided, a device to 
prevent backflow shall be installed. A three-way valve installed 
to admit the standby supply and at the same time shut off the 
regular supply shall be permitted to be used for this purpose. 



74 



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SECTION 415 (IFGS) 
PIPING SUPPORT INTERVALS 

415.1 Interval of support. Piping shall be supported at inter- 
vals not exceeding the spacing specified in Table 415.1. 
Spacing of supports for CSST shall be in accordance with the 
CSST manufacturer's instructions. 

TABLE 415.1 
SUPPORT OF PIPING 



STEEL PIPE, 

NOMINAL SIZE 

OF PIPE 

(inches) 


SPACING OF 

SUPPORTS 

(feet) 


NOMINAL SIZE 

OF TUBING 

(SMOOTH-WALL) 

(inch O.D.) 


SPACING OF 

SUPPORTS 

(feet) 


V, 


6 


% 


4 


3/4 or 1 


8 


'UOT% 


6 


IV4 or larger 
(horizontal) 


10 


%orl 
(Horizontal) 


8 


IV4 or larger 
(vertical) 


Every floor 
level 


1 or Larger 
(vertical) 


Every floor 
level 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 



SECTION 416 (IFGS) 
OVERPRESSURE PROTECTION DEVICES 

416.1 General. Overpressure protection devices shall be pro- 
vided in accordance with this section to prevent the pressure in 
the piping system from exceeding the pressure that would 
cause unsafe operation of any connected and properly adjusted 
appliances. 

416.2 Protection methods.The requirements of this section 
shall be considered to be met and a piping system deemed to 
have overpressure protection where a service or line pressure 
regulator plus one other device are installed such that the fol- 
lowing occur: 

1. Each device limits the pressure to a value that does not 
exceed the maximum working pressure of the down- 
stream system. 

2. The individual failure of either device does not result in 
the overpressurization of the downstream system. 

416.3 Device maintenance. The pressure regulating, limiting 
and relieving devices shall be properly maintained; and inspec- 
tion procedures shall be devised or suitable instrumentation 
installed to detect failures or malfunctions of such devices; and 
replacements or repairs shall be promptly made. 

416.4 Where required. A pressure-relieving or pressure-lim- 
iting device shall not be required where: (1) the gas does not 
contain materials that could seriously interfere with the opera- 
tion of the service or line pressure regulator; (2) the operating 
pressure of the gas source is 60 psi (414 kPa) or less; and (3) the 
service or line pressure regulator has all of the following design 
features or characteristics: 

1. Pipe connections to the service or line regulator do not 
exceed 2 inches (51 mm) nominal diameter. 

2. The regulator is self-contained with no external static or 
control piping. 



3. The regulator has a single port valve with an orifice 
diameter not greater than that recommended by the man- 
ufacturer for the maximum gas pressure at the regulator 
inlet. 

4. The valve seat is made of resilient material designed to 
withstand abrasion of the gas, impurities in the gas and 
cutting by the valve, and to resist permanent deformation 
where it is pressed against the valve port. 

5. The regulator is capable, under normal operating condi- 
tions, of regulating the downstream pressure within the 
necessary limits of accuracy and of limiting the dis- 
charge pressure under no-flow conditions to not more 
than 150 percent of the discharge pressure maintained 
under flow conditions. 

416.5 Devices. Pressure-relieving or pressure-limiting devices 
shall be one of the following: 

1 . Spring-loaded relief device. 

2. Pilot-loaded back pressure regulator used as a rehef 
valve and designed so that failure of the pilot system or 
external control piping will cause the regulator relief 
valve to open. 

3. A monitoring regulator installed in series with the ser- 
vice or line pressure regulator. 

4. A series regulator installed upstream from the service or 
line regulator and set to continuously hmit the pressure 
on the inlet of the service or line regulator to, the maxi- 
mum working pressure of the downstream piping sys- 
tem. 

5. An automatic shutoff device installed in series with the 
service or line pressure regulator and set to shut off when 
the pressure on the downstream piping system reaches 
the maximum working pressure or some other predeter- 
mined pressure less than the maximum working pres- 
sure. This device shall be designed so that it will remain 
closed until manually reset. 

6. A liquid seal relief device that can be set to open accu- 
rately and consistently at the desired pressure. 

The devices shall be installed either as an integral part of the 
service or line pressure regulator or as separate units. Where 
separate pressure-relieving or pressure-limiting devices are 
installed, they shall comply with Sections 416.5.1 through 
416.5.6. 

416.5.1 Construction and installation. Pressure reUeving 
and pressure-limiting devices shall be constructed of mate- 
rials so that the operation of the devices will not be impaired 
by corrosion of external parts by the atmosphere or of inter- 
nal parts by the gas. Pressure-relieving and pres- 
sure-limiting devices shall be designed and installed so that 
they can be operated to determine whether the valve is free. 
The devices shall also be designed and installed so that they 
can be tested to determine the pressure at which they will 
operate and examined for leakage when in the closed posi- 
tion. 

416.5.2 External control piping. External control piping 
shall be protected from falling objects, excavations and 
other causes of damage and shall be designed and installed 



2006 INTERNATIONAL FUEL GAS CODE® 



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so that damage to any control piping will not render both the 
regulator and the overpressure protective device inopera- 
tive. 

416.5.3 Setting. Each pressure-relieving or pressure-limit- 
ing device shall be set so that the pressure does not exceed a 
safe level beyond the maximum allowable working pressure 
for the connected piping and appliances. 

416.5.4 Unauthorized operation. Precautions shall be 
taken to prevent unauthorized operation of any shutoff valve 
that will make a pressure-relieving valve or pressure-Umit- 
ing device inoperative. The following are acceptable meth- 
ods for complying with this provision: 

1 . The valve shall be locked in the open position. Autho- 
rized personnel shall be instructed in the importance 
of leaving the shutoff valve open and of being present 
while the shutoff valve is closed so that it can be 
locked in the open position before leaving the pre- 
mises. 

2. Duplicate relief valves shall be installed, each having 
adequate capacity to protect the system, and the iso- 
lating valves and three-way valves shall be arranged 
so that only one safety device can be rendered inoper- 
ative at a time. 

416.5.5 Vents. The discharge stacks, vents and outlet parts 
of all pressure-relieving and pressure-limiting devices shall 
be located so that gas is safely discharged to the outdoors. 
Discharge stacks and vents shall be designed to prevent the 
entry of water, insects and other foreign material that could 
cause blockage. The discharge stack or vent line shall be at 
least the same size as the outlet of the pressure-relieving 
device. 

416.5.6 Size of fittings, pipe and openings. The fittings, 
pipe and openings located between the system to be pro- 
tected and the pressure-relieving device shall be sized to 
prevent hammering of the valve and to prevent impairment 
of relief capacity. 



76 



2006 INTERNATIONAL FUEL GAS CODE*" 



CHAPTER 5 

CHIMNEYS AND VENTS 



SECTION 501 (IFGC) 
GENERAL 

501.1 Scope. This chapter shall govern the installation, mainte- 
nance, repair and approval of factory-built chimneys, chimney 
liners, vents and connectors and the utilization of masonry 
chimneys serving gas-fired appliances. The requirements for 
the installation, maintenance, repair and approval of fac- 
tory-built chimneys, chimney liners, vents and connectors 
serving appliances burning fuels other than fuel gas shall be 
regulated by the International Mechanical Code. The construc- 
tion, repair, maintenance and approval of masonry chimneys 
shall be regulated by the International Building Code. 

501.2 General. Every appliance shall discharge the products of 
combustion to the outdoors, except for appliances exempted by 
Section 501.8. 

501.3 Masonry chimneys. Masonry chimneys shall be con- 
structed in accordance with Section 503.5.3 and the Interna- 
tional Building Code. 

501.4 Minimum size of chimney or vent. Chinmeys and vents 
shall be sized in accordance with Section 504. 

501.5 Abandoned inlet openings. Abandoned inlet openings 
in chimneys and vents shall be closed by an approved method. 

501.6 Positive pressure. Where an appliance equipped with a 
mechanical forced draft system creates a positive pressure in 
the venting system, the venting system shall be designed for 
positive pressure applications. 

501.7 Connection to fireplace. Connection of appliances to 
chimney flues serving fireplaces shall be in accordance with 
Sections 501.7.1 through 501.7.3. 

501.7.1 Closure and access. A noncombustible seal shall 
be provided below the point of connection to prevent entry 
of room air into the flue. Means shall be provided for access 
to the flue for inspection and cleaning. 

501.7.2 Connection to factory-built fireplace flue. An 

appliance shall not be connected to a flue serving a fac- 
tory-built fireplace unless the appliance is specifically listed 
for such installation. The connection shall be made in accor- 
dance with the appliance manufacturer's installation 
instructions. 

501.7.3 Connection to masonry fireplace flue. A connec- 
tor shall extend from the appliance to the flue serving a 
masonry fireplace such that the flue gases are exhausted 
directly into the flue. The connector shall be accessible or 
removable for inspection and cleaning of both the connector 
and the flue. Listed direct connection devices shall be 
installed in accordance with their listing. 

501.8 Equipment not required to be vented. The following 
apphances shall not be required to be vented. 

1. Ranges. 



2. Built-in domestic cooking units listed and marked for 
optional venting. 

3. Hot plates and laundry stoves. 

4. Type 1 clothes dryers (Type 1 clothes dryers shall be 
exhausted in accordance with the requirements of Sec- 
tion 614). 

5. A single booster-type automatic instantaneous water 
heater, where designed and used solely for the sanitiz- 
ing rinse requirements of a dishwashing machine, pro- 
vided that the heater is installed in a commercial 
kitchen having a mechanical exhaust system. Where 
installed in this manner, the draft hood, if required, 
shall be in place and unaltered and the draft hood outlet 
shall be not less than 36 inches (914 mm) vertically and 
6 inches (152 mm) horizontally from any surface other 
than the heater. 

6. Refrigerators. 

7. Counter appliances. 

8. Room heaters listed for un vented use. 

9. Direct-fired make-up air heaters. 

10. Other equipment listed for unvented use and not pro- 
vided with flue collars. 

1 1 . Specialized equipment of limited input such as labora- 
tory burners and gas lights. 

Where the appliances and equipment listed in Items 5 
through 1 1 above are installed so that the aggregate input rating 
exceeds 20 British thermal units (Btu) per hour per cubic feet 
(207 watts per m^) of volume of the room or space in which 
such appliances and equipment are installed, one or more shall 
be provided with venting systems or other approved means for 
conveying the vent gases to the outdoor atmosphere so that the 
aggregate input rating of the remaining unvented appliances 
and equipment does not exceed the 20 Btu per hour per cubic 
foot (207 watts per m^) figure. Where the room or space in 
which the equipment is installed is directly connected to 
another room or space by a doorway, archway, or other opening 
of comparable size that cannot be closed, the volume of such 
adjacent room or space shall be permitted to be included in the 
calculations. 

501.9 Chimney entrance. Connectors shall connect to a 
masonry chimney flue at a point not less than 12 inches (305 
mm) above the lowest portion of the interior of the chimney 
flue. 

501.10 Connections to exhauster. Appliance connections to a 
chinmey or vent equipped with a power exhauster shall be 
made on the inlet side of the exhauster. Joints on the positive 
pressure side of the exhauster shall be sealed to prevent 
flue-gas leakage as specified by the manufacturer's installation 
instructions for the exhauster. 



2006 INTERNATIONAL FUEL GAS CODE'' 



77 



CHIMNEYS AND VENTS 



501.11 Masonry chimneys. Masonry chimneys utilized to 
vent appliances shall be located, constructed and sized as spec- 
ified in the manufacturer's installation instructions for the 
appliances being vented and Section 503. 

501.12 Residential and low-heat appliances flue lining sys- 
tems. Flue lining systems for use with residential-type and 
low-heat appliances shall be limited to the following: 

1. Clay flue lining complying with the requirements of 
ASTM C 315 or equivalent. Clay flue lining shall be 
installed in accordance with the International Building 
Code. 

2 . Listed chimney lining systems complying with UL 1777. 

3. Other approved materials that will resist, without crack- 
ing, softening or corrosion, flue gases and condensate at 
temperatures up to 1,800°F (982°C). 

501.13 Category I appliance flue lining systems. Flue lining 
systems for use with Category I appliances shall be limited to 
the following: 

1. Flue lining systems complying with Section 501.12. 

2. Chimney lining systems listed and labeled for use with 
gas appliances with draft hoods and other Category I gas 
appliances listed and labeled for use with Type B vents. 

501.14 Category II, III and IV appliance venting systems. 

The design, sizing and installation of vents for Category II, III 
and IV appliances shall be in accordance with the appliance 
manufacturer's installation instructions. 

501.15 Existing chimneys and vents. Where an appliance is 
permanently disconnected from an existing chimney or vent, or 
where an appliance is connected to an existing chimney or vent 
during the process of a new installation, the chimney or vent 
shall comply with Sections 501.15.1 through 501.15.4. 

501.15.1 Size. The chimney or vent shall be resized as nec- 
essary to control flue gas condensation in the interior of the 
chinmey or vent and to provide the appliance or appliances 
served with the required draft. For Category I appliances, 
the resizing shall be in accordance with Section 502. 

501.15.2 Flue passageways. The flue gas passageway shall 
be free of obstructions and combustible deposits and shall 
be cleaned if previously used for venting a solid or liquid 
fuel-burning appliance or fireplace. The flue liner, chimney 
inner wall or vent inner wall shall be continuous and shall be 
free of cracks, gaps, perforations or other damage or deteri- 
oration which would allow the escape of combustion prod- 
ucts, including gases, moisture and creosote. 

501.15.3 Cleanout. Masonry chimney flues shall be pro- 
vided with a cleanout opening having a minimum height of 
6 inches (152 mm). The upper edge of the opening shall be 
located not less than 6 inches (152 mm) below the lowest 
chimney inlet opening. The cleanout shall be provided with 
a tight-fitting, noncombustible cover. 

501.15.4 Clearances. Chimneys and vents shall have air- 
space clearance to combustibles in accordance with the 
International Building Code and the chimney or vent manu- 
facturer's installation instructions. Noncombustible 



firestopping or fireblocking shall be provided in accordance 
with the International Building Code. 

Exception: Masonry chimneys equipped with a chim- 
ney lining system tested and listed for installation in 
chimneys in contact with combustibles in accordance 
with UL 1777, and installed in accordance with the man- 
ufacturer's instructions, shall not be required to have 
clearance between combustible materials and exterior 
surfaces of the masonry chimney. 



SECTION 502 (IFGC) 
VENTS 

502.1 General. All vents, except as provided in Section 503.7, 
shall be listed and labeled. Type B and B W vents shall be tested 
in accordance with UL 441. Type L vents shall be tested in 
accordance with UL 641. Vents for Category II and III appli- 
ances shall be tested in accordance with UL 1738. Plastic vents 
for Category IV appliances shall not be required to be listed and 
labeled where such vents are as specified by the appliance man- 
ufacturer and are installed in accordance with the appliance 
manufacturer's installation instructions. 

502.2 Connectors required. Connectors shall be used to con- 
nect appliances to the vertical chimney or vent, except where 
the chimney or vent is attached directly to the appliance. Vent 
connector size, material, construction and installation shall be 
in accordance with Section 503. 

502.3 Vent application. The application of vents shall be in 
accordance with Table 503.4. 

502.4 Insulation shield. Where vents pass through insulated 
assemblies, an insulation shield constructed of not less than 26 
gage sheet (0.016 inch) (0.4 mm) metal shall be installed to pro- 
vide clearance between the vent and the insulation material. 
The clearance shall not be less than the clearance to combusti- 
bles specified by the vent manufacturer's installation instruc- 
tions. Where vents pass through attic space, the shield shall 
terminate not less than 2 inches (51 mm) above the insulation 
materials and shall be secured in place to prevent displacement. 
Insulation shields provided as part of a listed vent system shall 
be installed in accordance with the manufacturer's installation 
instructions. 

502.5 Installation. Vent systems shall be sized, installed and 
terminated in accordance with the vent and appliance manufac- 
turer's installation instructions and Section 503. 

502.6 Support of vents. All portions of vents shall be ade- 
quately supported for the design and weight of the materials 
employed. 

502.7 Protection against physical damage. In concealed 
locations, where a vent is installed through holes or notches in 
studs, joists, rafters or similar members less than 1 .5 inches (38 
mm) from the nearest edge of the member, the vent shall be pro- 
tected by shield plates. Shield plates shall be a minimum of 
Vig-inch-thick (1.6 mm) steel, shall cover the area of the vent 
where the member is notched or bored and shall extend a mini- 
mum of 4 inches (102 mm) above sole plates, below top plates 
and to each side of a stud, joist or rafter. 



78 



2006 INTERNATIONAL FUEL GAS CODE® 



CHIMNEYS AND VENTS 



SECTION 503 (IFGS) 
VENTING OF APPLIANCES 

503.1 General. This section recognizes that the choice of vent- 
ing materials and the methods of installation of venting sys- 
tems are dependent on the operating characteristics of the 

(appliance being vented. The operating characteristics of vented 
appliances can be categorized with respect to: (1) positive or 
negative pressure within the venting system; and (2) whether or 
not the appliance generates flue or vent gases that might con- 
dense in the venting system. See Section 202 for the definitions 
of these vented appliance categories. 

503.2 Venting systems required. Except as permitted in Sec- 
I tions 503.2.1 through 503.2.4 and 501.8, all appHances shall be 

connected to venting systems. 

503.2.1 Ventilating hoods. Ventilating hoods and exhaust 
I systems shall be permitted to be used to vent appliances 

installed in commercial applications (see Section 503.3.4) 
I and to vent industrial appliances, such as where the process 
itself requires fume disposal. 

503.2.2 Well-ventilated spaces. Where located in a large 
I and well- ventilated space, industrial appliances shall be per- 
mitted to be operated by discharging the flue gases directly 
into the space. 

1503.2.3 Direct-vent appliances. Listed direct-vent appH- 
ances shall be installed in accordance with the manufactur- 
er's instructions and Section 503.8, Item 3. 

I 503.2.4 Appliances with integral vents. Appliances incor- 
porating integral venting means shall be considered prop- 
erly vented where installed in accordance with the 

I manufacturer's instructions and Section 503.8, Items 1 and 

2. 

503.3 Design and construction. A venting system shall be 
designed and constructed so as to develop a positive flow ade- 

I quate to convey flue or vent gases to the outdoors. 

503.3.1 Appliance draft requirements. A venting system 
I shall satisfy the draft requirements of the appliance in accor- 
dance with the manufacturer's instructions. 

I 503.3.2 Design and construction. Appliances required to 
be vented shall be connected to a venting system designed 
and installed in accordance with the provisions of Sections 
503.4 through 503. 15. 

503.3.3 Mechanical draft systems. Mechanical draft sys- 
tems shall comply with the following: 

1 . Mechanical draft systems shall be listed and shall be 
installed in accordance with the manufacturer's 

(installation instructions for both the appliance and the 
mechanical draft system. 

I 2. Appliances, except incinerators, requiring venting 

shall be permitted to be vented by means of mechani- 
cal draft systems of either forced or induced draft 
design. 

3 . Forced draft systems and all portions of induced draft 
systems under positive pressure during operation 



shall be designed and installed so as to prevent leak- 
age of flue or vent gases into a building. 

4. Vent connectors serving appliances vented by natural 
draft shall not be connected into any portion of 
mechanical draft systems operating under positive 
pressure. 

5. Where a mechanical draft system is employed, provi- 
sions shall be made to prevent the flow of gas to the 
main burners when the draft system is not performing 
so as to satisfy the operating requirements of the 
appliance for safe performance. 

6. The exit terminals of mechanical draft systems shall 
be not less than 7 feet (2134 mm) above grade where 
located adjacent to public walkways and shall be 
located as specified in Section 503.8, Items 1 and 2. 

503.3.4 Ventilating hoods and exhaust systems. Ventilat- 
ing hoods and exhaust systems shall be permitted to be used 
to vent appliances installed in commercial applications. 
Where automatically operated appliances are vented 
through a ventilating hood or exhaust system equipped with 
a damper or with a power means of exhaust, provisions shall 
be made to allow the flow of gas to the main burners only 
when the damper is open to a position to properly vent the 
appliance and when the power means of exhaust is in opera- 
tion. 

503.3.5 Circulating air ducts and furnace plenums. No 

portion of a venting system shall extend into or pass through 
any circulating air duct or furnace plenum. 

503.3.6 Above-ceiling air-handUng spaces. Where a vent- 
ing system passes through an above-ceiling air-handling 
space or other nonducted portion of an air-handling system, 
the venting system shall conform to one of the following 
requirements: 

1 . The venting system shall be a listed special gas vent; 
other venting system serving a Category III or Cate- 
gory IV appliance; or other positive pressure vent, 
with joints sealed in accordance with the appliance or 
vent manufacturer's instructions. 

2 . The venting system shall be installed such that fittings 
and joints between sections are not installed in the 
above-ceiling space. 

3. The venting system shall be installed in a conduit or 
enclosure with sealed joints separating the interior of 
the conduit or enclosure from the ceiling space. 

503.4 Type of venting system to be used. The type of venting 
system to be used shall be in accordance with Table 503.4. 

503.4.1 Plastic piping. Plastic piping used for venting 
appliances listed for use with such venting materials shall be | 
approved. 

503.4.2 Special gas vent. Special gas vent shall be listed 
and installed in accordance with the special gas vent manu- | 
facturer's installation instructions. 



2006 INTERNATIONAL FUEL GAS CODE'' 



79 



CHIMNEYS AND VENTS 



TABLE 503.4 
TYPE OF VENTING SYSTEM TO BE USED 



APPLIANCES 


TYPE OF VENTING SYSTEM 


Listed Category I appliances 

Listed appliances equipped with draft hood 

Appliances listed for use with Type B gas vent 


Type B gas vent (Section 503.6) 

Chimney (Section 503.5) 

Single- wall metal pipe (Section 503.7) 

Listed chimney lining system for gas venting (Section 503.5.3) 

Special gas vent Usted for these appliances (Section 503.4.2) 


Listed vented wall furnaces 


Type B-W gas vent (Sections 503.6, 608) 


Category 11 appliances 


As specified or furnished by manufacturers of Usted appliances 
(Sections 503.4.1, 503.4.2) 


Category III appliances 


As specified or furnished by manufacturers of listed appUances 
(Sections 503.4.1, 503.4.2) 


Category IV appliances 


As specified or furnished by manufacturers of listed appliances 
(Sections 503.4.1, 503.4.2) 


Incinerators, indoors 


Chimney (Section 503.5) 


Incinerators, outdoors 


Single-wall metal pipe (Sections 503.7, 503.7.6) 


Appliances that can be converted for use with solid fuel 


Chimney (Section 503.5) 


Unlisted combination gas and oil-burning appliances 


Chimney (Section 503.5) 


Listed combination gas and oil-burning appliances 


Type L vent (Section 503.6) or chimney (Section 503.5) 


Combination gas and solid fuel-burning appliances 


Chinmey (Section 503.5) 


Appliances listed for use with chimneys only 


Chimney (Section 503.5) 


Unlisted appliances 


Chimney (Section 503.5) 


Decorative appliances in vented fireplaces 


Chimney 


Gas-fired toilets 


Single-wall metal pipe (Section 626) 


Direct-vent appliances 


See Section 503.2.3 


Appliances with integral vent 


See Section 503.2.4 



503.5 Masonry, metal, and factory-built chimneys. 

Masonry, metal and factory-built chimneys shall comply with 
Sections 503.5.1 through 503.5.10. 

503.5.1 Factory-built chimneys. Factory-built chimneys 
shall be installed in accordance with the manufacturer's 
installation instructions. Factory-built chimneys used to 
vent appliances that operate at a positive vent pressure shall 
be listed for such application. 

503.5.2 Metal chimneys. Metal chimneys shall be built and 
installed in accordance with NFPA 211. 

503.5.3 Masonry chimneys. Masonry chimneys shall be 
built and installed in accordance with NFPA 211 and shall 
be lined with approved clay flue lining, a listed chimney lin- 
ing system or other approved material that will resist corro- 
sion, erosion, softening or cracking from vent gases at 
temperatures up to 1,800°F (982°C). 

Exception: Masonry chimney flues serving listed gas 
appliances with draft hoods. Category I appliances and 
other gas appliances listed for use with Type B vents 
shall be permitted to be lined with a chimney lining sys- 
tem specifically listed for use only with such appliances. 
The liner shall be installed in accordance with the liner 



manufacturer's installation instructions. A permanent 
identifying label shall be attached at the point where the 
connection is to be made to the liner. The label shall read: 
"This chimney liner is for appliances that bum gas only. 
Do not connect to solid or liquid fuel-burning appliances 
or incinerators." 

For installation of gas vents in existing masonry chim- 
neys, see Section 503.6.3. 

503.5.4 Chimney termination. Chimneys for residen- 
tial-type or low-heat appliances shall extend at least 3 feet 
(914 mm) above the highest point where they pass through a 
roof of a building and at least 2 feet (610 mm) higher than 
any portion of a building within a horizontal distance of 10 
feet (3048 nun) (see Figure .503.5.4). Chimneys for 
medium-heat appliances shall extend at least 10 feet (3048 
mm) higher than any portion of any building within 25 feet 
(7620 mm). Chimneys shall extend at least 5 feet (1524 mm) 
above the highest connected appliance draft hood outlet or 
flue collar. Decorative shrouds shall not be installed at the 
termination of factory-built chiirmeys except where such 
shrouds are listed and labeled for use with the specific fac- 
tory-built chimney system and are installed in accordance 
with the manufacturer's installation instructions. 



80 



2006 INTERNATIONAL FUEL GAS CODE'' 



CHIMNEYS AND VENTS 



10 FT 
OR LESS 



WALL OR 
PARAPET 



1^ -^J- 

CHIMNEY 



3FT 
MIN 



CHIMNEY 





2 FT 


.10 FT 






OR LESS 






MIN: 




1 1 
1 1 
1 1 
1 1 
1 1 




RIDGE . 


^ 


V 


3 FT 
MIN. 


Y 


N 


1 1 
1 1 
1 1 
1 1 

LJ 


.^ 



A. TERMINATION 10 FT OR LESS FROM RIDGE, WALL, OR PARAPET 



WALL OR 
PARAPET 



NOTE: NO HEIGHT 

ABOVE PARAPET 

REQUIRED WHEN 

DISTANCE FROM WALLS 

OR PARAPET IS MORE CHIMNEY 

THAN 10 FT 



J^uL 



3 FT 
MIN 




HEIGHT ABOVE 
ANY ROOF 
SURFACE WITHIN 
10 R HORIZONTALLY 



3 FT 
MIN. 



JkfJL 

CHIMNEY 



B. TERMINATION MORE THAN 10 FT FROM RIDGE, WALL, OR PARAPET 

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE 503.5.4 

TYPICAL TERMINATION LOCATIONS FOR 

CHIMNEYS AND SINGLE-WALL METAL PIPES SERVING 

RESIDENTIAL-TYPE AND LOW-HEAT EQUIPMENT 



503.5.5 Size of chimneys. The effective area of a chimney 
venting system serving Hsted appliances with draft hoods, 
Category I appHances, and other apphances Hsted for use 
with Type B vents shall be determined in accordance with 
one of the following methods: 

1 . The provisions of Section 504. 

2. For sizing an individual chimney venting system for a 
single appliance with a draft hood, the effective areas 
of the vent connector and chimney flue shall be not 
less than the area of the appliance flue collar or draft 
hood outlet, nor greater than seven times the draft 
hood outlet area. 

3. For sizing a chimney venting system connected to 
two appliances with draft hoods, the effective area of 
the chimney flue shall be not less than the area of the 
larger draft hood outlet plus 50 percent of the area of 
the smaller draft hood outlet, nor greater than seven 
times the smallest draft hood outlet area. 

4. Chimney venting systems using mechanical draft 
shall be sized in accordance with approved engineer- 
ing methods. 

5. Other approved engineering methods. 

503.5.5.1 Incinerator venting. Where an incinerator is 
vented by a chimney serving other appliances, the gas | 
input to the incinerator shall not be included in calculat- 
ing chimney size, provided that the chimney flue diame- 
ter is not less than 1 inch (25 mm) larger in equivalent 
diameter than the diameter of the incinerator flue outlet. 

503.5.6 Inspection of chimneys. Before replacing an exist- 
ing appliance or connecting a vent connector to a chimney, 
the chimney passageway shall be examined to ascertain that 
it is clear and free of obstructions and it shall be cleaned if 
previously used for venting solid or liquid fuel-burning 
appliances or fireplaces. 

503.5.6.1 Chimney lining. Chimneys shall be lined in 
accordance with NFPA 211. 

Exception: Existing chimneys shall be permitted to 
have their use continued when an appliance is 
replaced by an appliance of similar type, input rating, 
and efficiency. 

503.5.6.2 Cleanouts. Cleanouts shall be examined to 
determine if they will remain tightly closed when not in 
use. 

503.5.6.3 Unsafe chimneys. Where inspection reveals 
that an existing chimney is not safe for the intended 
appUcation, it shall be repaired, rebuilt, lined, relined or 
replaced with a vent or chimney to conform to NFPA 211 
and it shall be suitable for the appliances to be vented. | 

503.5.7 Chimneys serving equipment burning other 
fuels. Chimneys serving equipment burning other fuels 
shall comply with Sections 503.5.7.1 through 503.5.7.4. 

503.5.7.1 Solid fuel-burning appliances. An appliance | 
shall not be connected to a chimney flue serving a sepa- 
rate appliance designed to bum sohd fuel. 



2006 INTERNATIONAL FUEL GAS CODE® 



81 



CHIMNEYS AND VENTS 



503.5.7.2 Liquid fuel-burning appliances. Where one 

I chimney flue serves gas appliances and liquid fuel-burn- 

ing appliances, the appliances shall be connected 
through separate openings or shall be connected through 
a single opening where joined by a suitable fitting 
located as close as practical to the chimney. Where two or 
more openings are provided into one chimney flue, they 
shall be at different levels. Where the appliances are 
automatically controlled, they shall be equipped with 
safety shutoff devices. 

503.5.7.3 Combination gas and solid fuel-burning 
appliances. A combination gas- and solid fuel-burning 
appliance shall be permitted to be connected to a single 
chimney flue where equipped with a manual reset device 
to shut off gas to the main burner in the event of sustained 
backdraft or flue gas spillage. The chimney flue shall be 
sized to properly vent the appliance. 

503.5.7.4 Combination gas- and oil fuel-burning 
appliances. A listed combination gas- and oil fuel-burn- 
ing appliance shall be permitted to be connected to a sin- 
gle chimney flue. The chimney flue shall be sized to 
properly vent the appliance. 

503.5.8 Support of chimneys. All portions of chimneys 
shall be supported for the design and weight of the materials 
employed. Factory-built chimneys shall be supported and 

I spaced in accordance with the manufacturer's installation 
instructions. 

503.5.9 Cleanouts. Where a chimney that formerly carried 
flue products from liquid or solid fuel-burning appliances is 
used with an appliance using fuel gas, an accessible 
cleanout shall be provided. The cleanout shall have a 
tight-fitting cover and shall be installed so its upper edge is 
at least 6 inches (152 mm) below the lower edge of the low- 
est chimney inlet opening. 

503.5.10 Space surrounding lining or vent. The remain- 
ing space surrounding a chimney liner, gas vent, special gas 
vent or plastic piping installed within a masonry chimney 
flue shall not be used to vent another appliance. The inser- 
tion of another liner or vent within the chimney as provided 
in this code and the liner or vent manufacturer's instructions 
shall not be prohibited. 

The remaining space surrounding a chimney liner, gas 
vent, special gas vent or plastic piping installed within a 
masonry, metal or factory-built chimney shall not be used to 
supply combustion air. Such space shall not be prohibited 
from supplying combustion air to direct-vent appliances 
designed for installation in a solid fuel-burning fireplace 

I and installed in accordance with the manufacturer's instal- 
lation instructions. 

503.6 Gas vents. Gas vents shall comply with Sections 503.6. 1 
through 503.6.12 (see Section 202, Definitions). 

503.6.1 Installation, general. Gas vents shall be installed 
in accordance with the manufacturer's installation instruc- 
tions. 

503.6.2 Type B-W vent capacity. A Type B-W gas vent 
shall have a listed capacity not less than that of the listed 
vented wall furnace to which it is connected. 



503.6.3 Gas vents installed within masonry chimneys. Gas 

vents installed within masonry chimneys shall be installed in 
accordance with the manufacturer's installation instructions. | 
Gas vents installed within masonry chimneys shall be identi- 
fied with a permanent label installed at the point where the 
vent enters the chimney. The label shall contain the following 
language: "This gas vent is for apphances that bum gas. Do 
not connect to sohd or liquid fuel-burning apphances or 
incinerators." ^ 

503.6.4 Gas vent terminations. A gas vent shall terminate 
in accordance with one of the following: 

1. Gas vents that are 12 inches (305 mm) or less in size 
and located not less than 8 feet (2438 mm) from a ver- 
tical wall or similar obstruction shall terminate above 
the roof in accordance with Figure 503.6.4. 

2. Gas vents that are over 12 inches (305 mm) in size or 
are located less than 8 feet (2438 mm) from a vertical 
wall or similar obstruction shall terminate not less 
than 2 feet (610 mm) above the highest point where 
they pass through the roof and not less than 2 feet (610 
mm) above any portion of a building within 10 feet 
(3048 mm) horizontally. 

3. As provided for industrial appliances in Section 
503.2.2. 

4. As provided for direct-vent systems in Section 
503.2.3. 

5. As provided for appliances with integral vents in Sec- 
tion 503.2.4. 

6. As provided for mechanical draft systems in Section 
503.3.3. 

7. As provided for ventilating hoods and exhaust sys- 
tems in Section 503.3.4. 

503.6.4.1 Decorative shrouds. Decorative shrouds shall 
not be installed at the termination of gas vents except 
where such shrouds are listed for use with the specific 
gas venting system and are installed in accordance with 
manufacturer's installation instructions. 

503.6.5 Minimum height. A Type B or L gas vent shall ter- 
minate at least 5 feet (1524 mm) in vertical height above the 
highest connected appliance draft hood or flue collar. A 
Type B-W gas vent shall terminate at least 12 feet (3658 
nmi) in vertical height above the bottom of the wall furnace. 

503.6.6 Roof terminations. Gas vents shall extend through 
the roof flashing, roof jack or roof thimble and terminate 
with a listed cap or listed roof assembly. 

503.6.7 Forced air inlets. Gas vents shall terminate not less 
than 3 feet (914 mm) above any forced air inlet located 
within 10 feet (3048 mm). 

503.6.8 Exterior wall penetrations. A gas vent extending 
through an exterior wall shall not terminate adjacent to the 
wall or below eaves or parapets, except as provided in Sec- 
tions 503.2.3 and 503.3.3. 

503.6.9 Size of gas vents. Venting systems shall be sized 
and constructed in accordance with Section 504 or other 



82 



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CHIMNEYS AND VENTS 



approved engineering methods and the gas vent and appli- 
ance manufacturer's installation instructions. 

503.6.9.1 Category I appliances. The sizing of natural 
draft venting systems serving one or more listed appli- 
ances equipped with a draft hood or appliances listed for 
use with Type B gas vent, installed in a single story of a 
building, shall be in accordance with one of the following 
methods: 

1. The provisions of Section 504. 

2. For sizing an individual gas vent for a single, 
draft-hood-equipped appliance, the effective area 
of the vent connector and the gas vent shall be not 
less than the area of the appliance draft hood outlet, 
nor greater than seven times the draft hood outlet 
area. 

3. For sizing a gas vent connected to two appliances 
with draft hoods, the effective area of the vent shall 




H (MIN.) ■ 

MINIMUM HEIGHT FROM ROOF 

TO LOWEST DISCHARGE OPENING 



ROOF SLOPE 


H (min) ft 


Flat to 6/12 


1.0 


Over 6/12 to 7/12 


1.25 


Over 7/12 to 8/12 


1.5 


Over 8/12 to 9/12 


2.0 


Over 9/12 to 10/12 


2.5 


Over 10/12 to 11/12 


3.25 


Over 11/12 to 12/12 


4.0 


Over 12/12 to 14/12 


5.0 


Over 14/12 to 16/12 


6.0 


Over 16/12 to 18/12 


7.0 


Over 18/12 to 20/12 


7.5 


Over 20/12 to 21/12 


8.0 



be not less than the area of the larger draft hood 
outlet plus 50 percent of the area of the smaller 
draft hood outlet, nor greater than seven times the 
smaller draft hood outlet area. 

4. Approved engineering practices. 

503.6.9.2 Vent offsets. Type B and L vents sized in 
accordance with Item 2 or 3 of Section 503.6.9.1 shall 
extend in a generally vertical direction with offsets not 
exceeding 45 degrees (0.79 rad), except that a vent sys- 
tem having not more than one 60-degree (1 .04 rad) off- 
set shall be permitted. Any angle greater than 45 degrees 
(0.79 rad) from the vertical is considered horizontal. The 
total horizontal distance of a vent plus the horizontal vent 
connector serving draft hood-equipped appliances shall 
be not greater than 75 percent of the vertical height of the 
vent. 

503.6.9.3 Category II, III and IV appliances. The siz- 
ing of gas vents for Category II, III and IV appliances 
shall be in accordance with the appliance manufacturer's 
instructions. 

503.6.9.4 Mechanical draft. Chimney venting systems 
using mechanical draft shall be sized in accordance with 
approved engineering methods. 

503.6.10 Gas vents serving appliances on more than one 
floor. A common gas vent shall be permitted in multistory 
installations to vent Category I appliances located on more 
than one floor level, provided that the venting system is 
designed and installed in accordance with approved engi- 
neering methods. For the purpose of this section, crawl 
spaces, basements and attics shall be considered as floor 
levels. 

503.6.10.1 Appliance separation. All appliances con- 
nected to the common vent shall be located in rooms sep- 
arated from occupiable space. Each of these rooms shall 
have provisions for an adequate supply of combustion, 
ventilation and dilution air that is not supplied from an 
occupiable space (see Figure 503.6.10.1). 



GAS FURNACE 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

FIGURE 503.6.4 

TERMINATION LOCATIONS FOR GAS VENTS WITH 

LISTED CAPS 12 INCHES OR LESS IN SIZE AT LEAST 8 FEET 

FROM A VERTICAL WALL 




TYPE B GAS VENTS 



AIR GRILLS IN 
OUTSIDE WALL 



LOUVERED DOOR PERMrTTED 
TO BE USED IN LIEU OF 
OUTSIDE WALL GRILLS 



FIGURE 503.6.10.1 

PLAN VIEW OF PRACTICAL SEPARATION METHOD 

FOR MULTISTORY GAS VENTING 



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83 



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503.6.10.2 Sizing. The size of the connectors and com- 
mon segments of multistory venting systems for 
appHances listed for use with Type B double-wall gas 
vents shall be in accordance with Table 504.3(1), pro- 
vided that: 

1. The available total height (H) for each segment of 
a multistory venting system is the vertical distance 
between the level of the highest draft hood outlet 
or flue collar on that floor and the centerline of the 
next highest interconnection tee (see Figure B- 13). 

2. The size of the connector for a segment is deter- 
mined from the appliance input rating and avail- 
able connector rise, and shall not be smaller than 
the draft hood outlet or flue collar size. 

3. The size of the common vertical segment, and of 
the interconnection tee at the base of that segment, 
shall be based on the total appliance input rating 
entering that segment and its available total height. 

503.6.11 Support of gas vents. Gas vents shall be sup- 
ported and spaced in accordance with the manufacturer's 
installation instructions. 

503.6.12 Marking. In those localities where solid and liq- 
uid fuels are used extensively, gas vents shall be perma- 
nently identified by a label attached to the wall or ceiling at a 
point where the vent connector enters the gas vent. The 
determination of where such localities exist shall be made 
by the code official. The label shall read: 

"This gas vent is for appliances that bum gas. Do not con- 
nect to solid or liquid fuel-burning appliances or incinera- 
tors." 

503.7 Single-wall metal pipe. Single-wall metal pipe vents 
shall comply with Sections 503.7.1 through 503.7.12. 

503.7.1 Construction. Single- wall metal pipe shall be con- 
structed of galvanized sheet steel not less than 0.0304 inch 
(0.7 mm) thick, or other approved, noncombustible, corro- 
sion-resistant material. 

503.7.2 Cold climate. Uninsulated single-wall metal pipe 
shall not be used outdoors for venting appliances in regions 
where the 99-percent winter design temperature is below 
32°F (0°C). 

503.7.3 Termination. Single-wall metal pipe shall termi- 
nate at least 5 feet (1524 mm) in vertical height above the 
highest connected appliance draft hood outlet or flue collar. 
Single- wall metal pipe shall extend at least 2 feet (610 mm) 
above the highest point where it passes through a roof of a 
building and at least 2 feet (610 mm) higher than any portion 
of a building within a horizontal distance of 10 feet (3048 
mm) (see Figure 503.5.4). An approved cap or roof assem- 
bly shall be attached to the terminus of a single-wall metal 
pipe (see also Section 503.7.8, Item 3). 

503.7.4 Limitations of use. Single- wall metal pipe shall be 
used only for runs directly from the space in which the 



appliance is located through the roof or exterior wall to the | 
outdoor atmosphere. 

503.7.5 Roof penetrations. A pipe passing through a roof 
shall extend without interruption through the roof flashing, 
roof jack, or roof thimble. Where a single-wall metal pipe 
passes through a roof constructed of combustible material, a 
noncombustible, nonventilating thimble shall be used at the 
point of passage. The thimble shall extend at least 18 inches 
(457 mm) above and 6 inches (152 mm) below the roof with 
the annular space open at the bottom and closed only at the 
top. The thimble shall be sized in accordance with Section 
503.10.15. 

503.7.6 Installation. Single- wall metal pipe shall not origi- 
nate in any unoccupied attic or concealed space and shall not 
pass through any attic, inside wall, concealed space, or floor. 
The installation of a single- wall metal pipe through an exte- 
rior combustible wall shall comply with Section 503.10.15. 
Single-wall metal pipe used for venting an incinerator shall 
be exposed and readily examinable for its full length and 
shall have suitable clearances maintained. 

503.7.7 Clearances. Minimum clearances from single-wall 
metal pipe to combustible material shall be in accordance 
with Table 503.7.7. The clearance from single- wall metal 
pipe to combustible material shall be permitted to be 
reduced where the combustible material is protected as 
specified for vent connectors in Table 308.2. 

503.7.8 Size of single-wall metal pipe. A venting system 
constructed of single- wall metal pipe shall be sized in accor- 
dance with one of the following methods and the appliance I 
manufacturer's instructions: | 

1. For a draft-hood-equipped appliance, in accordance 
with Section 504. 

2. For a venting system for a single appliance with a 
draft hood, the areas of the connector and the pipe 
each shall be not less than the area of the appliance 
flue collar or draft hood outlet, whichever is smaller. 
The vent area shall not be greater than seven times the 
draft hood outlet area. 

3. Other approved engineering methods. 

503.7.9 Pipe geometry. Any shaped single- wall metal pipe 
shall be permitted to be used, provided that its equivalent 
effective area is equal to the effective area of the round pipe 
for which it is substituted, and provided that the minimum 
internal dimension of the pipe is not less than 2 inches (5 1 
mm). 

503.7.10 Termination capacity. The vent cap or a roof 
assembly shall have a venting capacity not less than that of 
the pipe to which it is attached. 

503.7.11 Support of single- wall metal pipe. All portions 
of single-wall metal pipe shall be supported for the design 
and weight of the material employed. 

503.7.12 Marking. Single- wall metal pipe shall comply 
with the marking provisions of Section 503.6.12. 



84 



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CHIMNEYS AND VENTS 



TABLE 503.7.7^ 
CLEARANCES FOR CONNECTORS 



APPLIANCE 


MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL 


Listed Type B gas 
vent material 


Listed Type L 
vent material 


Single-wall 
metal pipe 


Factory-built 
chimney sections 


Listed appliances with draft hoods and appliances listed for 
use with Type B gas vents 


As listed 


As Usted 


6 inches 


As Usted 


Residential boilers and furnaces with Usted gas conversion 
burner and with draft hood 


6 inches 


6 inches 


9 inches 


As Usted 


Residential appliances listed for use with Type L vents 


Not permitted 


As Usted 


9 inches 


As listed 


Listed gas-fired toilets 


Not permitted 


As listed 


As listed 


As listed 


Unlisted residential appliances with draft hood 


Not permitted 


6 inches 


9 inches 


As listed 


Residential and low-heat appliances other than above 


Not permitted 


9 inches 


18 inches 


As listed 


Medium-heat appliances 


Not permitted 


Not permitted 


36 inches 


As listed 



For SI: 1 inch = 25.4 mm. 

a. These clearances shall apply unless the manufacturer's installation instructions for a listed appliance or connector specify different clearances, in which case the 
listed clearances shall apply. 



503.8 Venting system termination location. The location of 
venting system terminations shall comply with the following 
(see Appendix C): 

1. A mechanical draft venting system shall terminate at 
least 3 feet (914 mm) above any forced-air inlet located 
within 10 feet (3048 mm). 

Exceptions: 

1 . This provision shall not apply to the combus- 
tion air intake of a direct- vent appliance. 

2. This provision shall not apply to the separation 
of the integral outdoor air inlet and flue gas dis- 
charge of listed outdoor appliances. 

2. A mechanical draft venting system, excluding 
direct-vent appliances, shall terminate at least 4 feet 
(1219 mm) below, 4 feet (1219 mm) horizontally from, 
or 1 foot (305 nmri) above any door, operable window, or 
gravity air inlet into any building. The bottom of the vent 
terminal shall be located at least 12 inches (305 mm) 
above grade. 

3 . The vent terminal of a direct- vent appliance with an input 
of 10,000 Btu per hour (3 kW) or less shall be located at 
least 6 inches (152 mm) from any air opening into a 
building, and such an appliance with an input over 
10,000 Btu per hour (3 kW) but not over 50,000 Btu per 
hour (14.7 kW) shall be installed with a 9-inch (230 mm) 
vent termination clearance, and an appliance with an 
input over 50,000 Btu/h (14.7 kw) shall have at least a 
12-inch (305 mm) vent termination clearance. The bot- 
tom of the vent terminal and the air intake shall be located 
at least 12 inches (305 mm) above grade. 

4. Through-the-wall vents for Category II and IV appli- 
ances and noncategorized condensing appliances shall 
not terminate over public walkways or over an area 
where condensate or vapor could create a nuisance or 
hazard or could be detrimental to the operation of regula- 
tors, relief valves, or other equipment. Where local expe- 
rience indicates that condensate is a problem with 



Category I and in appliances, this provision shall also 
apply. 

503.9 Condensation drainage. Provisions shall be made to 
collect and dispose of condensate from venting systems serv- 
ing Category II and IV appliances and noncategorized con- 
densing appliances in accordance with Section 503.8, Item 4. 
Where local experience indicates that condensation is a prob- 
lem, provision shall be made to drain off and dispose of con- 
densate from venting systems serving Category I and III 
appliances in accordance with Section 503.8, Item 4. 

503.10 Vent connectors for Category I equipment. Vent con- 
nectors for Category I equipment shall comply with Sections 
503.10.1 through 503. 10. 16. 

503.10.1 Where required. A vent connector shall be used 
to coimect an appliance to a gas vent, chimney or sin- 
gle-wall metal pipe, except where the gas vent, chimney or 
single-wall metal pipe is directly connected to the appli- 
ance. 

503.10.2 Materials. Vent connectors shall be constructed in 
accordance with Sections 503.10.2.1 through 503.10.2.5. 

503.10.2.1 General. A vent connector shall be made of 
noncombustible corrosion-resistant material capable of 
withstanding the vent gas temperature produced by the 
appliance and of sufficient thickness to withstand physi- 
cal damage. 

503.10.2.2 Vent connectors located in unconditioned 
areas. Where the vent connector used for an appliance 
having a draft hood or a Category I appliance is located in 
or passes through attics, crawl spaces or other uncondi- 
tioned spaces, that portion of the vent connector shall be 
listed Type B, Type L or listed vent material having 
equivalent insulation properties. 

Exception: Single- wall metal pipe located within the 
exterior walls of the building in areas having a local 
99-percent winter design temperature of 5°F (-15°C) 
or higher shall be permitted to be used in uncondi- 
tioned spaces other than attics and crawl spaces. 



2006 INTERNATIONAL FUEL GAS CODE® 



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503.10.2.3 Residential-type appliance connectors. 

Where vent connectors for residential-type appliances 
are not installed in attics or other unconditioned spaces, 
connectors for listed appliances having draft hoods, 
appliances having draft hoods and equipped with listed 
conversion burners and Category I appliances shall be 
one of the following: 

1 . Type B or L vent material; 

2. Galvanized sheet steel not less than 0.018 inch 
(0.46 nun) thick; 

3. Aluminum (1100 or 3003 alloy or equivalent) 
sheet not less than 0.027 inch (0.69 mm) thick; 

4. Stainless steel sheet not less than 0.012 inch (0.3 1 
mm) thick; 

5. Smooth interior wall metal pipe having resistance 
to heat and corrosion equal to or greater than that 
of Item 2, 3 or 4 above; or 

6. A listed vent connector. 

Vent connectors shall not be covered with insulation. 

Exception: Listed insulated vent connectors shall be 
installed according to the terms of their listing. 

503.10.2.4 Low-heat equipment. A vent connector for 
a nonresidential, low-heat appliance shall be a fac- 
tory-built chinmey section or steel pipe having resistance 
to heat and corrosion equivalent to that for the appropri- 
ate galvanized pipe as specified in Table 503. 10.2.4. Fac- 
tory-built chimney sections shall be joined together in 
accordance with the chimney manufacturer's instruc- 
tions. 

TABLE 503.10.2.4 

MINIMUM THICKNESS FOR GALVANIZED STEEL VENT 

CONNECTORS FOR LOW-HEAT APPLIANCES 



DIAMETER OF CONNECTOR 
(inches) 


MINIMUM THICKNESS 
(inch) 


Less than 6 


0.019 


6 to less than 10 


0.023 


10 to 12 inclusive 


0.029 


14 to 16 inclusive 


0.034 


Over 16 


0.056 



For SI: 1 inch = 25.4 mm. 

503.10.2.5 Medium-heat appliances. Vent connectors 
for medium-heat appliances and commercial and indus- 
trial incinerators shall be constructed of factory-built 
medium-heat chimney sections or steel of a thickness not 
less than that specified in Table 503.10.2.5 and shall 
comply with the following: 

1 . A steel vent connector for an appliance with a vent 
gas temperature in excess of 1,000°F (538°C) 
measured at the entrance to the connector shall be 
lined with medium-duty fire brick (ASTM C 64, 
Type F), or the equivalent. 

2. The lining shall be at least 2V2 inches (64 mm) 
thick for a vent connector having a diameter or 



greatest cross-sectional dimension of 18 inches 
(457 mm) or less. 

3. The hning shall be at least 4V2 inches (114 mm) 
thick laid on the 4V2-inch (1 14 mm) bed for a vent 
connector having a diameter or greatest cross-sec- 
tional dimension greater than 1 8 inches (457 mm). 

4. Factory-built chimney sections, if employed, shall 
be joined together in accordance with the chimney 
manufacturer ' s instructions . 

TABLE 503.10.2.5 

MINIMUM THICKNESS FOR STEEL VENT CONNECTORS FOR 

MEDIUM-HEAT APPLIANCES AND COMMERCIAL AND 

INDUSTRIAL INCINERATORS VENT CONNECTOR SIZE 



DIAMETER 
(inches) 


AREA 
(square inches) 


MINIMUM THICKNESS 
(inch) 


Up to 14 


Up to 154 


0.053 


Over 14 to 16 


154 to 201 


0.067 


Over 16 to 18 


201 to 254 


0.093 


Over 18 


Larger than 254 


0.123 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm?. 

503.10.3 Size of vent connector. Vent connectors shall be 
sized in accordance with Sections 503.10.3.1 through 
503.10.3.5. 

503.10.3.1 Single draft hood and fan-assisted. A vent 
connector for an appliance with a single draft hood or for 
a Category I fan-assisted combustion system appliance 
shall be sized and installed in accordance with Section 
504 or other approved engineering methods. 

503.10.3.2 Multiple draft hood. For a single appliance 
having more than one draft hood outlet or flue collar, the 
manifold shall be constructed according to the instruc- 
tions of the appliance manufacturer. Where there are no 
instructions, the manifold shall be designed and con- 
structed in accordance with approved engineering prac- 
tices. As an alternate method, the effective area of the 
manifold shall equal the combined area of the flue collars 
or draft hood outlets and the vent connectors shall have a 
minimum 1-foot (305 mm) rise. 

503.10.3.3 Multiple appliances. Where two or more ap- 
pliances are connected to a common vent or chimney, 
each vent connector shall be sized in accordance with 
Section 504 or other approved engineering methods. 

As an alternative method applicable only when all of 
the appliances are draft hood equipped, each vent con- 
nector shall have an effective area not less than the area of 
the draft hood outlet of the appliance to which it is con- 
nected. 

503.10.3.4 Common connector/manifold. Where two 
or more appliances are vented through a common vent 
connector or vent manifold, the common vent connector 
or vent manifold shall be located at the highest level con- 
sistent with available headroom and the required clear- 
ance to combustible materials and shall be sized in 
accordance with Section 504 or other approved engi- 
neering methods. 



86 



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As an alternate method applicable only where there 
are two draft hood-equipped appliances, the effective 
area of the common vent connector or vent manifold and 
all junction fittings shall be not less than the area of the 
larger vent connector plus 50 percent of the area of the 
smaller flue collar outlet. 

503.10.3.5 Size increase. Where the size of a vent con- 
nector is increased to overcome installation limitations 
I and obtain connector capacity equal to the appliance 

input, the size increase shall be made at the appliance 
draft hood outlet. 

503.10.4 Two or more appliances connected to a single 
vent. Where two or more vent connectors enter a common 
gas vent, chimney flue, or single-wall metal pipe, the 
smaller connector shall enter at the highest level consistent 
with the available headroom or clearance to combustible 
material. Vent connectors serving Category I appliances 
shall not be connected to any portion of a mechanical draft 
system operating under positive static pressure, such as 
those serving Category III or IV appliances. 

503.10.5 Clearance. Minimum clearances from vent con- 
nectors to combustible material shall be in accordance with 
Table 503.7.7. 

Exception: The clearance between a vent connector and 
combustible material shall be permitted to be reduced 
where the combustible material is protected as specified 
for vent connectors in Table 308.2. 

503.10.6 Flow resistance. A vent connector shall be in- 
stalled so as to avoid turns or other construction features that 
create excessive resistance to flow of vent gases. 

503.10.7 Joints. Joints between sections of connector pip- 
ing and connections to flue collars and draft hood outlets 
shall be fastened by one of the following methods: 

1. Sheet metal screws. 

2. Vent connectors of listed vent material assembled and 
connected to flue collars or draft hood outlets in ac- 
cordance with the manufacturers' instructions. 

3. Other approved means. 

503.10.8 Slope. A vent connector shall be installed without 
dips or sags and shall slope upward toward the vent or chim- 
ney at least V4 inch per foot (21 mm/m). 

Exception: Vent connectors attached to a mechanical 
draft system installed in accordance with the manufac- 
turers' instructions. 

503.10.9 Length of vent connector. A vent connector shall 
I be as short as practical and the appliance located as close as 

practical to the chimney or vent. The maximum horizontal 
length of a single- wall connector shall be 75 percent of the 

(height of the chimney or vent except for engineered sys- 
tems. The maximum horizontal length of a Type B dou- 
ble-wall connector shall be 100 percent of the height of the 
I chimney or vent except for engineered systems . For a chim- 
ney or vent system serving multiple appliances, the maxi- 
mum length of an individual connector, from the appliance 
outlet to the junction with the common vent or another con- 



nector, shall be 100 percent of the height of the chimney or 
vent. 

503.10.10 Support. A vent connector shall be supported for 
the design and weight of the material employed to maintain 
clearances and prevent physical damage and separation of 
joints. 

503.10.11 Chimney connection. Where entering a flue in a 
masonry or metal chimney, the vent connector shall be in- 
stalled above the extreme bottom to avoid stoppage. Where 
a thimble or slip joint is used to facilitate removal of the con- 
nector, the connector shall be firmly attached to or inserted 
into the thimble or slip joint to prevent the connector from 
falling out. Means shall be employed to prevent the connec- 
tor from entering so far as to restrict the space between its 
end and the opposite wall of the chimney flue (see Section 
501.9). 

503.10.12 Inspection. The entire length of a vent connector 
shall be provided with ready access for inspection, cleaning, 
and replacement. 

503.10.13 Fireplaces. A vent connector shall not be con- 
nected to a chimney flue serving a fireplace unless the fire- 
place flue opening is permanently sealed. 

503.10.14 Passage through ceilings, floors or walls. Sin- 
gle-wall metal pipe connectors shall not pass through any 
wall, floor or ceiling except as permitted by Sections 
503.7.4 and 503.10.15. 

503.10.15 Single-wall connector penetrations of com- 
bustible walls. A vent connector made of a single-wall 
metal pipe shall not pass through a combustible exterior 
wall unless guarded at the point of passage by a ventilated 
metal thimble not smaller than the following: 

1. For listed appliances equipped with draft hoods and 
appliances listed for use with Type B gas vents, the 
thimble shall be not less than 4 inches (102 mm) 
larger in diameter than the vent connector. Where 
there is a run of not less than 6 feet (1829 mm) of vent 
connector in the open between the draft hood outlet 
and the thimble, the thimble shall be permitted to be 
not less than 2 inches (5 1 mm) larger in diameter than 
the vent connector. 

2. For unlisted appliances having draft hoods, the thim- 
ble shall be not less than 6 inches (152 mm) larger in 
diameter than the vent connector. 

3. For residential and low-heat appliances, the thimble 
shall be not less than 1 2 inches (305 mm) larger in di- 
ameter than the vent connector. 

Exception: In lieu of thimble protection, all combustible 
material in the wall shall be removed from the vent con- 
nector a sufficient distance to provide the specified clear- 
ance from such vent connector to combustible material. 
Any material used to close up such opening shall be 
noncombustible. 

503.10.16 Medium-heat connectors. Vent connectors for 
medium-heat appliances shall not pass through walls or par- 
titions constructed of combustible material. 



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503.11 Vent connectors for Category II, III and IV appli- 
ances. Vent connectors for Category II, III and IV appliances 
shall be as specified for the venting systems in accordance with 
Section 503.4. 

503.12 Draft hoods and draft controls. The installation of 
draft hoods and draft controls shall comply with Sections 
503.12.1 through 503.12.7. 

1503.12.1 Appliances requiring draft hoods. Vented appli- 
ances shall be installed with draft hoods. 

Exception: Dual oven-type combination ranges; 

(incinerators; direct-vent appliances; fan-assisted com- 
bustion system appliances; appliances requiring chim- 
ney draft for operation; single firebox boilers equipped 
with conversion burners with inputs greater than 400,000 
I Btu per hour (1 17 kw); appliances equipped with blast, 

power or pressure burners that are not listed for use with 
I draft hoods ; and appliances designed for forced venting. 

503.12.2 Installation. A draft hood supplied with or form- 
I ing a part of a listed vented appliance shall be installed with- 
out alteration, exactly as furnished and specified by the 

I appliance manufacturer. 

503.12.2.1 Draft hood required. If a draft hood is not 
I supplied by the appliance manufacturer where one is 

required, a draft hood shall be installed, shall be of a 
listed or approved type and, in the absence of other 
I instructions, shall be of the same size as the appliance 

flue collar. Where a draft hood is required with a conver- 
sion burner, it shall be of a listed or approved type. 

503.12.2.2 Special design draft hood. Where it is deter- 
mined that a draft hood of special design is needed or 
preferable for a particular installation, the installation 
shall be in accordance with the recommendations of the 

I appliance manufacturer and shall be approved. 

503.12.3 Draft control devices. Where a draft control 
I device is part of the appliance or is supplied by the appliance 

manufacturer, it shall be installed in accordance with the 
manufacturer's instructions. In the absence of manufactur- 
er's instructions, the device shall be attached to the flue col- 
I lar of the appliance or as near to the appliance as practical. 

I 503.12.4 Additional devices. Appliances (except incinera- 
tors) requiring a controlled chimney draft shall be permitted 
to be equipped with a listed double-acting barometric-draft 
regulator installed and adjusted in accordance with the man- 
ufacturer's instructions. 

503.12.5 Location. Draft hoods and barometric draft regu- 
lators shall be installed in the same room or enclosure as the 

I appliance in such a manner as to prevent any difference in 
pressure between the hood or regulator and the combustion 
air supply. 

503.12.6 Positioning. Draft hoods and draft regulators shall 
be installed in the position for which they were designed 
with reference to the horizontal and vertical planes and shall 



be located so that the relief opening is not obstructed by any 
part of the appliance or adj acent construction. The appliance I 
and its draft hood shall be located so that the relief opening I 
is accessible for checking vent operation. 

503.12.7 Clearance. A draft hood shall be located so its 
relief opening is not less than 6 inches (152 mm) from any 
surface except that of the appliance it serves and the venting | 
system to which the draft hood is connected. Where a 
greater or lesser clearance is indicated on the appliance | 
label, the clearance shall be not less than that specified on 
the label. Such clearances shall not be reduced. 

503.13 Manually operated dampers. A manually operated 
damper shall not be placed in the vent connector for any appli- | 
ance. Fixed baffles shall not be classified as manually operated 
dampers. 

503.14 Automatically operated vent dampers. An automati- 
cally operated vent damper shall be of a listed type. 

503.15 Obstructions. Devices that retard the flow of vent 
gases shall not be installed in a vent connector, chimney or 
vent. The following shall not be considered as obstructions: 

1 . Draft regulators and safety controls specifically listed for 
installation in venting systems and installed in accor- 
dance with the manufacturer' s installation instructions. | 

2. Approved draft regulators and safety controls that are 
designed and installed in accordance with approved 
engineering methods. 

3. Listed heat reclaimers and automatically operated vent 
dampers installed in accordance with the manufacturer' s I 
installation instructions. I 

4. Approved economizers, heat reclaimers and recupera- 
tors installed in venting systems of appliances not 
required to be equipped with draft hoods, provided that 
the appliance manufacturer's instructions cover the | 
installation of such a device in the venting system and 
performance in accordance with Sections 503.3 and 
503.3.1 is obtained. 

5. Vent dampers serving listed appliances installed in 
accordance with Sections 504.2.1 and 504.3.1 or other 
approved engineering methods. 



SECTION 504 (IFGS) 

SIZING OF CATEGORY I APPLIANCE 

VENTING SYSTEMS 

504.1 Definitions. The following definitions apply to the 
tables in this section. 

APPLIANCE CATEGORIZED VENT DIAME- 
TER/AREA. The minimum vent area/diameter permissible 
for Category I appliances to maintain a nonpositive vent static 
pressure when tested in accordance with nationally recognized 
standards. 



88 



2006 INTERNATIONAL FUEL GAS CODE® 



CHIMNEYS AND VENTS 



FAN-ASSISTED COMBUSTION SYSTEM. An appliance 
equipped with an integral mechanical means to either draw or 
force products of combustion through the combustion chamber 
or heat exchanger. 

FAN Min. The minimum input rating of a Category I fan-as- 
sisted appliance attached to a vent or connector. 

FAN Max. The maximum input rating of a Category I fan-as- 
sisted appliance attached to a vent or connector. 

NAT Max. The maximum input rating of a Category I 
draft-hood-equipped appliance attached to a vent or connec- 
tor. 

FAN + FAN. The maximum combined appliance input rating 
of two or more Category I fan-assisted appliances attached to 
the common vent. 

FAN + NAT. The maximum combined appliance input rating 
of one or more Category I fan-assisted appliances and one or 
more Category I draft-hood-equipped appliances attached to 
the common vent. 

NA. Vent configuration is not allowed due to potential for con- 
densate formation or pressurization of the venting system, or 
not applicable due to physical or geometric restraints. 

NAT + NAT. The maximum combined appliance input rating 
of two or more Category I draft-hood-equipped appliances at- 
tached to the common vent. 

504.2 Application of single-appliance vent Tables 504.2(1) 
through 504.2(6). The application of Tables 504.2(1) through 
504.2(6) shall be subject to the requirements of Sections 
504.2.1 through 504.2.16. 

504.2.1 Vent obstructions. These venting tables shall not 
be used where obstructions, as described in Section 503.15, 
are installed in the venting system. The installation of vents 
serving listed appliances with vent dampers shall be in 
accordance with the appliance manufacturer's instructions 
or in accordance with the following: 

1 . The maximum capacity of the vent system shall be de- 
termined using the "NAT Max" column. 

2. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance, using the 
"FAN Min" column to determine the minimum ca- 
pacity of the vent system. Where the corresponding 
"FAN Min" is "NA," the vent configuration shall not 
be permitted and an alternative venting configuration 
shall be utilized. 

504.2.2 Minimum size. Where the vent size determined 
from the tables is smaller than the appliance draft hood out- 
let or flue collar, the smaller size shall be permitted to be 
used provided that all of the following requirements are met: 

1 . The total vent height (H) is at least 10 feet (3048 mm). 

2. Vents for appliance draft hood outlets or flue collars 
12 inches (305 mm) in diameter or smaller are not re- 
duced more than one tablesize. 



3. Vents for appliance draft hood outlets or flue collars 
larger than 12 inches (305 mm) in diameter are not re- 
duced more than two table sizes. 

4. The maximum capacity listed in the tables for a 
fan-assisted appliance is reduced by 10 percent (0.90 
X maximum table capacity). 

5. The draft hood outlet is greater than 4 inches (102 
mm) in diameter. Do not connect a 3-inch-diameter 
(76 mm) vent to a 4-inch-diameter (102 mm) draft 
hood outlet. This provision shall not apply to fan-as- 
sisted appliances. 

504.2.3 Vent oi^sets. Single-appliance venting configura- 
tions with zero (0) lateral lengths in Tables 504.2(1), 
504.2(2) and 504.2(5) shall not have elbows in the venting 
system. Single-appliance venting configurations with lat- 
eral lengths include two 90-degree (1.57 rad) elbows. For 
each additional elbow up to and including 45 degrees (0.79 
rad), the maximum capacity listed in the venting tables shall 
be reduced by 5 percent. For each additional elbow greater 
than 45 degrees (0.79 rad) up to and including 90 degrees 
(1.57 rad), the maximum capacity listed in the venting 
tables shall be reduced by 10 percent. 

504.2.4 Zero lateral. Zero (0) lateral (L) shall apply only to 
a straight vertical vent attached to a top outlet draft hood or 
flue collar. 

504.2.5 High-altitude installations. Sea-level input rat- 
ings shall be used when determining maximum capacity for 
high altitude installation. Actual input (derated for altitude) 
shall be used for determining minimum capacity for high al- 
titude installation. 

504.2.6 Multiple input rate appliances. For appliances 
with more than one input rate, the minimum vent capacity 
(FAN Min) determined from the tables shall be less than 
the lowest appliance input rating, and the maximum vent 
capacity (FAN Max/NAT Max) determined from the 
tables shall be greater than the highest appliance rating 
input. 

504.2.7 Liner system sizing and connections. Listed cor- 
rugated metallic chimney liner systems in masonry chim- 
neys shall be sized by using Table 504.2(1) or 504.2(2) for 
Type B vents with the maximum capacity reduced by 20 
percent (0.80 x maximum capacity) and the minimum 
capacity as shown in Table 504.2(1) or 504.2(2). Corru- 
gated metallic liner systems installed with bends or offsets 
shall have their maximum capacity further reduced in 
accordance with Section 504.2.3. The 20-percent reduc- 
tion for corrugated metallic chimney liner systems 
includes an allowance for one long-radius 90-degree (1.57 
rad) turn at the bottom of the liner. 

Connections between chimney liners and hsted dou- 
ble-wall connectors shall be made with listed adapters 
designed for such purpose. 



2006 INTERNATIONAL FUEL GAS CODE® 



89 



TABLE 504.2(1) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 
(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAMETER— <D; inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








78 


46 





152 


86 





251 


141 





375 


205 





524 


285 





698 


370 





897 


470 


2 


13 


51 


36 


18 


97 


67 


27 


157 


105 


32 


232 


157 


44 


321 


217 


53 


425 


285 


63 


543 


370 


4 


21 


49 


34 


30 


94 


64 


39 


153 


103 


50 


227 


153 


66 


316 


211 


79 


419 


279 


93 


536 


362 


6 


25 


46 


32 


36 


91 


61 


47 


149 


100 


59 


223 


149 


78 


310 


205 


93 


413 


273 


110 


530 


354 


8 








84 


50 





165 


94 





276 


155 





415 


235 





583 


320 





780 


415 





1,006 


537 


2 


12 


57 


40 


16 


109 


75 


25 


178 


120 


28 


263 


180 


42 


365 


247 


50 


483 


322 


60 


619 


418 


5 


23 


53 


38 


32 


103 


71 


42 


171 


115 


53 


255 


173 


70 


356 


237 


83 


473 


313 


99 


607 


407 


8 


28 


49 


35 


39 


98 


66 


51 


164 


109 


64 


247 


165 


84 


347 


227 


99 


463 


303 


117 


596 


396 


10 








88 


53 





175 


100 





295 


166 





447 


255 





631 


345 





847 


450 





1,096 


585 


2 


12 


61 


42 


17 


118 


81 


23 


194 


129 


26 


289 


195 


40 


402 


273 


48 


533 


355 


57 


684 


457 


5 


23 


57 


40 


32 


113 


77 


41 


187 


124 


52 


280 


188 


68 


392 


263 


81 


522 


346 


95 


671 


446 


10 


30 


51 


36 


41 


104 


70 


54 


176 


115 


67 


267 


175 


88 


376 


245 


104 


504 


330 


122 


651 


427 


15 








94 


58 





191 


112 





327 


187 





502 


285 





716 


390 





970 


525 





1,263 


682 


2 


11 


69 


48 


15 


136 


93 


20 


226 


150 


22 


339 


225 


38 


475 


316 


45 


633 


414 


53 


815 


544 


5 


22 


65 


45 


30 


130 


87 


39 


219 


142 


49 


330 


217 


64 


463 


300 


76 


620 


403 


90 


800 


529 


10 


29 


59 


41 


40 


121 


82 


51 


206 


135 


64 


315 


208 


84 


445 


288 


99 


600 


386 


116 


777 


507 


15 


35 


53 


37 


48 


112 


76 


61 


195 


128 


76 


301 


198 


98 


429 


275 


115 


580 


373 


134 


755 


491 


20 








97 


61 





202 


119 





349 


202 





540 


307 





776 


430 





1,057 


575 





1,384 


752 


2 


10 


75 


51 


14 


149 


100 


18 


250 


166 


20 


377 


249 


33 


531 


346 


41 


711 


470 


50 


917 


612 


5 


21 


71 


48 


29 


143 


96 


38 


242 


160 


47 


367 


241 


62 


519 


337 


73 


697 


460 


86 


902 


599 


10 


28 


64 


44 


38 


133 


89 


50 


229 


150 


62 


351 


228 


81 


499 


321 


95 


675 


443 


112 


877 


576 


15 


34 


58 


40 


46 


124 


84 


59 


217 


142 


73 


337 


217 


94 


481 


308 


111 


654 


427 


129 


853 


557 


20 


48 


52 


35 


55 


116 


78 


69 


206 


134 


84 


322 


206 


107 


464 


295 


125 


634 


410 


145 


830 


537 



(continued) 



m 

3) 

z 
o 

Z 
> 

r- 

Tl 

c 
m 

i- 

o 

> 

Ui 

o 

O 
O 

ni 



TABLE 504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 

(h; 

(feet) 


LATERAL 

(Q 

(feet) 


VENT DIAMETER— <P^ inches 


3 


4 


5 


6 


7 


8 


9 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








100 


64 





213 


128 





374 


220 





587 


336 





853 


475 





1,173 


650 





1,548 


855 


2 


9 


81 


56 


13 


166 


112 


14 


283 


185 


18 


432 


280 


27 


613 


394 


33 


826 


535 


42 


1,072 


700 


5 


21 


77 


54 


28 


160 


108 


36 


275 


176 


45 


421 


273 


58 


600 


385 


69 


811 


524 


82 


1,055 


688 


10 


27 


70 


50 


37 


150 


102 


48 


262 


171 


59 


405 


261 


77 


580 


371 


91 


788 


507 


107 


1,028 


668 


15 


33 


64 


NA 


44 


141 


96 


57 


249 


163 


70 


389 


249 


90 


560 


357 


105 


765 


490 


124 


1,002 


648 


20 


56 


58 


NA 


53 


132 


90 


66 


237 


154 


80 


374 


237 


102 


542 


343 


119 


743 


473 


139 


977 


628 


30 


NA 


NA 


NA 


73 


113 


NA 


88 


214 


NA 


104 


346 


219 


131 


507 


321 


149 


702 


444 


171 


929 


594 


50 








101 


67 





216 


134 





397 


232 





633 


363 





932 


518 





1,297 


708 





1,730 


952 


2 


8 


86 


61 


11 


183 


122 


14 


320 


206 


15 


497 


314 


22 


715 


445 


26 


975 


615 


33 


1,276 


813 


5 


20 


82 


NA 


27 


177 


119 


35 


312 


200 


43 


487 


308 


55 


702 


438 


65 


960 


605 


77 


1,259 


798 


10 


26 


76 


NA 


35 


168 


114 


45 


299 


190 


56 


471 


298 


73 


681 


426 


86 


935 


589 


101 


1,230 


773 


15 


59 


70 


NA 


42 


158 


NA 


54 


287 


180 


66 


455 


288 


85 


662 


413 


100 


911 


572 


117 


1,203 


747 


20 


NA 


NA 


NA 


50 


149 


NA 


63 


275 


169 


76 


440 


278 


97 


642 


401 


113 


888 


556 


131 


1,176 


722 


30 


NA 


NA 


NA 


69 


131 


NA 


84 


250 


NA 


99 


410 


259 


123 


605 


376 


141 


844 


522 


161 


1,125 


670 


100 





NA 


NA 


NA 





218 


NA 





407 


NA 





665 


400 





997 


560 





1,411 


770 





1,908 


1,040 


2 


NA 


NA 


NA 


10 


194 


NA 


12 


354 


NA 


13 


566 


375 


18 


831 


510 


21 


1,155 


700 


25 


1,536 


935 


5 


NA 


NA 


NA 


26 


189 


NA 


33 


347 


NA 


40 


557 


369 


52 


820 


504 


60 


1,141 


692 


71 


1,519 


926 


10 


NA 


NA 


NA 


33 


182 


NA 


43 


335 


NA 


53 


542 


361 


68 


801 


493 


80 


1,118 


679 


94 


1,492 


910 


15 


NA 


NA 


NA 


40 


174 


NA 


50 


321 


NA 


62 


528 


353 


80 


782 


482 


93 


1,095 


666 


109 


1,465 


895 


20 


NA 


NA 


NA 


47 


166 


NA 


59 


311 


NA 


71 


513 


344 


90 


763 


471 


105 


1,073 


653 


122 


1,438 


880 


30 


NA 


NA 


NA 


NA 


NA 


NA 


78 


290 


NA 


92 


483 


NA 


115 


726 


449 


131 


1,029 


627 


149 


1,387 


849 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


147 


428 


NA 


180 


651 


405 


197 


944 


575 


217 


1,288 


787 



(continued) 



U) 



TABLE 504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



m 

3D 

z 
> 

H 

O 

Z 
> 
r- 
1} 

c 
m 

r- 

O 

> 

o 

O 
D 

m 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


VENT DIAMETER— (D) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 








1,121 


570 





1,645 


850 





2,267 


1,170 





2,983 


1,530 





3,802 


1,960 





4,721 


2,430 





5,737 


2,950 





6,853 


3,520 


2 


75 


675 


455 


103 


982 


650 


138 


1,346 


890 


178 


1,769 


1,170 


225 


2,250 


1,480 


296 


2,782 


1,850 


360 


3,377 


2,220 


426 


4,030 


2,670 


4 


110 


668 


445 


147 


975 


640 


191 


1,338 


880 


242 


1,761 


1,160 


300 


2,242 


1,475 


390 


2,774 


1,835 


469 


3,370 


2,215 


555 


4,023 


2,660 


6 


128 


661 


435 


171 


967 


630 


219 


1,330 


870 


276 


1,753 


1,150 


341 


2,235 


1,470 


437 


2,767 


1,820 


523 


3,363 


2,210 


618 


4,017 


2,650 


8 








1,261 


660 





1,858 


970 





2,571 


1,320 





3,399 


1,740 





4,333 


2,220 





5,387 


2,750 





6,555 


3,360 





7,838 


4,010 


2 


71 


770 


515 


98 


1,124 


745 


130 


1,543 


1,020 


168 


2,030 


1,340 


212 


2,584 


1,700 


278 


3,196 


2,110 


336 


3,882 


2,560 


401 


4,634 


3,050 


5 


115 


758 


503 


154 


1,110 


733 


199 


1,528 


1,010 


251 


2,013 


1,330 


311 


2,563 


1,685 


398 


3,180 


2,090 


476 


3,863 


2,545 


562 


4,612 


3,040 


8 


137 


746 


490 


180 


1,097 


720 


231 


1,514 


1,000 


289 


2,000 


1,320 


354 


2,552 


1,670 


450 


3,163 


2,070 


537 


3,850 


2,530 


630 


4,602 


3,030 


10 








1,377 


720 





2,036 


1,060 





2,825 


1,450 





3,742 


1,925 





4,782 


2,450 





5,955 


3,050 





7,254 


3,710 





8,682 


4,450 


2 


68 


852 


560 


93 


1,244 


850 


124 


1,713 


1,130 


161 


2,256 


1,480 


202 


2,868 


1,890 


264 


3,556 


2,340 


319 


4,322 


2,840 


378 


5,153 


3,390 


5 


112 


839 


547 


149 


1,229 


829 


192 


1,696 


1,105 


243 


2,238 


1,461 


300 


2,849 


1,871 


382 


3,536 


2,318 


458 


4,301 


2,818 


540 


5,132 


3,371 


10 


142 


817 


525 


187 


1,204 


795 


238 


1,669 


1,080 


298 


2,209 


1,430 


364 


2,818 


1,840 


459 


3,504 


2,280 


546 


4,268 


2,780 


641 


5,099 


3,340 


15 








1,596 


840 





2,380 


1,240 





3,323 


1,720 





4,423 


2,270 





5,678 


2,900 





7,099 


3,620 





8,665 


4,410 





10,393 


5,300 


2 


63 


1,019 


675 


86 


1,495 


985 


114 


2,062 


1,350 


147 


2,719 


1,770 


186 


3,467 


2,260 


239 


4,304 


2,800 


290 


5,232 


3,410 


346 


6,251 


4,080 


5 


105 


1,003 


660 


140 


1,476 


967 


182 


2,041 


1,327 


229 


2,696 


1,748 


283 


3,442 


2,235 


355 


4,278 


2,777 


426 


5,204 


3,385 


501 


6,222 


4,057 


10 


135 


977 


635 


177 


1,446 


936 


227 


2,009 


1,289 


283 


2,659 


1,712 


346 


3,402 


2,193 


432 


4,234 


2,739 


510 


5,159 


3,343 


599 


6,175 


4,019 


15 


155 


953 


610 


202 


1,418 


905 


257 


1,976 


1,250 


318 


2,623 


1,675 


385 


3,363 


2,150 


479 


4,192 


2,700 


564 


5,115 


3,300 


665 


6,129 


3,980 


20 








1,756 


930 





2,637 


1,350 





3,701 


1,900 





4,948 


2,520 





6,376 


3,250 





7,988 


4,060 





9,785 


4,980 





11,753 


6,000 


2 


59 


1,150 


755 


81 


1,694 


1,100 


107 


2,343 


1,520 


139 


3,097 


2,000 


175 


3,955 


2,570 


220 


4,916 


3,200 


269 


5,983 


3,910 


321 


7,154 


4,700 


5 


101 


1,133 


738 


135 


1,674 


1,079 


174 


2,320 


1,498 


219 


3,071 


1,978 


270 


3,926 


2,544 


337 


4,885 


3,174 


403 


5,950 


3,880 


475 


7,119 


4,662 


10 


130 


1,105 


710 


172 


1,641 


1,045 


220 


2,282 


1,460 


273 


3,029 


1,940 


334 


3,880 


2,500 


413 


4,835 


3,130 


489 


5,896 


3,830 


573 


7,063 


4,600 


15 


150 


1,078 


688 


195 


1,609 


1,018 


248 


2,245 


1,425 


306 


2,988 


1,910 


372 


3,835 


2,465 


459 


4,786 


3,090 


541 


5,844 


3,795 


631 


7,007 


4,575 


20 


167 


1,052 


665 


217 


1,578 


990 


273 


2,210 


1,390 


335 


2,948 


1,880 


404 


3,791 


2,430 


495 


4,737 


3,050 


585 


5,792 


3,760 


689 


6,953 


4,550 



(continued) 



TABLE 504.2(1)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Connected directly to vent 



HEIGHT 

(H) 

(feet) 


LATERAL 
(feet) 


VENT DIAMETER— (O) inches 


10 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 








1,977 


1,060 





3,004 


1,550 





4,252 


2,170 





5,725 


2,920 





7,420 


3,770 





9,341 


4,750 





11,483 


5,850 





13,848 


7,060 


2 


54 


1,351 


865 


74 


2,004 


1,310 


98 


2,786 


1,800 


127 


3,696 


2,380 


159 


4,734 


3,050 


199 


5,900 


3,810 


241 


7,194 


4,650 


285 


8,617 


5,600 


5 


96 


1,332 


851 


127 


1,981 


1,289 


164 


2,759 


1,775 


206 


3,666 


2,350 


252 


4,701 


3,020 


312 


5,863 


3,783 


373 


7,155 


4,622 


439 


8,574 


5,552 


10 


125 


1,301 


829 


164 


1,944 


1,254 


209 


2,716 


1,733 


259 


3,617 


2,300 


316 


4,647 


2,970 


386 


5,803 


3,739 


456 


7,090 


4,574 


535 


8,505 


5,471 


15 


143 


1,272 


807 


187 


1,908 


1,220 


237 


2,674 


1,692 


292 


3,570 


2,250 


354 


4,594 


2,920 


431 


5,744 


3,695 


507 


7,026 


4,527 


590 


8,437 


5,391 


20 


160 


1,243 


784 


207 


1,873 


1,185 


260 


2,633 


1,650 


319 


3,523 


2,200 


384 


4,542 


2,870 


467 


5,686 


3,650 


548 


6,964 


4,480 


639 


8,370 


5,310 


30 


195 


1,189 


745 


246 


1,807 


1,130 


305 


2,555 


1,585 


369 


3,433 


2,130 


440 


4,442 


2,785 


540 


5,574 


3,565 


635 


6,842 


4,375 


739 


8,239 


5,225 


50 








2,231 


1,195 





3,441 


1,825 





4,934 


2,550 





6,711 


3,440 





8,774 


4,460 





11,129 


5,635 





13,767 


6,940 





16,694 


8,430 


2 


41 


1,620 


1,010 


66 


2,431 


1,513 


86 


3,409 


2,125 


113 


4,554 


2,840 


141 


5,864 


3,670 


171 


7,339 


4,630 


209 


8,980 


5,695 


251 


10,788 


6,860 


5 


90 


1,600 


996 


118 


2,406 


1,495 


151 


3,380 


2,102 


191 


4,520 


2,813 


234 


5,826 


3,639 


283 


7,295 


4,597 


336 


8,933 


5,654 


394 


10,737 


6,818 


10 


118 


1,567 


972 


154 


2,366 


1,466 


196 


3,332 


2,064 


243 


4,464 


2,767 


295 


5,763 


3,585 


355 


7,224 


4,542 


419 


8,855 


5,585 


491 


10,652 


6,749 


15 


136 


1,536 


948 


177 


2,327 


1,437 


222 


3,285 


2,026 


274 


4,409 


2,721 


330 


5,701 


3,534 


396 


7,155 


4,511 


465 


8,779 


5,546 


542 


10,570 


6,710 


20 


151 


1,505 


924 


195 


2,288 


1,408 


244 


3,239 


1,987 


300 


4,356 


2,675 


361 


5,641 


3,481 


433 


7,086 


4,479 


506 


8,704 


5,506 


586 


10,488 


6,670 


30 


183 


1,446 


876 


232 


2,214 


1,349 


287 


3,150 


1,910 


347 


4,253 


2,631 


412 


5,523 


3,431 


494 


6,953 


4,421 


577 


8,557 


5,444 


672 


10,328 


6,603 


100 








2,491 


1,310 





3,925 


2,050 





5,729 


2,950 





7,914 


4,050 





10,485 


5,300 





13,454 


6,700 





16,817 


8,600 





20,578 


10,300 


2 


30 


1,975 


1,170 


44 


3,027 


1,820 


72 


4,313 


2,550 


95 


5,834 


3,500 


120 


7,591 


4,600 


138 


9,577 


5,800 


169 


11,803 


7,200 


204 


14,264 


8,800 


5 


82 


1,955 


1,159 


107 


3,002 


1,803 


136 


4,282 


2,531 


172 


5,797 


3,475 


208 


7,548 


4,566 


245 


9,528 


5,769 


293 


11,748 


7,162 


341 


14,204 


8,756 


10 


108 


1,923 


1,142 


142 


2,961 


1,775 


180 


4,231 


2,500 


223 


5,737 


3,434 


268 


7,478 


4,509 


318 


9,447 


5,717 


374 


11,658 


7,100 


436 


14,105 


8,683 


15 


126 


1,892 


1,124 


163 


2,920 


1,747 


206 


4,182 


2,469 


252 


5,678 


3,392 


304 


7,409 


4,451 


358 


9,367 


5,665 


418 


11,569 


7,037 


487 


14,007 


8,610 


20 


141 


1,861 


1,107 


181 


2,880 


1,719 


226 


4,133 


2,438 


277 


5,619 


3,351 


330 


7,341 


4,394 


387 


9,289 


5,613 


452 


11,482 


6,975 


523 


13,910 


8,537 


30 


170 


1,802 


1,071 


215 


2,803 


1,663 


265 


4,037 


2,375 


319 


5,505 


3,267 


378 


7,209 


4,279 


446 


9,136 


5,509 


514 


11,310 


6,850 


592 


13,720 


8,391 


50 


241 


1,688 


1,000 


292 


2,657 


1,550 


350 


3,856 


2,250 


415 


5,289 


3,100 


486 


6,956 


4,050 


572 


8,841 


5,300 


659 


10,979 


6,600 


752 


13,354 


8,100 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W. 



U) 



TABLE 504.2(2) 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(H) 
(feet) 


LATERAL 

m 

(feet) 


VENT DIAMETER— (D) inches 


3456789 10 12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 





38 


77 


45 


59 


151 


85 


85 


249 


140 


126 


373 


204 


165 


522 


284 


211 


695 


369 


267 


894 


469 


371 


1,118 


569 


537 


1,639 


849 


2 


39 


51 


36 


60 


96 


66 


85 


156 


104 


123 


231 


156 


159 


320 


213 


201 


423 


284 


251 


541 


368 


347 


673 


453 


498 


979 


648 


4 


NA 


NA 


33 


74 


92 


63 


102 


152 


102 


146 


225 


152 


187 


313 


208 


237 


416 


277 


295 


533 


360 


409 


664 


443 


584 


971 


638 


6 


NA 


NA 


31 


83 


89 


60 


114 


147 


99 


163 


220 


148 


207 


307 


203 


263 


409 


271 


327 


526 


352 


449 


656 


433 


638 


962 


627 


8 





37 


83 


50 


58 


164 


93 


83 


273 


154 


123 


412 


234 


161 


580 


319 


206 


777 


414 


258 


1,002 


536 


360 


1,257 


658 


521 


1,852 


967 


2 


39 


56 


39 


59 


108 


75 


83 


176 


119 


121 


261 


179 


155 


363 


246 


197 


482 


321 


246 


617 


417 


339 


768 


513 


486 


1,120 


743 


5 


NA 


NA 


37 


77 


102 


69 


107 


168 


114 


151 


252 


171 


193 


352 


235 


245 


470 


311 


305 


604 


404 


418 


754 


500 


598 


1,104 


730 


8 


NA 


NA 


33 


90 


95 


64 


122 


161 


107 


175 


243 


163 


223 


342 


225 


280 


458 


300 


344 


591 


392 


470 


740 


486 


665 


1,089 


715 


10 





37 


87 


53 


57 


174 


99 


82 


293 


165 


120 


444 


254 


158 


628 


344 


202 


844 


449 


253 


1,093 


584 


351 


1,373 


718 


507 


2,031 


1,057 


2 


39 


61 


41 


59 


117 


80 


82 


193 


128 


119 


287 


194 


153 


400 


272 


193 


531 


354 


242 


681 


456 


332 


849 


559 


475 


1,242 


848 


5 


52 


56 


39 


76 


111 


76 


105 


185 


122 


148 


277 


186 


190 


388 


261 


241 


518 


344 


299 


667 


443 


409 


834 


544 


584 


1,224 


825 


10 


NA 


NA 


34 


97 


100 


68 


132 


171 


112 


188 


261 


171 


237 


369 


241 


296 


497 


325 


363 


643 


423 


492 


808 


520 


688 


1,194 


788 


15 





36 


93 


57 


56 


190 


111 


80 


325 


186 


116 


499 


283 


153 


713 


388 


195 


966 


523 


244 


1,259 


681 


336 


1,591 


838 


488 


2,374 


1,237 


2 


38 


69 


47 


57 


136 


93 


80 


225 


149 


115 


337 


224 


148 


473 


314 


187 


631 


413 


232 


812 


543 


319 


1,015 


673 


457 


1,491 


983 


5 


51 


63 


44 


75 


128 


86 


102 


216 


140 


144 


326 


217 


182 


459 


298 


231 


616 


400 


287 


795 


526 


392 


997 


657 


562 


1,469 


963 


10 


NA 


NA 


39 


95 


116 


79 


128 


201 


131 


182 


308 


203 


228 


438 


284 


284 


592 


381 


349 


768 


501 


470 


966 


628 


664 


1,433 


928 


15 


NA 


NA 


NA 


NA 


NA 


72 


158 


186 


124 


220 


290 


192 


272 


418 


269 


334 


568 


367 


404 


742 


484 


540 


937 


601 


750 


1,399 


894 


20 





35 


96 


60 


54 


200 


118 


78 


346 


201 


114 


537 


306 


149 


772 


428 


190 


1,053 


573 


238 


1,379 


750 


326 


1,751 


927 


473 


2,631 


1,346 


2 


37 


74 


50 


56 


148 


99 


78 


248 


165 


113 


375 


248 


144 


528 


344 


182 


708 


468 


227 


914 


611 


309 


1,146 


754 


443 


1,689 


1,098 


5 


50 


68 


47 


73 


140 


94 


100 


239 


158 


141 


363 


239 


178 


514 


334 


224 


692 


457 


279 


896 


596 


381 


1,126 


734 


547 


1,665 


1,074 


10 


NA 


NA 


41 


93 


129 


86 


125 


223 


146 


177 


344 


224 


222 


491 


316 


277 


666 


437 


339 


866 


570 


457 


1,092 


702 


646 


1,626 


1,037 


15 


NA 


NA 


NA 


NA 


NA 


80 


155 


208 


136 


216 


325 


210 


264 


469 


301 


325 


640 


419 


393 


838 


549 


526 


1,060 


677 


730 


1,587 


1,005 


20 


NA 


NA 


NA 


NA 


NA 


NA 


186 


192 


126 


254 


306 


196 


309 


448 


285 


374 


616 


400 


448 


810 


526 


592 


1,028 


651 


808 


1,550 


973 



(continued) 



TABLE 504.2(2)— continued 
TYPE B DOUBLE-WALL GAS VENT 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



HEIGHT 

(H) 

(feet) 


LATERAL 

{L) 

(feet) 


VENT DIAMETER— (D) inches 


3 4 


5 1 6 1 7 1 8 1 9 1 10 1 12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 





34 


99 


63 


53 


211 


127 


76 


372 


219 


110 


584 


334 


144 


849 


472 


184 


1,168 


647 


229 


1,542 


852 


312 


1,971 


1,056 


454 


2,996 


1,545 


2 


37 


80 


56 


55 


164 


111 


76 


281 


183 


109 


429 


279 


139 


610 


392 


175 


823 


533 


219 


1,069 


698 


296 


1,346 


863 


424 


1,999 


1,308 


5 


49 


74 


52 


72 


157 


106 


98 


271 


173 


136 


417 


271 


171 


595 


382 


215 


806 


521 


269 


1,049 


684 


366 


1,324 


846 


524 


1,971 


1,283 


10 


NA 


NA 


NA 


91 


144 


98 


122 


255 


168 


171 


397 


257 


213 


570 


367 


265 


777 


501 


327 


1,017 


662 


440 


1,287 


821 


620 


1,927 


1,234 


15 


NA 


NA 


NA 


115 


131 


NA 


151 


239 


157 


208 


377 


242 


255 


547 


349 


312 


750 


481 


379 


985 


638 


507 


1,251 


794 


702 


1,884 


1,205 


20 


NA 


NA 


NA 


NA 


NA 


NA 


181 


223 


NA 


246 


357 


228 


298 


524 


333 


360 


723 


461 


433 


955 


615 


570 


1,216 


768 


780 


1,841 


1,166 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


389 


477 


305 


461 


670 


426 


541 


895 


574 


704 


1,147 


720 


937 


1,759 


1,101 


50 





33 


99 


66 


51 


213 


133 


73 


394 


230 


105 


629 


361 


138 


928 


515 


176 


1,292 


704 


220 


1,724 


948 


295 


2,223 


1,189 


428 


3,432 


1,818 


2 


36 


84 


61 


53 


181 


121 


73 


318 


205 


104 


495 


312 


133 


712 


443 


168 


971 


613 


209 


1,273 


811 


280 


1,615 


1,007 


401 


2,426 


1,509 


5 


48 


80 


NA 


70 


174 


117 


94 


308 


198 


131 


482 


305 


164 


696 


435 


204 


953 


602 


257 


1,252 


795 


347 


1,591 


991 


496 


2,396 


1,490 


10 


NA 


NA 


NA 


89 


160 


NA 


118 


292 


186 


162 


461 


292 


203 


671 


420 


253 


923 


583 


313 


1,217 


765 


418 


1,551 


963 


589 


2,347 


1,455 


15 


NA 


NA 


NA 


112 


148 


NA 


145 


275 


174 


199 


441 


280 


244 


646 


405 


299 


894 


562 


363 


1,183 


736 


481 


1,512 


934 


668 


2,299 


1,421 


20 


NA 


NA 


NA 


NA 


NA 


NA 


176 


257 


NA 


236 


420 


267 


285 


622 


389 


345 


866 


543 


415 


1,150 


708 


544 


1,473 


906 


741 


2,251 


1,387 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


315 


376 


NA 


373 


573 


NA 


442 


809 


502 


521 


1,086 


649 


674 


1,399 


848 


892 


2,159 


1,318 


100 





NA 


NA 


NA 


49 


214 


NA 


69 


403 


NA 


100 


659 


395 


131 


991 


555 


166 


1,404 


765 


207 


1,900 


1,033 


273 


2,479 


1,300 


395 


3,912 


2,042 


2 


NA 


NA 


NA 


51 


192 


NA 


70 


351 


NA 


98 


563 


373 


125 


828 


508 


158 


1,152 


698 


196 


1,532 


933 


259 


1,970 


1,168 


371 


3,021 


1,817 


5 


NA 


NA 


NA 


67 


186 


NA 


90 


342 


NA 


125 


551 


366 


156 


813 


501 


194 


1,134 


688 


240 


1,511 


921 


322 


1,945 


1,153 


460 


2,990 


1,796 


10 


NA 


NA 


NA 


85 


175 


NA 


113 


324 


NA 


153 


532 


354 


191 


789 


486 


238 


1,104 


672 


293 


1,477 


902 


389 


1,905 


1,133 


547 


2,938 


1,763 


15 


NA 


NA 


NA 


132 


162 


NA 


138 


310 


NA 


188 


511 


343 


230 


764 


473 


281 


1,075 


656 


342 


1,443 


884 


447 


1,865 


1,110 


618 


2,888 


1,730 


20 


NA 


NA 


NA 


NA 


NA 


NA 


168 


295 


NA 


224 


487 


NA 


270 


739 


458 


325 


1,046 


639 


391 


1,410 


864 


507 


1,825 


1,087 


690 


2,838 


1,696 


30 


NA 


NA 


NA 


NA 


NA 


NA 


231 


264 


NA 


301 


448 


NA 


355 


685 


NA 


418 


988 


NA 


491 


1,343 


824 


631 


1,747 


1,041 


834 


2,739 


1,627 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


540 


584 


NA 


617 


866 


NA 


711 


L205 


NA 


895 


1,591 


NA 


1,138 


2,547 


1,489 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



O 



O) 



TABLE 504.2(3) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double- wall connector 



m 

33 

z 
> 

H 
O 

z 
> 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAIVIETER— (^) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


IVIax 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


320 


NA 


NA 


401 


NA 


NA 


581 


5 


NA 


NA 


25 


NA 


NA 


49 


NA 


NA 


82 


NA 


NA 


117 


NA 


NA 


165 


NA 


NA 


231 


NA 


NA 


298 


NA 


NA 


376 


NA 


NA 


561 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


198 


NA 


NA 


266 


84 


590 


350 


100 


728 


446 


139 


1,024 


651 


5 


NA 


NA 


26 


NA 


NA 


52 


NA 


NA 


88 


NA 


NA 


134 


NA 


NA 


183 


NA 


NA 


247 


NA 


NA 


328 


149 


711 


423 


201 


1,007 


640 


8 


NA 


NA 


24 


NA 


NA 


48 


NA 


NA 


83 


NA 


NA 


127 


NA 


NA 


175 


NA 


NA 


239 


NA 


NA 


318 


173 


695 


410 


231 


990 


623 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


103 


NA 


NA 


162 


NA 


NA 


221 


68 


519 


298 


82 


655 


388 


98 


810 


491 


136 


1,144 


724 


5 


NA 


NA 


28 


NA 


NA 


57 


NA 


NA 


96 


NA 


NA 


148 


NA 


NA 


204 


NA 


NA 


277 


124 


638 


365 


146 


791 


466 


196 


1,124 


712 


10 


NA 


NA 


25 


NA 


NA 


50 


NA 


NA 


87 


NA 


NA 


139 


NA 


NA 


191 


NA 


NA 


263 


155 


610 


347 


182 


762 


444 


240 


1,093 


668 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


114 


NA 


NA 


179 


53 


475 


250 


64 


613 


336 


77 


779 


441 


92 


968 


562 


127 


1,376 


841 


5 


NA 


NA 


35 


NA 


NA 


62 


NA 


NA 


107 


NA 


NA 


164 


NA 


NA 


231 


99 


594 


313 


118 


759 


416 


139 


946 


533 


186 


1,352 


828 


10 


NA 


NA 


28 


NA 


NA 


55 


NA 


NA 


97 


NA 


NA 


153 


NA 


NA 


216 


126 


565 


296 


148 


727 


394 


173 


912 


567 


229 


1,315 


777 


15 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


89 


NA 


NA 


141 


NA 


NA 


201 


NA 


NA 


281 


171 


698 


375 


198 


880 


485 


259 


1,280 


742 


20 


2 


NA 


NA 


38 


NA 


NA 


74 


NA 


NA 


124 


NA 


NA 


201 


51 


522 


274 


61 


678 


375 


73 


867 


491 


87 


1,083 


627 


121 


1,548 


953 


5 


NA 


NA 


36 


NA 


NA 


68 


NA 


NA 


116 


NA 


NA 


184 


80 


503 


254 


95 


658 


350 


113 


845 


463 


133 


1,059 


597 


179 


1,523 


933 


10 


NA 


NA 


NA 


NA 


NA 


60 


NA 


NA 


107 


NA 


NA 


172 


NA 


NA 


237 


122 


627 


332 


143 


811 


440 


167 


1,022 


566 


221 


1,482 


879 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


97 


NA 


NA 


159 


NA 


NA 


220 


NA 


NA 


314 


165 


780 


418 


191 


987 


541 


251 


1,443 


840 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


83 


NA 


NA 


148 


NA 


NA 


206 


NA 


NA 


296 


186 


750 


397 


214 


955 


513 


277 


1,406 


807 



(continued) 



m 

r- 

O 

> 

o 
o 
o 
m 



m 

33 

z 
> 

H 
O 

z 
> 



TABLE 504.2(3)— continued 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



HEIGHT 

(H) 

(feet) 


LATERAL 

{L) 

(feet) 


TYPE B DOUBLE-WALL CONNECTOR DIAMETER— <D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


82 


NA 


NA 


137 


NA 


NA 


216 


47 


581 


303 


57 


762 


421 


68 


985 


558 


81 


1,240 


717 


111 


1,793 


1,112 


5 


NA 


NA 


NA 


NA 


NA 


76 


NA 


NA 


128 


NA 


NA 


198 


75 


561 


281 


90 


741 


393 


106 


962 


526 


125 


1,216 


683 


169 


1,766 


1,094 


10 


NA 


NA 


NA 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


184 


NA 


NA 


263 


115 


709 


373 


135 


927 


500 


158 


1,176 


648 


210 


1,721 


1,025 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


107 


NA 


NA 


171 


NA 


NA 


243 


NA 


NA 


353 


156 


893 


476 


181 


1,139 


621 


239 


1,679 


981 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


159 


NA 


NA 


227 


NA 


NA 


332 


176 


860 


450 


203 


1,103 


592 


264 


1,638 


940 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


188 


NA 


NA 


288 


NA 


NA 


416 


249 


1,035 


555 


318 


1,560 


877 


50 


2 


NA 


NA 


NA 


NA 


NA 


92 


NA 


NA 


161 


NA 


NA 


251 


NA 


NA 


351 


51 


840 


477 


61 


1,106 


633 


72 


1,413 


812 


99 


2,080 


1,243 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


151 


NA 


NA 


230 


NA 


NA 


323 


83 


819 


445 


98 


1,083 


596 


116 


1,387 


774 


155 


2,052 


1,225 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


138 


NA 


NA 


215 


NA 


NA 


304 


NA 


NA 


424 


126 


1,047 


567 


147 


1,347 


733 


195 


2,006 


1,147 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


127 


NA 


NA 


199 


NA 


NA 


282 


NA 


NA 


400 


146 


1,010 


539 


170 


1,307 


702 


222 


1,961 


1,099 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


185 


NA 


NA 


264 


NA 


NA 


376 


165 


977 


511 


190 


1,269 


669 


246 


1,916 


1,050 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


327 


NA 


NA 


468 


233 


1,196 


623 


295 


1,832 


984 


Minimum Internal 

Area of Chimney 

(square inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum hitemal 

Area of Chimney 

(square inches) 


49 


88 


137 


198 


269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



Z 
m 
-< 
(/) 



(/} 



TABLE 504.2(4) 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single- wall metal connector 



o 



m 

-< 



o 

z 
> 

l- 
■n 

c 
m 

i- 

o 

> 

0) 

o 
o 
o 
m 



HEIGHT 

(H) 
(feet) 


LATERAL 

(L) 

(feet) 


SINGLE-WALL METAL CONNECTOR DIAMETER— (D) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 


7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA 


130 


NA 


NA 


180 


NA 


NA 


247 


NA 


NA 


319 


NA 


NA 


400 


NA 


NA 


580 


5 


NA 


NA 


25 


NA 


NA 


48 


NA 


NA 


81 


NA 


NA 


116 


NA 


NA 


164 


NA 


NA 


230 


NA 


NA 


297 


NA 


NA 


375 


NA 


NA 


560 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA 


145 


NA 


NA 


197 


NA 


NA 


265 


NA 


NA 


349 


382 


725 


445 


549 


1,021 


650 


5 


NA 


NA 


26 


NA 


NA 


51 


NA 


NA 


87 


NA 


NA 


133 


NA 


NA 


182 


NA 


NA 


246 


NA 


NA 


327 


NA 


NA 


422 


673 


1,003 


638 


8 


NA 


NA 


23 


NA 


NA 


47 


NA 


NA 


82 


NA 


NA 


126 


NA 


NA 


174 


NA 


NA 


237 


NA 


NA 


317 


NA 


NA 


408 


747 


985 


621 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


102 


NA 


NA 


161 


NA 


NA 


220 


216 


518 


297 


271 


654 


387 


373 


808 


490 


536 


1,142 


722 


5 


NA 


NA 


28 


NA 


NA 


56 


NA 


NA 


95 


NA 


NA 


147 


NA 


NA 


203 


NA 


NA 


276 


334 


635 


364 


459 


789 


465 


657 


1,121 


710 


10 


NA 


NA 


24 


NA 


NA 


49 


NA 


NA 


86 


NA 


NA 


137 


NA 


NA 


189 


NA 


NA 


261 


NA 


NA 


345 


547 


758 


441 


771 


1,088 


665 


15 


2 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


113 


NA 


NA 


178 


166 


473 


249 


211 


611 


335 


264 


776 


440 


362 


965 


560 


520 


1,373 


840 


5 


NA 


NA 


32 


NA 


NA 


61 


NA 


NA 


106 


NA 


NA 


163 


NA 


NA 


230 


261 


591 


312 


325 


775 


414 


444 


942 


531 


637 


1,348 


825 


10 


NA 


NA 


27 


NA 


NA 


54 


NA 


NA 


96 


NA 


NA 


151 


NA 


NA 


214 


NA 


NA 


294 


392 


722 


392 


531 


907 


504 


749 


1,309 


774 


15 


NA 


NA 


NA 


NA 


NA 


46 


NA 


NA 


87 


NA 


NA 


138 


NA 


NA 


198 


NA 


NA 


278 


452 


692 


372 


606 


873 


481 


841 


1,272 


738 


20 


2 


NA 


NA 


38 


NA 


NA 


73 


NA 


NA 


123 


NA 


NA 


200 


163 


520 


273 


206 


675 


374 


258 


864 


490 


252 


1,079 


625 


508 


1,544 


950 


5 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


115 


NA 


NA 


183 


80 


NA 


252 


255 


655 


348 


317 


842 


461 


433 


1,055 


594 


623 


1,518 


930 


10 


NA 


NA 


NA 


NA 


NA 


59 


NA 


NA 


105 


NA 


NA 


170 


NA 


NA 


235 


312 


622 


330 


382 


806 


437 


517 


1,016 


562 


733 


1,475 


875 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


95 


NA 


NA 


156 


NA 


NA 


217 


NA 


NA 


311 


442 


773 


414 


591 


979 


539 


823 


1,434 


835 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


80 


NA 


NA 


144 


NA 


NA 


202 


NA 


NA 


292 


NA 


NA 


392 


663 


944 


510 


911 


1,394 


800 



(continued) 



TABLE 504.2(4)— continued 
MASONRY CHIMNEY 



Number of Appliances 


Single 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



c 
m 

i- 

> 

(A 
O 
O 

a 
m 



HEIGHT 

(H) 
(feet) 


LATERAL 
(feet) 


SINGLE-WALL METAL CONNECTOR DIAMETER— (0) inches 
to be used with chimney areas within the size limits at bottom 


3 


4 


5 


6 7 


8 


9 


10 


12 


APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


30 


2 


NA 


NA 


41 


NA 


NA 


81 


NA 


NA 


136 


NA 


NA 


215 


158 


578 


302 


200 


759 


420 


249 


982 


556 


340 


1,237 


715 


489 


1,789 


1,110 


5 


NA 


NA 


NA 


NA 


NA 


75 


NA 


NA 


127 


NA 


NA 


196 


NA 


NA 


279 


245 


737 


391 


306 


958 


524 


417 


1,210 


680 


600 


1,760 


1,090 


10 


NA 


NA 


NA 


NA 


NA 


66 


NA 


NA 


113 


NA 


NA 


182 


NA 


NA 


260 


300 


703 


370 


370 


920 


496 


500 


1,168 


644 


708 


1,713 


1,020 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


105 


NA 


NA 


168 


NA 


NA 


240 


NA 


NA 


349 


428 


884 


471 


572 


1,128 


615 


798 


1,668 


975 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


88 


NA 


NA 


155 


NA 


NA 


223 


NA 


NA 


327 


NA 


NA 


445 


643 


1,089 


585 


883 


1,624 


932 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


182 


NA 


NA 


281 


NA 


NA 


408 


NA 


NA 


544 


1,055 


1,539 


865 


50 


2 


NA 


NA 


NA 


NA 


NA 


91 


NA 


NA 


160 


NA 


NA 


250 


NA 


NA 


350 


191 


837 


475 


238 


1,103 


631 


323 


1,408 


810 


463 


2,076 


1,240 


5 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


149 


NA 


NA 


228 


NA 


NA 


321 


NA 


NA 


442 


293 


1,078 


593 


398 


1,381 


770 


571 


2,044 


1,220 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


136 


NA 


NA 


212 


NA 


NA 


301 


NA 


NA 


420 


355 


1,038 


562 


447 


1,337 


728 


674 


1,994 


1,140 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


124 


NA 


NA 


195 


NA 


NA 


278 


NA 


NA 


395 


NA 


NA 


533 


546 


1,294 


695 


761 


1,945 


1,090 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


180 


NA 


NA 


258 


NA 


NA 


370 


NA 


NA 


504 


616 


1,251 


660 


844 


1,898 


1,040 


30 


NA 


NA 


NA 


NA 


NA 


48 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


318 


NA 


NA 


458 


NA 


NA 


610 


1,009 


1,805 


970 


Minimum 
Internal Area of 

Chimney 
(square inches) 


12 


19 


28 


38 


50 


63 


78 


95 


132 


Maximum 
Internal Area of 

Chimney 
(square inches) 


49 


88 


137 


198 


269 


352 


445 


550 


792 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm^, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W. 



O 



< 
m 



u> 



CHIMNEYS AND VENTS 



TABLE 504.2(5) 

SINGLE-WALL METAL PIPE OR TYPE B 

ASBESTOS CEMENT VENT 



Number of Appliances 


Single 


Appliance Type 


Draft hood equipped 


Appliance Vent Connection 


Connected directly to pipe or vent 



HEIGHT 
(feet) 


LATERAL 
(feet) 


VENT DIAMETER— (D) inches 


3 


4 


5 


6 


7 


8 


10 


12 


MAXIMUM APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6 





39 


70 


116 


170 


232 


312 


500 


750 


2 


31 


55 


94 


141 


194 


260 


415 


620 


5 


28 


51 


88 


128 


177 


242 


390 


600 


8 





42 


76 


126 


185 


252 


340 


542 


815 


2 


32 


61 


102 


154 


210 


284 


451 


680 


5 


29 


56 


95 


141 


194 


264 


430 


648 


10 


24 


49 


86 


131 


180 


250 


406 


625 


10 





45 


84 


138 


202 


279 


372 


606 


912 


2 


35 


67 


111 


168 


233 


311 


505 


760 


5 


32 


61 


104 


153 


215 


289 


480 


724 


10 


27 


54 


94 


143 


200 


274 


455 


700 


15 


NA 


46 


84 


130 


186 


258 


432 


666 


15 





49 


91 


151 


223 


312 


420 


684 


1,040 


2 


39 


72 


122 


186 


260 


350 


570 


865 


5 


35 


67 


110 


170 


240 


325 


540 


825 


10 


30 


58 


103 


158 


223 


308 


514 


795 


15 


NA 


50 


93 


144 


207 


291 


488 


760 


20 


NA 


NA 


82 


132 


195 


273 


466 


726 


20 





53 


101 


163 


252 


342 


470 


770 


1,190 


2 


42 


80 


136 


210 


286 


392 


641 


990 


5 


38 


74 


123 


192 


264 


364 


610 


945 


10 


32 


65 


115 


178 


246 


345 


571 


910 


15 


NA 


55 


104 


163 


228 


326 


550 


870 


20 


NA 


NA 


91 


149 


214 


306 


525 


832 


30 





56 


108 


183 


276 


384 


529 


878 


1,370 


2 


44 


84 


148 


230 


320 


441 


730 


1,140 


5 


NA 


78 


137 


210 


296 


410 


694 


1,080 


10 


NA 


68 


125 


196 


274 


388 


656 


1,050 


15 


NA 


NA 


113 


177 


258 


366 


625 


1,000 


20 


NA 


NA 


99 


163 


240 


344 


596 


960 


30 


NA 


NA 


NA 


NA 


192 


295 


540 


890 


50 





NA 


120 


210 


310 


443 


590 


980 


1,550 


2 


NA 


95 


171 


260 


370 


492 


820 


1,290 


5 


NA 


NA 


159 


234 


342 


474 


780 


1,230 


10 


NA 


NA 


146 


221 


318 


456 


730 


1,190 


15 


NA 


NA 


NA 


200 


292 


407 


705 


1,130 


20 


NA 


NA 


NA 


185 


276 


384 


670 


1,080 


30 


NA 


NA 


NA 


NA 


222 


330 


605 


1,010 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



100 



2006 INTERNATIONAL FUEL GAS CODE*" 



CHIMNEYS AND VENTS 





TABLE 504.2(6) 
EXTERIOR MASONRY CHIMNEY 


Number of Appliances w 


Single 




Appliance Type NAT 




Appliance Vent Connection Type B double-wall connector 


MINIMUM ALLOWABLE INPUT RATING OF SPACE-HEATING APPLIANCE 
IN THOUSANDS OF BTU PER HOUR 


VENT HEIGHT 
(feet) 


Internal area of chimney (square Inches) 


12 


19 


28 


38 


50 


63 


78 


113 


37°F or Greater 






Local 99% Winter Design Temperature: 37°F or Greater 




6 


























8 


























10 


























15 


NA 























20 


NA 


NA 


123 


190 


249 


184 








30 


NA 


NA 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


27 to 36°F 






Local 99% Winter Design Temperature: 27 to 36°F 




6 








68 


116 


156 


180 


212 


266 


8 








82 


127 


167 


187 


214 


263 


10 





51 


97 


141 


183 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


233 


253 


274 


305 


20 


NA 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


419 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


763 


17 to 26°F 






Local 99% Winter Design Temperature: 17 to 26°F 




6 


NA 


NA 


NA 


NA 


NA 


215 


259 


349 


8 


NA 


NA 


NA 


NA 


197 


226 


264 


352 


10 


NA 


NA 


NA 


NA 


214 


245 


278 


358 


15 


NA 


NA 


NA 


NA 


NA 


296 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


352 


387 


457 


30 


NA 


NA 


NA 


NA 


NA 


NA 


507 


581 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


5 to 16°F 






Local 99% Winter Design Temperature: 5 to 16°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


416 


8 


NA 


NA 


NA 


NA 


NA 


NA 


312 


423 


10 


NA 


NA 


NA 


NA 


NA 


289 


331 


430 


15 


NA 


NA 


NA 


NA 


NA 


NA 


393 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


450 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


972 


-10 to 4°F 






Local 99% Winter Design Temperature: -10 to 4°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


484 


8 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


494 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


513 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


586 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


650 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


805 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,003 


-11°F or Lower 






Local 99% Winter Design Temperature: -1 1°F or Lower 




Not recommended for any vent configurations 



Note: See Figure B-19 in Appendix B for a map showing local 99 percent winter design temperatures in the United States. 
For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



2006 INTERNATIONAL FUEL GAS CODE® 



101 



CHIMNEYS AND VENTS 



504.2.8 Vent area and diameter. Where the vertical vent 
has a larger diameter than the vent connector, the vertical 
vent diameter shall be used to determine the minimum vent 
capacity, and the connector diameter shall be used to deter- 
mine the maximum vent capacity. The flow area of the verti- 
cal vent shall not exceed seven times the flow area of the 
listed appliance categorized vent area, flue collar area, or 
draft hood outlet area unless designed in accordance with 
approved engineering methods. 

504.2.9 Chimney and vent locations. Tables 504.2(1), 
504.2(2), 504.2(3), 504.2(4) and 504.2(5) shall only be used 
for chimneys and vents not exposed to the outdoors below 
the roof line. A Type B vent or listed chimney lining system 
passing through an unused masonry chimney flue shall not 
be considered to be exposed to the outdoors. A Type B vent 
shall not be considered to be exposed to the outdoors where 
it passes through an unventilated enclosure or chase insu- 
lated to a value of not less than R8. 

Table 504.2(3) in combination with Table 504.2(6) shall 
be used for clay-tile-lined exterior masonry chimneys, pro- 
vided that all of the following are met: 

1. Vent connector is a Type B double wall. 

2. Vent connector length is limited to 1 Vj feet for each 
inch (18 nmi per mm) of vent connector diameter. 

3. The appliance is draft hood equipped. 

4. The input rating is less than the maximum capacity 
given by Table 504.2(3). 

5. For a water heater, the outdoor design temperature is 
not less than 5°F(-15°C). 

6. For a space-heating appliance, the input rating is 
greater than the minimum capacity given by Table 
504.2(6). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 

Exception: The installation of vents serving listed appli- 
ances shall be permitted to be in accordance with the 
appliance manufacturer's installation instructions. 

504.2.10 Corrugated vent connector size. Corrugated 
vent connectors shall be not smaller than the listed appli- 
ance categorized vent diameter, flue collar diameter, or draft 
hood outlet diameter. 

504.2.11 Vent connector size limitation. Vent connectors 
shall not be increased in size more than two sizes greater 
than the listed appliance categorized vent diameter, flue col- 
lar diameter, or draft hood outlet diameter. 

504.2.12 Component commingling. In a single run of vent 
or vent connector, different diameters and types of vent and 
connector components shall be permitted to be used, pro- 
vided that all such sizes and types are permitted by the 
tables. 

504.2.13 Draft hood conversion accessories. Draft hood 
conversion accessories for use with masonry chimneys 
venting listed Category I fan-assisted appliances shall be 



listed and installed in accordance with the manufacturer's 
installation instructions for such listed accessories. 

504.2.14 Table interpolation. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between the table entries (see Example 3, Appendix B). 

504.2.15 Extrapolation prohibited. Extrapolation beyond 
the table entries shall not be permitted. 

504.2.16 Engineering calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent capaci- 
ties. 

504.3 Application of multiple appliance vent Tables 
504.3(1) through 504.3(7). The application of Tables 504.3(1) 
through 504.3(7) shall be subject to the requirements of Sec- 
tions 504.3.1 through 504.3.27. 

504.3.1 Vent obstructions. These venting tables shall not 
be used where obstructions, as described in Section 503. 15, 
are installed in the venting system. The installation of vents 
serving listed appliances with vent dampers shall be in ac- 
cordance with the appliance manufacturer's instructions or 
in accordance with the following: 

1 . The maximum capacity of the vent connector shall be 
determined using the NAT Max column. 

2. The maximum capacity of the vertical vent or chim- 
ney shall be determined using the FAN-i-NAT column 
when the second appliance is a fan-assisted appliance, 
or the NAT+NAT column when the second appliance 
is equipped with a draft hood. 

3. The minimum capacity shall be determined as if the 
appliance were a fan-assisted appliance. 

3.1. The minimum capacity of the vent connector 
shall be determined using the FAN Min col- 
umn. 

3.2. The FAN+FAN column shall be used where 
the second appliance is a fan-assisted appli- 
ance, and the FAN-i-NAT colunm shall be 
used where the second appliance is equipped 
with a draft hood, to determine whether the 
vertical vent or chimney configuration is not 
permitted (NA). Where the vent configuration 
is NA, the vent configuration shall not be per- 
mitted and an alternative venting configura- 
tion shall be utilized. 

504.3.2 Connector length limit. The vent connector shall 
be routed to the vent utilizing the shortest possible route. 
Except as provided in Section 504.3.3, the maximum vent 
connector horizontal length shall be 1 Vj feet for each inch 
(457 nrni per mm) of connector diameter as shown in Table 
504.3.2. 

504.3.3 Connectors with longer lengths. Connectors with 
longer horizontal lengths than those listed in Section 
504.3.2 are permitted under the following conditions: 

1. The maximum capacity (FAN Max or NAT Max) of 
the vent connector shall be reduced 10 percent for 
each additional multiple of the length allowed by Sec- 



102 



2006 INTERNATIONAL FUEL GAS CODE"^ 



CHIMNEYS AND VENTS 



tion 504. 3 . 2. For example, the maximum length listed 
in Table 504.3.2 for a 4-inch (102 mm) connector is 6 
feet (1829 mm). With a connector length greater than 
6 feet (1829 mm) but not exceeding 12 feet (3658 
mm), the maximum capacity must be reduced by 10 
percent (0.90 x maximum vent connector capacity). 
With a connector length greater than 12 feet (3658 
mm) but not exceeding 18 feet (5486 mm), the maxi- 
mum capacity must be reduced by 20 percent (0.80 x 
maximum vent capacity). 

2. For a connector serving a fan-assisted appliance, the 
minimum capacity (FAN Min) of the connector shall 
be determined by referring to the corresponding sin- 
gle appliance table. For Type B double-wall connec- 
tors. Table 504.2(1) shall be used. For single- wall 
connectors, Table 504.2(2) shall be used. The height 
(H) and lateral (L) shall be measured according to the 
procedures for a single-appliance vent, as if the other 
appliances were not present. 

TABLE 504.3.2 
MAXIMUM VENT CONNECTOR LENGTH 



CONNECTOR DIAMETER MAXIMUM 
(Inches) 


CONNECTOR HORIZONTAL 
LENGTH (feet) 


3 


4V, 


4 


6 


5 


7V, 


6 


9 


7 


IOV2 


8 


12 


9 


I3V2 


10 


15 


12 


18 


14 


21 


16 


24 


18 


27 


20 


30 


22 


33 


24 


36 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 

504.3.4 Vent connector manifold. Where the vent connec- 
tors are combined prior to entering the vertical portion of the 
common vent to form a common vent manifold, the size of 
the common vent manifold and the common vent shall be 
determined by applying a 10-percent reduction (0.90 x 
maximum common vent capacity) to the common vent 
capacity part of the common vent tables. The length of the 
common vent connector manifold (L„) shall not exceed 1 V2 
feet for each inch (457 nmi per nmi) of common vent con- 
nector manifold diameter (D) (see Figure B-1 1). 

504.3.5 Common vertical vent offset. Where the common 
vertical vent is offset, the maximum capacity of the common 
vent shall be reduced in accordance with Section 504.3.6. 
The horizontal length of the common vent offset (LJ shall 



not exceed 1 V2 feet for each inch (457 mm per mm) of com- 
nion vent diameter. 

504.3.6 Elbows in vents. For each elbow up to and includ- 
ing 45 degrees (0.79 rad) in the common vent, the maximum 
common vent capacity listed in the venting tables shall be 
reduced by 5 percent. For each elbow greater than 45 de- 
grees (0.79 rad) up to and including 90 degrees (1.57 rad), 
the maximum common vent capacity Usted in the venting 
tables shall be reduced by 10 percent. 

504.3.7 Elbows in connectors. The vent connector capaci- 
ties listed in the common vent sizing tables include allow- 
ance for two 90-degree (1.57 rad) elbows. For each 
additional elbow up to and including 45 degrees (0.79 rad), 
the maximum vent connector capacity listed in the venting 
tables shall be reduced by 5 percent. For each elbow greater 
than 45 degrees (0.79 rad) up to and including 90 degrees 
(1.57 rad), the maximum vent connector capacity listed in 
the venting tables shall be reduced by 10 percent. 

504.3.8 Common vent minimum size. The cross-sectional 
area of the common vent shall be equal to or greater than the 
cross-sectional area of the largest connector. 

504.3.9 Common vent fittings. At the point where tee or 
wye fittings connect to a common vent, the opening size of 
the fitting shall be equal to the size of the common vent. 
Such fittings shall not be prohibited from having reduced- 
size openings at the point of connection of appliance vent 
connectors. 

504.3.9.1 Tee and wye fittings. Tee and wye fittings 
connected to a common vent shall be considered as part 
of the common vent and shall be constructed of materials 
consistent with that of the common vent. 

504.3.10 High-altitude installations. Sea-level input rat- 
ings shall be used when determining maximum capacity for 
high-altitude installation. Actual input (derated for altitude) 
shall be used for determining minimum capacity for 
high-altitude installation. 

504.3.11 Connector rise measurement. Connector rise 
(R) for each appliance connector shall be measured from the 
draft hood outlet or flue collar to the centerline where the 
vent gas streams come together. 

504.3.12 Vent height measurement. For multiple appli- 
ances all located on one floor, available total height (H) shall 
be measured from the highest draft hood outlet or flue collar 
up to the level of the outlet of the common vent. 

504.3.13 Multistory height measurement. For multistory 
installations, available total height (H) for each segment of 
the system shall be the vertical distance between the highest 
draft hood outlet or flue collar entering that segment and the 
centerline of the next higher interconnection tee (see Figure 
B-13). 

504.3.14 Multistory lowest portion sizing. The size of the 
lowest connector and of the vertical vent leading to the low- 
est interconnection of a multistory system shall be in accor- 
dance with Table 504.2(1) or 504.2(2) for available total 
height (H) up to the lowest interconnection (see Figure 
B-14). 



2006 INTERNATIONAL FUEL GAS CODE® 



103 



CHIMNEYS AND VENTS 



504.3.15 Multistory common vents. Where used in multi- 
story systems, vertical common vents shall be Type B dou- 
ble wall and shall be installed with a listed vent cap. 

504.3.16 Multistory common vent offsets. Offsets in mul- 
tistory common vent systems shall be limited to a single off- 
set in each system, and systems with an offset shall comply 
with all of the following: 

1. The offset angle shall not exceed 45 degrees (0.79 
rad) from vertical. 

2. The horizontal length of the offset shall not exceed 
1 V2 feet for each inch (457 mm per mm) of common 
vent diameter of the segment in which the offset is lo- 
cated. 

3 . For the segment of the common vertical vent contain- 
ing the offset, the common vent capacity listed in the 
common venting tables shall be reduced by 20 per- 
cent (0.80 X maximum common vent capacity). 

4. A multistory common vent shall not be reduced in 
size above the offset. 

504.3.17 Vertical vent maximum size. Where two or more 
appliances are connected to a vertical vent or chimney, the 
flow area of the largest section of vertical vent or chimney 
shall not exceed seven times the smallest listed appliance 
categorized vent areas, flue collar area, or draft hood outlet 
area unless designed in accordance with approved engineer- 
ing methods. 

504.3.18 Multiple input rate appliances. For appliances 
with more than one input rate, the minimum vent connector 
capacity (FAN Min) determined from the tables shall be less 
than the lowest appliance input rating, and the maximum 
vent connector capacity (FAN Max or NAT Max) deter- 
mined from the tables shall be greater than the highest appli- 
ance input rating. 

504.3.19 Liner system sizing and connections. Listed, 
corrugated metallic chimney liner systems in masonry 
chimneys shall be sized by using Table 504.3(1) or 504.3(2) 
for Type B vents, with the maximum capacity reduced by 20 
percent (0.80 x maximum capacity) and the minimum 
capacity as shown in Table 504.3(1) or 504.3(2). Corru- 
gated metallic liner systems installed with bends or offsets 
shall have their maximum capacity further reduced in accor- 
dance with Sections 504.3.5 and 504.3.6. The 20-percent 
reduction for corrugated metallic chimney liner systems 
includes an allowance for one long-radius 90-degree (1.57 
rad) turn at the bottom of the liner. Where double- wall con- 
nectors are required, tee and wye fittings used to connect to 
the common vent chimney liner shall be listed double-wall 
fittings. Connections between chimney liners and listed 
double-wall fittings shall be made with listed adapter fit- 
tings designed for such purpose. 

504.3.20 Chimney and vent location. Tables 504.3(1), 

I 504.3(2), 504.3(3), 504.3(4) and 504.3(5) shall only be used 
for chimneys and vents not exposed to the outdoors below 
the roof line. A Type B vent or listed chimney lining system 

(passing through an unused masonry chimney flue shall not 
be considered to be exposed to the outdoors. A Type B vent 
shall not be considered to be exposed to the outdoors where 



it passes through an unventilated enclosure or chase insu- I 
lated to a value of not less than R8. I 

Tables 504.3(6) and 504.3(7) shall be used for 
clay-tile-lined exterior masonry chimneys, provided all of 
the following conditions are met: 

1. Vent connector is Type B double wall. 

2. At least one appliance is draft hood equipped. 

3. The combined appliance input rating is less than the 
maximum capacity given by Table 504.3(6a) for 
NAT-hNAT or Table 504.3(7a) for FAN+NAT. 

4. The input rating of each space-heating appliance is 
greater than the minimum input rating given by Table 
504.3(6b) for NAT-i-NAT or Table 504.3(7b) for 

FAN+NAT. 

5 . The vent connector sizing is in accordance with Table 
504.3(3). 

Where these conditions cannot be met, an alternative 
venting design shall be used, such as a listed chimney lining 
system. 

Exception: Vents serving listed appliances installed in 
accordance with the appliance manufacturer's installa- 
tion instructions. 

504.3.21 Connector maximum and minimum size. Vent 
connectors shall not be increased in size more than two sizes 
greater than the listed appliance categorized vent diameter, 
flue collar diameter, or draft hood outlet diameter. Vent con- 
nectors for draft hood-equipped appliances shall not be 
smaller than the draft hood outlet diameter. Where a vent 
connector size(s) determined from the tables for a fan-as- 
sisted appliance(s) is smaller than the flue collar diameter, 
the use of the smaller size(s) shall be permitted provided that 
the installation complies with all of the following condi- 
tions: 

1 . Vent connectors for fan-assisted appliance flue col- 
lars 12 inches (305 mm) in diameter or smaller are not 
reduced by more than one table size [e.g., 12 inches to 
10 inches (305 mm to 254 mm) is a one-size reduc- 
tion] and those larger than 12 inches (305 mm) in di- 
ameter are not reduced more than two table sizes [e.g., 
24 inches to 20 inches (610 mm to 508 mm) is a 
two-size reduction]. 

2. The fan-assisted appliance(s) is common vented with 
a draft-hood-equipped appliances(s). 

3. The vent connector has a smooth interior wall. 

504.3.22 Component commingling. All combinations of 
pipe sizes, single-wall and double-wall metal pipe shall be 
allowed within any connector run(s) or within the common 
vent, provided that all of the appropriate tables permit all of 
the desired sizes and types of pipe, as if they were used for 
the entire length of the subject connector or vent. Where sin- 
gle-wall and Type B double-wall metal pipes are used for 
vent connectors within the same venting system, the com- 
mon vent must be sized using Table 504.3(2) or 504.3(4), as 
appropriate. 



104 



2006 INTERNATIONAL FUEL GAS CODE® 



CHIMNEYS AND VENTS 



504.3.23 Draft hood conversion accessories. Draft hood 
conversion accessories for use with masonry chimneys 
venting listed Category I fan-assisted appliances shall be 
listed and installed in accordance with the manufacturer's 
installation instructions for such listed accessories. 

504.3.24 Multiple sizes permitted. Where a table permits 
more than one diameter of pipe to be used for a connector or 
vent, all the permitted sizes shall be permitted to be used. 

504.3.25 Table interpolation. Interpolation shall be per- 
mitted in calculating capacities for vent dimensions that fall 
between table entries (see Appendix B, Example 3). 

504.3.26 Extrapolation prohibited. Extrapolation beyond 
the table entries shall not be permitted. 

504.3.27 Engineering calculations. For vent heights less 
than 6 feet (1829 mm) and greater than shown in the tables, 
engineering methods shall be used to calculate vent capaci- 
ties. 



506.3 Medium-heat appliances. Factory-built chimneys for 
medium-heat appliances producing flue gases having a tem- 
perature above 1,000°F (538°C), measured at the entrance to 
the chimney, shall be listed and labeled in accordance with UL 
959 and shall be installed and terminated in accordance with 
the manufacturer's installation instructions. 



SECTION 505 (IFGC) 

DIRECT-VENT, INTEGRAL VENT, 

MECHANICAL VENT AND 

VENTILATION/EXHAUST HOOD VENTING 

505.1 General. The installation of direct- vent and integral vent 
appliances shall be in accordance with Section 503. Mechani- 
cal venting systems and exhaust hood venting systems shall be 
designed and installed in accordance with Section 503. 

505.1.1 Commercial cooking appliances vented by 
exhaust hoods. Where commercial cooking appliances are 
vented by means of the Type I or II kitchen exhaust hood 
system that serves such appliances, the exhaust system shall 
be fan powered and the appliances shall be interlocked with 
the exhaust hood system to prevent appliance operation 
when the exhaust hood system is not operating. Where a 
solenoid valve is installed in the gas piping as part of an 
interlock system, gas piping shall not be installed to bypass 
such valve. Dampers shall not be installed in the exhaust 
system. 

Exception: An interlock between the cooking appli- 
ance(s) and the exhaust hood system shall not be required 
where heat sensors or other approved methods automati- 
cally activate the exhaust hood system when cooking 
operations occur. 



SECTION 506 (IFGC) 
FACTORY-BUILT CHIMNEYS 

506.1 Building heating appliances. Factory-built chimneys 
for building heating appliances producing flue gases having a 
temperature not greater than 1,000°F (538°C), measured at the 
entrance to the chimney, shall be listed and labeled in accor- 
dance with UL 103 and shall be installed and terminated in ac- 
cordance with the manufacturer's installation instructions. 

506.2 Support. Where factory-built chinineys are supported 
by structural members, such as joists and rafters, such members 
shall be designed to support the additional load. 



2006 INTERNATIONAL FUEL GAS CODE<^ 



105 



CHIMNEYS AND VENTS 



TABLE 504.3(1) 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER— (D) inches 


3 


4 


5 


6 


. ._ 7... 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


MIn 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


22 


37 


26 


35 


66 


46 


46 


106 


72 


58 


164 


104 


77 


225 


142 


92 


296 


185 


109 


376 


237 


128 


466 


289 


2 


23 


41 


31 


37 


75 


55 


48 


121 


86 


60 


183 


124 


79 


253 


168 


95 


333 


220 


112 


424 


282 


131 


526 


345 


3 


24 


44 


35 


38 


81 


62 


49 


132 


96 


62 


199 


139 


82 


275 


189 


97 


363 


248 


114 


463 


317 


134 


575 


386 


8 


1 


22 


40 


27 


35 


72 


48 


49 


114 


76 


64 


176 


109 


84 


243 


148 


100 


320 


194 


118 


408 


248 


138 


507 


303 


2 ■ 


23 


44 


32 


36 


80 


57 


51 


128 


90 


66 


195 


129 


86 


269 


175 


103 


356 


230 


121 


454 


294 


141 


564 


358 


3 


24 


47 


36 


37 


87 


64 


53 


139 


101 


67 


210 


145 


88 


290 


198 


105 


384 


258 


123 


492 


330 


143 


612 


402 


10 


1 


22 


43 


28 


34 


78 


50 


49 


123 


78 


65 


189 


113 


89 


257 


154 


106 


341 


200 


125 


436 


257 


146 


542 


314 


2 


23 


47 


33 


36 


86 


59 


51 


136 


93 


67 


206 


134 


91 


282 


182 


109 


374 


238 


128 


479 


305 


149 


596 


372 


3 


24 


50 


37 


37 


92 


67 


52 


146 


104 


69 


220 


150 


94 


303 


205 


111 


402 


268 


131 


515 


342 


152 


642 


417 


15 


1 


21 


50 


30 


33 


89 


53 


47 


142 


83 


64 


220 


120 


88 


298 


163 


110 


389 


214 


134 


493 


273 


162 


609 


333 


2 


22 


53 


35 


35 


96 


63 


49 


153 


99 


66 


235 


142 


91 


320 


193 


112 


419 


253 


137 


532 


323 


165 


658 


394 


3 


24 


55 


40 


36 


102 


71 


51 


163 


111 


68 


248 


160 


93 


339 


218 


115 


445 


286 


140 


565 


365 


167 


700 


444 


20 


1 


21 


54 


31 


33 


99 


56 


46 


157 


87 


62 


246 


125 


86 


334 


171 


107 


436 


224 


131 


552 


285 


158 


681 


347 


2 


22 


57 


37 


34 


105 


66 


48 


167 


104 


64 


259 


149 


89 


354 


202 


110 


463 


265 


134 


587 


339 


161 


725 


414 


3 


23 


60 


42 


35 


110 


74 


50 


176 


116 


66 


271 


168 


91 


371 


228 


113 


486 


300 


137 


618 


383 


164 


764 


466 


30 


1 


20 


62 


33 


31 


113 


59 


45 


181 


93 


60 


288 


134 


83 


391 


182 


103 


512 


238 


125 


649 


305 


151 


802 


372 


2 


21 


64 


39 


33 


118 


70 


47 


190 


110 


62 


299 


158 


85 


408 


215 


105 


535 


282 


129 


679 


360 


155 


840 


439 


3 


22 


66 


44 


34 


123 


79 


48 


198 


124 


64 


309 


178 


88 


423 


242 


108 


555 


317 


132 


706 


405 


158 


874 


494 


50 


1 


19 


71 


36 


30 


133 


64 


43 


216 


101 


57 


349 


145 


78 


477 


197 


97 


627 


257 


120 


797 


330 


144 


984 


403 


2 


21 


73 


43 


32 


137 


76 


45 


223 


119 


59 


358 


172 


81 


490 


234 


100 


645 


306 


123 


820 


392 


148 


1,014 


478 


3 


22 


75 


48 


33 


141 


86 


46 


229 


134 


61 


366 


194 


83 


502 


263 


103 


661 


343 


126 


842 


441 


151 


1,043 


538 


100 


1 


18 


82 


37 


28 


158 


66 


40 


262 


104 


53 


442 


150 


73 


611 


204 


91 


810 


266 


112 


1,038 


341 


135 


1,285 


417 


2 


19 


83 


44 


30 


161 


79 


42 


267 


123 


55 


447 


178 


75 


619 


242 


94 


822 


316 


115 


1,054 


405 


139 


1,306 


494 


3 


20 


84 


50 


31 


163 


89 


44 


272 


138 


57 


452 


109 


78 


627 


272 


97 


834 


355 


118 


1,069 


455 


142 


1,327 


555 



COMMON VENT CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER (Z^inches 


4 


5 


6 


7 


8 


9 


10 1 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


92 


81 


65 


140 


116 


103 


204 


161 


147 


309 


248 


200 


404 


314 


260 


547 


434 


335 


672 


520 


410 


8 


101 


90 


73 


155 


129 


114 


224 


178 


163 


339 


275 


223 


444 


348 


290 


602 


480 


378 


740 


577 


465 


10 


110 


97 


79 


169 


141 


124 


243 


194 


178 


367 


299 


242 


477 


377 


315 


649 


522 


405 


800 


627 


495 


15 


125 


112 


91 


195 


164 


144 


283 


228 


206 


427 


352 


280 


556 


444 


365 


753 


612 


465 


924 


733 


565 


20 


136 


123 


102 


215 


183 


160 


314 


255 


229 


475 


394 


310 


621 


499 


405 


842 


688 


523 


1,035 


826 


640 


30 


152 


138 


118 


244 


210 


185 


361 


297 


266 


547 


459 


360 


720 


585 


470 


979 


808 


605 


1,209 


975 


740 


50 


167 


153 


134 


279 


244 


214 


421 


353 


310 


641 


547 


423 


854 


706 


550 


1,164 


977 


705 


1,451 


1,188 


860 


100 


175 


163 


NA 


311 


277 


NA 


489 


421 


NA 


751 


658 


479 


1,025 


873 


625 


1,408 


1,215 


800 


1,784 


1,502 


975 



(continued) 



106 



2006 INTERNATIONAL FUEL GAS CODE*' 



CHIMNEYS AND VENTS 



TABLE 504.3(1)— continued 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 
RISE 

(fl) 
(feet) 


TYPE B DOUBLE-WALL VENT AND DIAMETER— (D) inches 


12 


14 


16 


18 


20 


22 


24 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


2 


174 


764 


496 


223 


1,046 


653 


281 


1,371 


853 


346 


1,772 


1,080 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


180 


897 


616 


230 


1,231 


827 


287 


1,617 


1,081 


352 


2,069 


1,370 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


2 


186 


822 


516 


238 


1,126 


696 


298 


1,478 


910 


365 


1,920 


1,150 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


192 


952 


644 


244 


1,307 


884 


305 


1,719 


1,150 


372 


2,211 


1,460 


471 


2,737 


1,800 


560 


3,319 


2,180 


662 


3,957 


2,590 


6 


198 


1,050 


772 


252 


1,445 


1,072 


313 


1,902 


1,390 


380 


2,434 


1,770 


478 


3,018 


2,180 


568 


3,665 


2,640 


669 


4,373 


3,130 


10 


2 


196 


870 


536 


249 


1,195 


730 


311 


1,570 


955 


379 


2,049 


1,205 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


201 


997 


664 


256 


1,371 


924 


318 


1,804 


1,205 


387 


2,332 


1,535 


486 


2,887 


1,890 


581 


3,502 


2,280 


686 


4,175 


2,710 


6 


207 


1,095 


792 


263 


1,509 


1,118 


325 


1,989 


1,455 


395 


2,556 


1,865 


494 


3,169 


2,290 


589 


3,849 


2,760 


694 


4,593 


3,270 


15 


2 


214 


967 


568 


272 


1,334 


790 


336 


1,760 


1,030 


408 


2,317 


1,305 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


221 


1,085 


712 


279 


1,499 


1,006 


344 


1,978 


1,320 


416 


2,579 


1,665 


523 


3,197 


2,060 


624 


3,881 


2,490 


734 


4,631 


2,960 


6 


228 


1,181 


856 


286 


1,632 


1,222 


351 


2,157 


1,610 


424 


2,796 


2,025 


533 


3,470 


2,510 


634 


4,216 


3,030 


743 


5,035 


3,600 


20 


2 


223 


1,051 


596 


291 


1,443 


840 


357 


1,911 


1,095 


430 


2,533 


1,385 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


230 


1,162 


748 


298 


1,597 


1,064 


365 


2,116 


1,395 


438 


2,778 


1,765 


554 


3,447 


2,180 


661 


4,190 


2,630 


772 


5,005 


3,130 


6 


237 


1,253 


900 


307 


1,726 


1,288 


373 


2,287 


1,695 


450 


2,984 


2,145 


567 


3,708 


2,650 


671 


4,511 


3,190 


785 


5,392 


3,790 


30 


2 


216 


1,217 


632 


286 


1,664 


910 


367 


2,183 


1,190 


461 


2,891 


1,540 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


223 


1,316 


792 


294 


1,802 


1,160 


376 


2,366 


1,510 


474 


3,110 


1,920 


619 


3,840 


2,365 


728 


4,861 


2,860 


847 


5,606 


3,410 


6 


231 


1,400 


952 


303 


1,920 


1,410 


384 


2,524 


1,830 


485 


3,299 


2,340 


632 


4,080 


2,875 


741 


4,976 


3,480 


860 


5,961 


4,150 


50 


2 


206 


1,479 


689 


273 


2,023 


1,007 


350 


2,659 


1,315 


435 


3,548 


1,665 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


213 


1,561 


860 


281 


2,139 


1,291 


359 


2,814 


1,685 


447 


3,730 


2,135 


580 


4,601 


2,633 


709 


5,569 


3,185 


851 


6,633 


3,790 


6 


221 


1,631 


1,031 


290 


2,242 


1,575 


369 


2,951 


2,055 


461 


3,893 


2,605 


594 


4,808 


3,208 


724 


5,826 


3,885 


867 


6,943 


4,620 


100 


2 


192 


1,923 


712 


254 


2,644 


1,050 


326 


3,490 


1,370 


402 


4,707 


1,740 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4 


200 


1,984 


888 


263 


2,731 


1,346 


336 


3,606 


1,760 


414 


4,842 


2,220 


523 


5,982 


2,750 


639 


7,254 


3,330 


769 


8,650 


3,950 


6 


208 


2,035 


1,064 


272 


2,811 


1,642 


346 


3,714 


2,150 


426 


4,968 


2,700 


539 


6,143 


3,350 


654 


7,453 


4,070 


786 


8,892 


4,810 



COMIMON VENT CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER— <D) inches 


12 


14 


16 


18 


20 


22 


24 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
-t-FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
■i-FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


900 


696 


588 


1,284 


990 


815 


1,735 


1,336 


1,065 


2,253 


1,732 


1,345 


2,838 


2,180 


1,660 


3,488 


2,677 


1970 


4,206 


3,226 


2,390 


8 


994 


773 


652 


1,423 


1,103 


912 


1,927 


1,491 


1,190 


2,507 


1,936 


1,510 


3,162 


2,439 


1,860 


3,890 


2,998 


2,200 


4,695 


3,616 


2,680 


10 


1,076 


841 


712 


1,542 


1,200 


995 


2,093 


1,625 


1,300 


2,727 


2,113 


1645 


3,444 


2,665 


2,030 


4,241 


3,278 


2,400 


5,123 


3,957 


2,920 


15 


1,247 


986 


825 


1,794 


1,410 


1,158 


2,440 


1,910 


1,510 


3,184 


2,484 


1,910 


4,026 


3,133 


2,360 


4,971 


3,862 


2,790 


6,016 


4,670 


3,400 


20 


1,405 


1,116 


916 


2,006 


1,588 


1,290 


2,722 


2,147 


1,690 


3,561 


2,798 


2,140 


4,548 


3,552 


2,640 


5,573 


4,352 


3,120 


6,749 


5,261 


3,800 


30 


1,658 


1,327 


1,025 


2,373 


1,892 


1,525 


3,220 


2,558 


1,990 


4,197 


3,326 


2,520 


5,303 


4,193 


3,110 


6,539 


5,157 


3,680 


7,940 


6,247 


4,480 


50 


2,024 


1,640 


1,280 


2,911 


2,347 


1,863 


3,964 


3,183 


2,430 


5,184 


4,149 


3,075 


6,567 


5,240 


3,800 


8,116 


6,458 


4,500 


9,837 


7,813 


5,475 


100 


2,569 


2,131 


1,670 


3,732 


3,076 


2,450 


5,125 


4,202 


3,200 


6,749 


5,509 


4,050 


8,597 


6,986 


5,000 


10,681 


8,648 


5,920 


13,004 


10,499 


7,200 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



2006 INTERNATIONAL FUEL GAS CODE^ 



107 



CHIMNEYS AND VENTS 



TABLE 504.3(2) 
TYPE B DOUBLE-WALL VENT 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Single-wall metal connector 



VENT CONNECTOR CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


CONNECTOR 
RISE 

(fl) 
(feet) 


SINGLE-WALL METAL VENT CONNECTOR DIAMETER— (D) inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


NA 


NA 


26 


NA 


NA 


46 


NA 


NA 


71 


NA 


NA 


102 


207 


223 


140 


262 


293 


183 


325 


373 


234 


447 


463 


286 


2 


NA 


NA 


31 


NA 


NA 


55 


NA 


NA 


85 


168 


182 


123 


215 


251 


167 


271 


331 


219 


334 


422 


281 


458 


524 


344 


3 


NA 


NA 


34 


NA 


NA 


62 


121 


131 


95 


175 


198 


138 


222 


273 


188 


279 


361 


247 


344 


462 


316 


468 


574 


385 


8 


1 


NA 


NA 


27 


NA 


NA 


48 


NA 


NA 


75 


NA 


NA 


106 


226 


240 


145 


285 


316 


191 


352 


403 


244 


481 


502 


299 


2 


NA 


NA 


32 


NA 


NA 


57 


125 


126 


89 


184 


193 


127 


234 


266 


173 


293 


353 


228 


360 


450 


292 


492 


560 


355 


3 


NA 


NA 


35 


NA 


NA 


64 


130 


138 


100 


191 


208 


144 


241 


287 


197 


302 


381 


256 


370 


489 


328 


501 


609 


400 


10 


1 


NA 


NA 


28 


NA 


NA 


50 


119 


121 


77 


182 


186 


110 


240 


253 


150 


302 


335 


196 


372 


429 


252 


506 


534 


308 


2 


NA 


NA 


33 


84 


85 


59 


124 


134 


91 


189 


203 


132 


248 


278 


183 


311 


369 


235 


381 


473 


302 


517 


589 


368 


3 


NA 


NA 


36 


89 


91 


67 


129 


144 


102 


197 


217 


148 


257 


299 


203 


320 


398 


265 


391 


511 


339 


528 


637 


413 


15 


1 


NA 


NA 


29 


79 


87 


52 


116 


138 


81 


177 


214 


116 


238 


291 


158 


312 


380 


208 


397 


482 


266 


556 


596 


324 


2 


NA 


NA 


34 


83 


94 


62 


121 


150 


97 


185 


230 


138 


246 


314 


189 


321 


411 


248 


407 


522 


317 


568 


646 


387 


3 


NA 


NA 


39 


87 


100 


70 


127 


160 


109 


193 


243 


157 


255 


333 


215 


331 


438 


281 


418 


557 


360 


579 


690 


437 


20 


1 


49 


56 


30 


78 


97 


54 


115 


152 


84 


175 


238 


120 


233 


325 


165 


306 


425 


217 


390 


538 


276 


546 


664 


336 


2 


52 


59 


36 


82 


103 


64 


120 


163 


101 


182 


252 


144 


243 


346 


197 


317 


453 


259 


400 


574 


331 


558 


709 


403 


3 


55 


62 


40 


87 


107 


72 


125 


172 


113 


190 


264 


164 


252 


363 


223 


326 


476 


294 


412 


607 


375 


570 


750 


457 


30 


1 


47 


60 


31 


77 


110 


57 


112 


175 


89 


169 


278 


129 


226 


380 


175 


296 


497 


230 


378 


630 


294 


528 


779 


358 


2 


51 


62 


37 


81 


115 


67 


117 


185 


106 


177 


290 


152 


236 


397 


208 


307 


521 


274 


389 


662 


349 


541 


819 


425 


3 


54 


64 


42 


85 


119 


76 


122 


193 


120 


185 


300 


172 


244 


412 


235 


316 


542 


309 


400 


690 


394 


555 


855 


482 


50 


1 


46 


69 


34 


75 


128 


60 


109 


207 


96 


162 


336 


137 


217 


460 


188 


284 


604 


245 


364 


768 


314 


507 


951 


384 


2 


49 


71 


40 


79 


132 


72 


114 


215 


113 


170 


345 


164 


226 


473 


223 


294 


623 


293 


376 


793 


375 


520 


983 


458 


3 


52 


72 


45 


83 


136 


82 


119 


221 


123 


178 


353 


186 


235 


486 


252 


304 


640 


331 


387 


816 


423 


535 


1,013 


518 


100 


1 


45 


79 


34 


71 


150 


61 


104 


249 


98 


153 


424 


140 


205 


585 


192 


269 


774 


249 


345 


993 


321 


476 


1,236 


393 


2 


48 


80 


41 


75 


153 


73 


110 


255 


115 


160 


428 


167 


212 


593 


228 


279 


788 


299 


358 


1,011 


383 


490 


1,259 


469 


3 


51 


81 


46 


79 


157 


85 


114 


260 


129 


168 


433 


190 


222 


603 


256 


289 


801 


339 


368 


1,027 


431 


506 


1,280 


527 



COMMON VENT CAPACITY 



VENT 

HEIGHT 

(H) 

(feet) 


TYPE B DOUBLE-WALL COMMON VENT DIAMETER— (D) inches 


4 


5 


6 


7 


8 


9 


10 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


78 


64 


NA 


113 


99 


200 


158 


144 


304 


244 


196 


398 


310 


257 


541 


429 


332 


665 


515 


407 


8 


NA 


87 


71 


NA 


126 


111 


218 


173 


159 


331 


269 


218 


436 


342 


285 


592 


473 


373 


730 


569 


460 


10 


NA 


94 


76 


163 


137 


120 


237 


189 


174 


357 


292 


236 


467 


369 


309 


638 


512 


398 


787 


617 


487 


15 


121 


108 


88 


189 


159 


140 


275 


221 


200 


416 


343 


274 


544 


434 


357 


738 


599 


456 


905 


718 


553 


20 


131 


118 


98 


208 


177 


156 


305 


247 


223 


463 


383 


302 


606 


487 


395 


824 


673 


512 


1,013 


808 


626 


30 


145 


132 


113 


236 


202 


180 


350 


286 


257 


533 


446 


349 


703 


570 


459 


958 


790 


593 


1,183 


952 


723 


50 


159 


145 


128 


268 


233 


208 


406 


337 


296 


622 


529 


410 


833 


686 


535 


1,139 


954 


689 


1,418 


1,157 


838 


100 


166 


153 


NA 


297 


263 


NA 


469 


398 


NA 


726 


633 


464 


999 


846 


606 


1,378 


1,185 


780 


1,741 


1,459 


948 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W 



108 



2006 INTERNATIONAL FUEL GAS CODE*" 



CHIMNEYS AND VENTS 



TABLE 504.3(3) 
MASONRY CHIMNEY 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Type B double-wall connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 

RISE 

(H) 

(feet) 


TYPE B DOUBLE-WALL VENT CONNECTOR DIAMETER— (D) Inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


24 


33 


21 


39 


62 


40 


52 


106 


67 


65 


194 


101 


87 


274 


141 


104 


370 


201 


124 


479 


253 


145 


599 


319 


2 


26 


43 


28 


41 


79 


52 


53 


133 


85 


67 


230 


124 


89 


324 


173 


107 


436 


232 


127 


562 


300 


148 


694 


378 


3 


27 


49 


34 


42 


92 


61 


55 


155 


97 


69 


262 


143 


91 


369 


203 


109 


491 


270 


129 


633 


349 


151 


795 


439 


8 


1 


24 


39 


22 


39 


72 


41 


55 


117 


69 


71 


213 


105 


94 


304 


148 


113 


414 


210 


134 


539 


267 


156 


682 


335 


2 


26 


47 


29 


40 


87 


53 


57 


140 


86 


73 


246 


127 


97 


350 


179 


116 


473 


240 


137 


615 


311 


160 


776 


394 


3 


27 


52 


34 


42 


97 


62 


59 


159 


98 


75 


269 


145 


99 


383 


206 


119 


517 


276 


139 


672 


358 


163 


848 


452 


10 


1 


24 


42 


22 


38 


80 


42 


55 


130 


71 


74 


232 


108 


101 


324 


153 


120 


444 


216 


142 


582 


277 


165 


739 


348 


2 


26 


50 


29 


40 


93 


54 


57 


153 


87 


76 


261 


129 


103 


366 


184 


123 


498 


247 


145 


652 


321 


168 


825 


407 


3 


27 


55 


35 


41 


105 


63 


58 


170 


100 


78 


284 


148 


106 


397 


209 


126 


540 


281 


147 


705 


366 


171 


893 


463 


15 


1 


24 


48 


23 


38 


93 


44 


54 


154 


74 


72 


277 


114 


100 


384 


164 


125 


511 


229 


153 


658 


297 


184 


824 


375 


2 


25 


55 


31 


39 


105 


55 


56 


174 


89 


74 


299 


134 


103 


419 


192 


128 


558 


260 


156 


718 


339 


187 


900 


432 


3 


26 


59 


35 


41 


115 


64 


57 


189 


102 


76 


319 


153 


105 


448 


215 


131 


597 


292 


159 


760 


382 


190 


960 


486 


20 


1 


24 


52 


24 


37 


102 


46 


53 


172 


77 


71 


313 


119 


98 


437 


173 


123 


584 


239 


150 


752 


312 


180 


943 


397 


2 


25 


58 


31 


39 


114 


56 


55 


190 


91 


73 


335 


138 


101 


467 


199 


126 


625 


270 


153 


805 


354 


184 


1,011 


452 


3 


26 


63 


35 


40 


123 


65 


57 


204 


104 


75 


353 


157 


104 


493 


222 


129 


661 


301 


156 


851 


396 


187 


1,067 


505 


30 


1 


24 


54 


25 


37 


111 


48 


52 


192 


82 


69 


357 


127 


96 


504 


187 


119 


680 


255 


145 


883 


337 


175 


1,115 


432 


2 


25 


60 


32 


38 


122 


58 


54 


208 


95 


72 


376 


145 


99 


531 


209 


122 


715 


287 


149 


928 


378 


179 


1,171 


484 


3 


26 


64 


36 


40 


131 


66 


56 


221 


107 


74 


392 


163 


101 


554 


233 


125 


746 


317 


152 


968 


418 


182 


1,220 


535 


50 


1 


23 


51 


25 


36 


116 


51 


51 


209 


89 


67 


405 


143 


92 


582 


213 


115 


798 


294 


140 


1,049 


392 


168 


1,334 


506 


2 


24 


59 


32 


37 


127 


61 


53 


225 


102 


70 


421 


161 


95 


604 


235 


118 


827 


326 


143 


1,085 


433 


172 


1,379 


558 


3 


26 


64 


36 


39 


135 


69 


55 


237 


115 


72 


435 


80 


98 


624 


260 


121 


854 


357 


147 


1,118 


474 


176 


1,421 


611 


100 


1 


23 


46 


24 


35 


108 


50 


49 


208 


92 


65 


428 


155 


88 


640 


237 


109 


907 


334 


134 


1,222 


454 


161 


1,589 


596 


2 


24 


53 


31 


37 


120 


60 


51 


224 


105 


67 


444 


174 


92 


660 


260 


113 


933 


368 


138 


1,253 


497 


165 


1,626 


651 


3 


25 


59 


35 


38 


130 


68 


53 


237 


118 


69 


458 


193 


94 


679 


285 


116 


956 


399 


141 


1,282 


540 


169 


1,661 


705 



COIMMON VENT CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


74 


25 


NA 


119 


46 


NA 


178 


71 


NA 


257 


103 


NA 


351 


143 


NA 


458 


188 


NA 


582 


246 


1,041 


853 


NA 


8 


NA 


80 


28 


NA 


130 


53 


NA 


193 


82 


NA 


279 


119 


NA 


384 


163 


NA 


501 


218 


724 


636 


278 


1,144 


937 


408 


10 


NA 


84 


31 


NA 


138 


56 


NA 


207 


90 


NA 


299 


131 


NA 


409 


177 


606 


538 


236 


776 


686 


302 


1,226 


1,010 


454 


15 


NA 


NA 


36 


NA 


152 


67 


NA 


233 


106 


NA 


334 


152 


523 


467 


212 


682 


611 


283 


874 


781 


365 


1,374 


1,156 


546 


20 


NA 


NA 


41 


NA 


NA 


75 


NA 


250 


122 


NA 


368 


172 


565 


508 


243 


742 


668 


325 


955 


858 


419 


1,513 


1,286 


648 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


270 


137 


NA 


404 


198 


615 


564 


278 


816 


747 


381 


1,062 


969 


496 


1,702 


1,473 


749 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


620 


328 


879 


831 


461 


1,165 


1,089 


606 


1,905 


1,692 


922 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


348 


NA 


NA 


499 


NA 


NA 


669 


2,053 


1,921 


1,058 



For SI: 1 inch = 25.4 mm, 1 square inch - 645.16 nmf , 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



2006 INTERNATIONAL FUEL GAS CODE'^ 



109 



CHIMNEYS AND VENTS 



TABLE 504.3(4) 
MASONRY CHIMNEY 



Number of Appliances 


Two or more 


Appliance Type 


Category I 


Appliance Vent Connection 


Single- wall metal connector 



VENT CONNECTOR CAPACITY 



VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


SINGLE-WALL METAL VENT CONNECTOR DIAMETER (Z7)— inches 


3 


4 


5 


6 


7 


8 


9 


10 


APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


Min 


Max 


Max 


6 


1 


NA 


NA 


21 


NA . 


NA 


39 


NA 


NA 


66 


179 


191 


100 


231 


271 


140 


292 


366 


200 


362 


474 


252 


499 


594 


316 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


84 


186 


227 


123 


239 


321 


172 


301 


432 


231 


373 


557 


299 


509 


696 


376 


3 


NA 


NA 


.34 


NA 


NA 


61 


134 


153 


97 


193 


258 


142 


247 


365 


202 


309 


491 


269 


381 


634 


348 


519 


793 


437 


8 


1 


NA 


NA 


21 


NA 


NA 


40 


NA 


NA 


68 


195 


208 


103 


250 


298 


146 


313 


407 


207 


387 


530 


263 


529 


672 


331 


2 


NA 


NA 


28 


NA 


NA 


52 


137 


139 


85 


202 


240 


125 


258 


343 


177 


323 


465 


238 


397 


607 


309 


540 


766 


391 


3 


NA 


NA 


34 


NA 


NA 


62 


143 


156 


98 


210 


264 


145 


266 


376 


205 


332 


509 


274 


407 


663 


356 


551 


838 


450 


10 


1 


NA 


NA 


22 


NA 


NA 


41 


130 


151 


70 


202 


225 


106 


267 


316 


151 


333 


434 


213 


410 


571 


273 


558 


727 


343 


2 


NA 


NA 


29 


NA 


NA 


53 


136 


150 


86 


210 


255 


128 


276 


358 


181 


343 


489 


244 


420 


640 


317 


569 


813 


403 


3 


NA 


NA 


34 


97 


102 


62 


143 


166 


99 


217 


277 


147 


284 


389 


207 


352 


530 


279 


430 


694 


363 


580 


880 


459 


15 


1 


NA 


NA 


23 


NA 


NA 


43 


129 


151 


73 


199 


271 


112 


268 


376 


161 


349 


502 


225 


445 


646 


291 


623 


808 


366 


2 


NA 


NA 


30 


92 


103 


54 


135 


170 


88 


207 


295 


132 


277 


411 


189 


359 


548 


256 


456 


706 


334 


634 


884 


424 


3 


NA 


NA 


34 


96 


112 


63 


141 


185 


101 


215 


315 


151 


286 


439 


213 


368 


586 


289 


466 


755 


378 


646 


945 


479 


20 


1 


NA 


NA 


23 


87 


99 


45 


128 


167 


76 


197 


303 


117 


265 


425 


169 


345 


569 


235 


439 


734 


306 


614 


921 


347 


2 


NA 


NA 


30 


91 


111 


55 


134 


185 


90 


205 


325 


136 


274 


455 


195 


355 


610 


266 


450 


787 


348 


627 


986 


443 


3 


NA 


NA 


35 


96 


119 


64 


140 


199 


103 


213 


343 


154 


282 


481 


219 


365 


644 


298 


461 


831 


391 


639 


1,042 


496 


30 


1 


NA 


NA 


24 


86 


108 


47 


126 


187 


80 


193 


347 


124 


259 


492 


183 


338 


665 


250 


430 


864 


330 


600 


1,089 


421 


2 


NA 


NA 


31 


91 


119 


57 


132 


203 


93 


201 


366 


142 


269 


518 


205 


348 


699 


282 


442 


908 


372 


613 


1,145 


473 


3 


NA 


NA 


35 


95 


127 


65 


138 


216 


105 


209 


381 


160 


277 


540 


229 


358 


729 


312 


452 


946 


412 


626 


1,193 


524 


50 


1 


NA 


NA 


24 


85 


113 


50 


124 


204 


87 


188 


392 


139 


252 


567 


208 


328 


778 


287 


417 


1,022 


383 


582 


1,302 


492 


2 


NA 


NA 


31 


89 


123 


60 


130 


218 


100 


196 


408 


158 


262 


588 


230 


339 


806 


320 


429 


1,058 


425 


596 


1,346 


545 


3 


NA 


NA 


35 


94 


131 


68 


136 


231 


112 


205 


422 


176 


271 


607 


255 


349 


831 


351 


440 


1,090 


466 


610 


1,386 


597 


100 


1 


NA 


NA 


23 


84 


104 


49 


122 


200 


89 


182 


410 


151 


243 


617 


232 


315 


875 


328 


402 


1,181 


444 


560 


1,537 


580 


2 


NA 


NA 


30 


88 


115 


59 


127 


215 


102 


190 


425 


169 


253 


636 


254 


326 


899 


361 


415 


1,210 


488 


575 


1,570 


634 


3 


NA 


NA 


34 


93 


124 


67 


133 


228 


115 


199 


438 


188 


262 


654 


279 


337 


921 


392 


427 


1,238 


529 


589 


1,604 


687 



COIMIMON VENT CAPACITY 



VENT 
HEIGHT 

(W) 
(feet) 


MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


FAN 
+FAN 


FAN 
+NAT 


NAT 
+NAT 


6 


NA 


NA 


25 


NA 


118 


45 


NA 


176 


71 


NA 


255 


102 


NA 


348 


142 


NA 


455 


187 


NA 


579 


245 


NA 


846 


NA 


8 


NA 


NA 


28 


NA 


128 


52 


NA 


190 


81 


NA 


276 


118 


NA 


380 


162 


NA 


497 


217 


NA 


633 


277 


1,136 


928 


405 


10 


NA 


NA 


31 


NA 


136 


56 


NA 


205 


89 


NA 


295 


129 


NA 


405 


175 


NA 


532 


234 


171 


680 


300 


1,216 


1,000 


450 


15 


NA 


NA 


36 


NA 


NA 


66 


NA 


230 


105 


NA 


335 


150 


NA 


400 


210 


677 


602 


280 


866 


772 


360 


1,359 


1,139 


540 


20 


NA 


NA 


NA 


NA 


NA 


74 


NA 


247 


120 


NA 


362 


170 


NA 


503 


240 


765 


661 


321 


947 


849 


415 


1,495 


1,264 


640 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


135 


NA 


398 


195 


NA 


558 


275 


808 


739 


377 


1,052 


957 


490 


1,682 


1,447 


740 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


612 


325 


NA 


821 


456 


1,152 


1,076 


600 


1,879 


1,672 


910 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


494 


NA 


NA 


663 


2,006 


1,885 


1,046 



For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mnf , 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



110 



2006 INTERNATIONAL FUEL GAS CODE® 



CHIMNEYS AND VENTS 



TABLE 504.3(5) 
SINGLE-WALL METAL PIPE OR TYPE ASBESTOS CEMENT VENT 



Number of Appliances 


Two or more 


Appliance Type 


Draft hood-equipped 


Appliance Vent Connection 


Direct to pipe or vent 



VENT CONNECTOR CAPACITY 



TOTAL VENT 
HEIGHT 

(H) 
(feet) 


CONNECTOR 

RISE 

(fl) 

(feet) 


VENT CONNECTOR DIAMETER— (^ inches 


3 


4 


5 


6 


7 


8 


IVIAXIMUM APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6-8 


1 


21 


40 


68 


102 


146 


205 


2 


28 


53 


86 


124 


178 


235 


3 


34 


61 


98 


147 


204 


275 


15 


1 


23 


44 


77 


117 


179 


240 


2 


30 


56 


92 


134 


194 


265 


3 


35 


64 


102 


155 


216 


298 


30 and up 


1 


25 


49 


84 


129 


190 


270 


2 


31 


58 


97 


145 


211 


295 


3 


36 


68 


107 


164 


232 


321 



COMIMON VENT CAPACITY 



TOTAL VENT 
HEIGHT 

(H) 
(feet) 


COMMON VENT DIAMETER— (D; mches 


4 


5 


6 


7 


8 


10 


12 


COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H 


6 


48 


78 


111 


155 


205 


320 


NA 


8 


55 


89 


128 


175 


234 


365 


505 


10 


59 


95 


136 


190 


250 


395 


560 


15 


71 


115 


168 


228 


305 


480 


690 


20 


80 


129 


186 


260 


340 


550 


790 


30 


NA 


147 


215 


300 


400 


650 


940 


50 


NA 


NA 


NA 


360 


490 


810 


1,190 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



2006 INTERNATIONAL FUEL GAS CODE*" 



111 



CHIMNEYS AND VENTS 



TABLE 504.3(6a) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


NAT + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



Combined Appliance Maximum 
Input Rating in Thousands of Btu per Hour 



VENT 
HEIGHT 


INTERNAL AREA OF CHIIVINEY (square inches) 


















(feet) 


12 


19 


28 


38 


50 


63 


78 


113 


6 


25 


46 


71 


103 


143 


188 


246 


NA 


8 


28 


53 


82 


119 


163 


218 


278 


408 


10 


31 


56 


90 


131 


177 


236 


302 


454 


15 


NA 


67 


106 


152 


212 


283 


365 


546 


20 


NA 


NA 


NA 


NA 


NA 


325 


419 


648 


30 


NA 


NA 


NA 


NA 


NA 


NA 


496 


749 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


922 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 



TABLE 504.3(6b) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


NAT + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



Minimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 
HEIGHT 




INTERNAL AREA OF CHIMNEY (square 


inches) 




















(feet) 


12 


19 


28 


38 


50 


63 


78 


113 


37°F or 


















Greater 


Lo( 


:al 99% 


Winter D 


esign T( 


imperat 


jre: 37''F 


or Gres 


ter 


6 























NA 


8 


























10 


























15 


NA 























20 


NA 


NA 


NA 


NA 


NA 


184 








30 


NA 


NA 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


27 to 


















se-F 




-ocal 99 


% Winte 


r Desigr 


Tempe 


rature: 2 


7 to 36°F 




6 








68 


NA 


NA 


180 


212 


NA 


8 








82 


NA 


NA 


187 


214 


263 


10 





51 


NA 


NA 


NA 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


NA 


253 


274 


305 


20 


NA 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


NA 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


763 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 



TABLE 504.3(6b) 
EXTERIOR MASONRY CHIMNEY— continued 



Minimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 
HEIGHT 




INTERNAL AREA OF CHIMNEY (square 


inches) 




















(feet) 


12 


19 


28 


38 


50 


63 


78 


113 


17 to 










26°F 




Local 99% Winter Design Temperature: 17 to 26''F 


6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA 


NA 


264 


352 


10 


NA 


NA 


NA 


NA 


NA 


NA 


278 


358 


15 


NA 


NA 


NA 


NA 


NA 


NA 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


NA 


387 


457 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


581 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


862 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


5 to 










16°F 




Local 99% Winter Design Temperature: 5 to 16°F 




6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


430 


15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


4''For 










Lower 


Local 99% Winter Design Temperature: 4°F or Lower 


Not recommended for any vent configurations 



Note: See Figure B-19 in Appendix B for a map showing local 99 percent 

winter design temperatures in the United States. 
For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 1 square inch = 645.16 mirf, 
1 foot - 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



112 



2006 INTERNATIONAL FUEL GAS CODE*^ 



CHIMNEYS AND VENTS 



TABLE 504.3(7a) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


FAN + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



Combined Appliance lUlaximum 
Input Rating in Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 


INTERNAL AREA OF CHIMNEY (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


6 


74 


119 


178 


257 


351 


458 


582 


853 


8 


80 


130 


193 


279 


384 


501 


636 


937 


10 


84 


138 


207 


299 


409 


538 


686 


1,010 


15 


NA 


152 


233 


334 


467 


611 


781 


1,156 


20 


NA 


NA 


250 


368 


508 


668 


858 


1,286 


30 


NA 


NA 


NA 


404 


564 


747 


969 


1,473 


50 


NA 


NA 


NA 


NA 


NA 


831 


1,089 


1,692 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,921 



TABLE 504.3(7b) 
EXTERIOR MASONRY CHIMNEY 



Number of 
Appliances 


Two or more 


Appliance 
Type 


FAN + NAT 


Appliance Vent 
Connection 


TypeB 

double-wall 

connector 



IVIinimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 




INTERNAL AREA OF CHIIVINEY 


(square inches) 




12 


19 


28 


38 


50 


63 


78 


113 


37^ or 
Greater 


Lo( 


:al 99% 


Winter D 


esign T« 


imperati 


jre: 37°F 


or Gres 


ter 


6 


























8 


























10 


























15 


NA 























20 


NA 


NA 


123 


190 


249 


184 








30 


NA 


NA 


NA 


334 


398 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


714 


707 


579 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,600 


27 to 
36°F 




Local 99 


% Winte 


r Desigr 


Tempe 


•ature: 2 


7 to 36°F 




6 








68 


116 


156 


180 


212 


266 


8 








82 


127 


167 


187 


214 


263 


10 





51 


97 


141 


183 


210 


225 


265 


15 


NA 


111 


142 


183 


233 


253 


274 


305 


20 


NA 


NA 


187 


230 


284 


307 


330 


362 


30 


NA 


NA 


NA 


330 


319 


419 


445 


485 


50 


NA 


NA 


NA 


NA 


NA 


672 


705 


763 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,554 



TABLE 504.3(7b) 
EXTERIOR MASONRY CHIMNEY— continued 



lUlinimum Allowable Input Rating of 
Space-Heating Appliance in Thousands of Btu per Hour 



VENT 

HEIGHT 

(feet) 


INTERNAL AREA OF CHIMNEY (square inches) 


12 


19 


28 


38 


50 


63 


78 


113 


17 to 
26"F 




Local 99% Winter Design Temperature: 17 to 26°F 


6 





55 


99 


141 


182 


215 


259 


349 


8 


52 


74 


111 


154 


197 


226 


264 


352 


10 


NA 


90 


125 


169 


214 


245 


278 


358 


15 


NA 


NA 


167 


212 


263 


296 


331 


398 


20 


NA 


NA 


212 


258 


316 


352 


387 


457 


30 


NA 


NA 


NA 


362 


429 


470 


507 


581 


50 


NA 


NA 


NA 


NA 


NA 


723 


766 


862 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,669 


5 to 
16°F 




Local 99% Winter Design Temperature: 5 to lO'F 


6 


NA 


78 


121 


166 


214 


252 


301 


416 


8 


NA 


94 


135 


182 


230 


269 


312 


423 


10 


NA 


111 


149 


198 


250 


289 


331 


430 


15 


NA 


NA 


193 


247 


305 


346 


393 


485 


20 


NA 


NA 


NA 


293 


360 


408 


450 


547 


30 


NA 


NA 


NA 


377 


450 


531 


580 


682 


50 


NA 


NA 


NA 


NA 


NA 


797 


853 


972 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1,833 


-10 to 
4"F 


Local 99% Winter Design Temperature: -10 to 4°F 


6 


NA 


NA 


145 


196 


249 


296 


349 


484 


8 


NA 


NA 


159 


213 


269 


320 


371 


494 


10 


NA 


NA 


175 


231 


292 


339 


397 


513 


15 


NA 


NA 


NA 


283 


351 


404 


457 


586 


20 


NA 


NA 


NA 


333 


408 


468 


528 


650 


30 


NA 


NA 


NA 


NA 


NA 


603 


667 


805 


50 


NA 


NA 


NA 


NA 


NA 


NA 


955 


1,003 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


-ll-For 
Lower 


Local 99% Winter Design Temperature: -11°F or Lower 


Not recommended for any vent configurations 



Note: See Figure B-19 in Appendix B for a map showing local 99 percent 
winter design temperatures in the United States. 

For SI: °C = [(°F - 32]/1.8, 1 inch = 25.4 mm, 1 square inch = 645.16 mnf, 
1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 



2006 INTERNATIONAL FUEL GAS CODE'^ 



113 



1 1 4 2006 INTERNATIONAL FUEL GAS CODE® 



CHAPTER 6 

SPECIFIC APPLIANCES 



SECTION 601 (IFGC) 
GENERAL 

601.1 Scope. This chapter shall govern the approval, design, 
installation, construction, maintenance, alteration and repair of 
the appliances and equipment specifically identified herein. 



SECTION 605 (IFGC) 
VENTED GAS FIREPLACE HEATERS 

605.1 GeneraL Vented gas fireplace heaters shall be installed 
in accordance with the manufacturer's installation instructions, 
shall be tested in accordance with ANSI Z21.88 and shall be 
designed and equipped as specified in Section 602.2. 



SECTION 602 (IFGC) 

DECORATIVE APPLIANCES 

FOR INSTALLATION IN FIREPLACES 

602.1 General. Decorative appliances for installation in 
approved solid fuel-burning fireplaces shall be tested in accor- 
dance with ANSI Z21.60 and shall be installed in accordance 
with the manufacturer's installation instructions. Manually 
lighted natural gas decorative appliances shall be tested in 
accordance with ANSI Z21.84. 

602.2 Flame safeguard device. Decorative appliances for 
installation in approved solid fuel-burning fireplaces, with the 
exception of those tested in accordance with ANSI Z21.84, 
shall utilize a direct ignition device, an ignitor or a pilot flame 
to ignite the fuel at the main burner, and shall be equipped with 
a flame safeguard device. The flame safeguard device shall 
automatically shut off the fuel supply to a main burner or group 
of burners when the means of ignition of such burners becomes 
inoperative. 

602.3 Prohibited installations. Decorative appliances for 
installation in fireplaces shall not be installed where prohibited 
by Section 303.3. 



SECTION 603 (IFGC) 
LOG LIGHTERS 

603.1 General. Log lighters shall be tested in accordance with 
CSA 8 and installed in accordance with the manufacturer's 
installation instructions. 



SECTION 604 (IFGC) 

VENTED GAS FIREPLACES 

(DECORATIVE APPLIANCES) 

604.1 General. Vented gas fireplaces shall be tested in accor- 
dance with ANSI Z21.50, shall be installed in accordance with 
the manufacturer's installation instructions and shall be 
designed and equipped as specified in Section 602.2. 

604.2 Access. Panels, grilles and access doors that are required 
to be removed for normal servicing operations shall not be 
attached to the building. 



SECTION 606 (IFGC) 
INCINERATORS AND CREMATORIES 

606.1 General. Incinerators and crematories shall be installed 
in accordance with the manufacturer's installation instructions. 



SECTION 607 (IFGC) 
COMMERCIAL-INDUSTRIAL INCINERATORS 

607.1 Incinerators, commercial-industrial. Commer- 
cial-industrial-type incinerators shall be constructed and 
installed in accordance with NFPA 82. 



SECTION 608 (IFGC) 
VENTED WALL FURNACES 

608.1 General. Vented wall furnaces shall be tested in accor- 
dance with ANSI Z21.86/CSA 2.32 and shall be installed in | 
accordance with the manufacturer's installation instructions. 

608.2 Venting. Vented wall furnaces shall be vented in accor- 
dance with Section 503. 

608.3 Location. Vented wall furnaces shall be located so as not 
to cause a fire hazard to walls, floors, combustible furnishings 
or doors. Vented wall furnaces installed between bathrooms 
and adjoining rooms shall not circulate air from bathrooms to 
other parts of the building. 

608.4 Door swing. Vented wall furnaces shall be located so 
that a door cannot swing within 12 inches (305 mm) of an air 
inlet or air outlet of such furnace measured at right angles to the 
opening. Doorstops or door closers shall not be installed to 
obtain this clearance. 

608.5 Ducts prohibited. Ducts shall not be attached to wall 
furnaces. Casing extension boots shall not be installed unless 
listed as part of the appliance. 

608.6 Access. Vented wall furnaces shall be provided with 
access for cleaning of heating surfaces, removal of burners, 
replacement of sections, motors, controls, filters and other 
working parts, and for adjustments and lubrication of parts 
requiring such attention. Panels, grilles and access doors that 
are required to be removed for normal servicing operations 
shall not be attached to the building construction. 



2006 INTERNATIONAL FUEL GAS CODE"^ 



115 



SPECIFIC APPLIANCES 



SECTION 609 (IFGC) 
FLOOR FURNACES 

609.1 General. Floor furnaces shall be tested in accordance 
I with ANSI Z21.86/CSA 2.32 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 

609.2 Placement. The following provisions apply to floor fur- 
naces: 

1 . Floors . Floor furnaces shall not be installed in the floor of 
any doorway, stairway landing, aisle or passageway of 
any enclosure, public or private, or in an exitway from 
any such room or space. 

2. Walls and comers. The register of a floor furnace with a 
horizontal warm-air outlet shall not be placed closer than 
6 inches (152 mm) to the nearest wall. A distance of at 
least 18 inches (457 mm) from two adjoining sides of the 
floor furnace register to walls shall be provided to elimi- 
nate the necessity of occupants walking over the 
warm-air discharge. The remaining sides shall be per- 
mitted to be placed not closer than 6 inches (152 mm) to a 
wall. Wall-register models shall not be placed closer 
than 6 inches (152 mm) to a comer. 

3. Draperies. The furnace shall be placed so that a door, 
drapery or similar object cannot be nearer than 12 inches 
(305 mm) to any portion of the register of the fumace. 

4. Floor constmction. Floor fumaces shall not be installed 
in concrete floor constmction built on grade. 

5. Thermostat. The controlling thermostat for a floor fur- 
nace shall be located within the same room or space as 
the floor fumace or shall be located in an adjacent room 
or space that is permanently open to the room or space 
containing the floor fumace. 

609.3 Bracing. The floor around the fumace shall be braced 
and headed with a support framework designed in accordance 
with the International Building Code. 

609.4 Clearance. The lowest portion of the floor fumace shall 
have not less than a 6-inch (152 mm) clearance from the grade 
level; except where the lower 6-inch (152 mm) portion of the 
floor fumace is sealed by the manufacturer to prevent entrance 
of water, the minimum clearance shall be not less than 2 inches 
(51 mm). Where such clearances cannot be provided, the 
ground below and to the sides shall be excavated to form a pit 
under the fumace so that the required clearance is provided 
beneath the lowest portion of the fumace. A 12-inch (305 mm) 
minimum clearance shall be provided on all sides except the 
control side, which shall have an 18-inch (457 mm) minimum 
clearance. 

609.5 First floor installation. Where the basement story level 
below the floor in which a floor fumace is installed is utiUzed as 
habitable space, such floor fumaces shall be enclosed as speci- 
fied in Section 609.6 and shall project into a nonhabitable 
space. 

609.6 Upper floor installations. Floor fumaces installed in 
upper stories of buildings shall project below into nonhabitable 
space and shall be separated from the nonhabitable space by an 
enclosure constmcted of noncombustible materials. The floor 
fumace shall be provided with access, clearance to all sides and 



bottom of not less than 6 inches (152 mm) and combustion air 
in accordance with Section 304. 



SECTION 610 (IFGC) 
DUCT FURNACES 

610.1 General. Duct fumaces shall be tested in accordance 
with ANSI Z83.8 or UL 795 and shall be installed in accor- | 
dance with the manufacturer's installation instmctions. 

610.2 Access panels. Ducts connected to duct fumaces shall 
have removable access panels on both the upstream and down- 
stream sides of the fumace. 

610.3 Location of draft hood and controls. The controls, 
combustion air inlets and draft hoods for duct fumaces shall be 
located outside of the ducts. The draft hood shall be located in 
the same enclosure from which combustion air is taken. 

610. 4 Circulating air. Where a duct fumace is installed so that 
supply ducts convey air to areas outside the space containing 
the fumace, the retum air shall also be conveyed by a duct(s) 
sealed to the fumace casing and terminating outside the space 
containing the fumace. 

The duct fumace shall be installed on the positive pressure 
side of the circulating air blower. 



SECTION 611 (IFGC) 

NONRECIRCULATING DIRECT-FIRED 

INDUSTRIAL AIR HEATERS 

611.1 General. Nonrecirculating direct-fired industrial air 
heaters shall be listed to ANSI Z83.4/CSA 3.7 and shall be 
installed in accordance with the manufacturer's instmctions. 

611.2 Installation. Nonrecirculating direct-fired industrial air 
heaters shall not be used to supply any area containing sleeping 
quarters. Nonrecirculating direct-fired industrial air heaters 
shall be installed only in industrial or commercial occupancies. 
Nonrecirculating direct-fired industrial air heaters shall be per- 
mitted to provide ventilation air. 

611.3 Clearance from combustible materials. 

Nonrecirculating direct-fired industrial air heaters shall be 
installed with a clearance from combustible materials of not 
less than that shown on the rating plate and in the manufac- 
turer's instmctions. 

611.4 Supply air. All air handled by a nonrecirculating 
direct-fired industrial air heater, including combustion air, shall 
be ducted directly from the outdoors. 

611.5 Outdoor air louvers. If outdoor air louvers of either the 
manual or automatic type are used, such devices shall be 
proven to be in the open position prior to allowing the main 
bumers to operate. 

611.6 Atmospheric vents and gas reliefs or bleeds. 

Nonrecirculating direct-fired industrial air heaters with valve 
train components equipped with atmospheric vents or gas 
reliefs or bleeds shall have their atmospheric vent lines or gas 
reliefs or bleeds lead to the outdoors. Means shall be employed 
on these lines to prevent water from entering and to prevent 
blockage by insects and foreign matter. An atmospheric vent 



116 



2006 INTERNATIONAL FUEL GAS CODE'' 



SPECIFIC APPLIANCES 



line shall not be required to be provided on a valve train compo- 
nent equipped with a listed vent limiter. 

611.7 Relief opening. The design of the installation shall 
include provisions to permit nonrecirculating direct-fired 
industrial air heaters to operate at rated capacity without 
overpressurizing the space served by the heaters by taking into 
account the structure's designed infiltration rate, providing 
properly designed relief openings or an interlocked power 
exhaust system, or a combination of these methods. The struc- 
ture's designed infiltration rate and the size of relief openings 
shall be determined by approved engineering methods. Relief 
openings shall be permitted to be louvers or counterbalanced 
gravity dampers. Motorized dampers or closable louvers shall 
be permitted to be used, provided they are verified to be in their 
full open position prior to main burner operation. 

611.8 Access. Nonrecirculating direct-fired industrial air heat- 
ers shall be provided with access for removal of burners; 
replacement of motors, controls, filters and other working 
parts; and for adjustment and lubrication of parts requiring 
maintenance. 

611.9 Purging. Inlet ducting, where used, shall be purged by 
not less than four air changes prior to an ignition attempt. 



SECTION 612 (IFGC) 

RECIRCULATING DIRECT-FIRED 

INDUSTRIAL AIR HEATERS 

612.1 GeneraL Recirculating direct-fired industrial air heaters 
shall be listed to ANSI Z83.18 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 

612.2 Location. Recirculating direct-fired industrial air heat- 
ers shall be installed only in industrial and commercial occu- 
pancies. Recirculating direct-fired air heaters shall not serve 
any area containing sleeping quarters. Recirculating 
direct-fired industrial air heaters shall not be installed in haz- 
ardous locations or in buildings that contain flammable solids, 
liquids or gases, explosive materials or substances that can 
become toxic when exposed to flame or heat. 

612.3 Installation. Direct-fired industrial air heaters shall be 
permitted to be installed in accordance with their listing and the 
manufacturer's instructions. Direct-fired industrial air heaters 
shall be installed only in industrial or commercial occupancies. 
Direct-fired industrial air heaters shall be permitted to provide 
fresh air ventilation. 

612.4 Clearance from combustible materials. Direct-fired 
industrial air heaters shall be installed with a clearance from 
combustible material of not less than that shown on the label 
and in the manufacturer's instructions. 

612.5 Air supply. Air to direct-fired industrial air heaters shall 
be taken from the building, ducted directly from outdoors, or a 
combination of both. Direct-fired industrial air heaters shall 
incorporate a means to supply outside ventilation air to the 
space at a rate of not less than 4 cubic feet per minute per 1 ,000 
Btu per hour (0.38 m^ per min per kW) of rated input of the 
heater. If a separate means is used to supply ventilation air, an 
interlock shall be provided so as to lock out the main burner 
operation until the mechanical means is verified. Where out- 



side air dampers or closing louvers are used, they shall be 
verified to be in the open position prior to main burner opera- 
tion. 

612.6 Atmospheric vents, gas reliefs or bleeds. Direct-fired 
industrial air heaters with valve train components equipped 
with atmospheric vents, gas reliefs or bleeds shall have their 
atmospheric vent lines and gas reliefs or bleeds lead to the out- 
doors. 

Means shall be employed on these lines to prevent water 
from entering and to prevent blockage by insects and foreign 
matter. An atmospheric vent line shall not be required to be pro- 
vided on a valve train component equipped with a listed vent 
hmiter. 

612.7 Relief opening. The design of the installation shall 
include adequate provision to permit direct-fired industrial air 
heaters to operate at rated capacity by taking into account the 
structure's designed infiltration rate, providing properly 
designed relief openings or an interlocked power exhaust sys- 
tem, or a combination of these methods. The structure's 
designed infiltration rate and the size of relief openings shall be 
determined by approved engineering methods. Relief openings 
shall be permitted to be louvers or counterbalanced gravity 
dampers. Motorized dampers or closable louvers shall be per- 
mitted to be used, provided they are verified to be in their full 
open position prior to main burner operation. 



SECTION 613 (IFGC) 
CLOTHES DRYERS 

613.1 General. Clothes dryers shall be tested in accordance 
with ANSI Z21.5.1 or ANSI Z21.5.2 and shall be installed in 
accordance with the manufacturer's installation instructions. 



SECTION 614 (IFGC) 
CLOTHES DRYER EXHAUST 

[M] 614.1 Installation. Clothes dryers shall be exhausted in 
accordance with the manufacturer's instructions. Dryer 
exhaust systems shall be independent of all other systems, shall 
convey the moisture and any products of combustion to the out- 
side of the building. 

[M] 614.2 Duct penetrations. Ducts that exhaust clothes dry- 
ers shall not penetrate or be located within any fireblocking, 
draftstopping or any wall, floor/ceiling or other assembly 
required by the International Building Code to be fire-resis- 
tance rated, unless such duct is constructed of galvanized steel 
or aluminum of the thickness specified in Table 603.4 of the 
International Mechanical Code and the fire-resistance rating is 
maintained in accordance with the International Building 
Code. Fire dampers shall not be installed in clothes dryer 
exhaust duct systems. 

[M] 614.3 Cleaning access. Each vertical duct riser for dryers 
hsted to ANSI Z21.5.2 shall be provided with a cleanout or 
other means for cleaning the interior of the duct. 

[M] 614.4 Exhaust installation. Exhaust ducts for clothes 
dryers shall terminate on the outside of the building and shall 
be equipped with a backdraft damper. Screens shall not be 



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installed at the duct termination. Ducts shall not be connected 
or installed with sheet metal screws or other fasteners that will 
obstruct the flow. Clothes dryer exhaust ducts shall not be con- 
nected to a vent connector, vent or chimney. Clothes dryer 
exhaust ducts shall not extend into or through ducts or ple- 
nums. 

[M] 614.5 Makeup air. Installations exhausting more than 200 
cfm (0.09 mVs) shall be provided with makeup air. Where a 
closet is designed for the installation of a clothes dryer, an 
opening having an area of not less than 100 square inches (645 
mm^) for makeup air shall be provided in the closet enclosure, 
or makeup air shall be provided by other approved means. 

[M] 614.6 Domestic clothes dryer ducts. Exhaust ducts for 
domestic clothes dryers shall be constructed of metal and shall 
have a smooth interior finish. The exhaust duct shall be a mini- 
mum nominal size of 4 inches (102 mm) in diameter. The entire 
exhaust system shall be supported and secured in place. The 
male end of the duct at overlapped duct joints shall extend in 
the direction of airflow. Clothes dryer transition ducts used to 
connect the appliance to the exhaust duct system shall be metal 
and hmited to a single length not to exceed 8 feet (2438 mm) 
and shall be listed and labeled for the application. Transition 
ducts shall not be concealed within construction. 

[M] 614.6.1 Maximum length. The maximum length of a 
clothes dryer exhaust duct shall not exceed 25 feet (7620 
mm) from the dryer location to the outlet terminal. The 
maximum length of the duct shall be reduced 2V2 feet (762 
mm) for each 45-degree (0.79 rad) bend and 5 feet (1524 
mm) for each 90-degree (1.57 rad) bend. The maximum 
length of the exhaust duct does not include the transition 
duct. 

Exception: Where the make and model of the clothes 
dryer to be installed is known and the manufacturer's 
installation instructions for such dryer are provided to 
the code official, the maximum length of the exhaust 
duct, including any transition duct, shall be permitted to 
be in accordance with the dryer manufacturer's installa- 
tion instructions. 

[M] 614.6.2 Rough-in required. Where a compartment or 
space for a domestic clothes dryer is provided, an exhaust 
duct system shall be installed. 

[M] 614.7 Commercial clothes dryers. The installation of 
dryer exhaust ducts serving Type 2 clothes dryers shall comply 
with the appliance manufacturer's installation instructions. 
Exhaust fan motors installed in exhaust systems shall be 
located outside of the airstream. In multiple installations, the 
fan shall operate continuously or be interlocked to operate 
when any individual unit is operating. Ducts shall have a mini- 
mum clearance of 6 inches (152 mm) to combustible materials. 



SECTION 615 (IFGC) 
SAUNA HEATERS 

615.1 General. Sauna heaters shall be installed in accordance 
with the manufacturer's installation instructions. 



615.2 Location and protection. Sauna heaters shall be located 
so as to minimize the possibility of accidental contact by a per- 
son in the room. 

615.2.1 Guards. Sauna heaters shall be protected from 
accidental contact by an approved guard or barrier of mate- 
rial having a low coefficient of thermal conductivity. The 
guard shall not substantially affect the transfer of heat from 
the heater to the room. 

615.3 Access. Panels, grilles and access doors that are required 
to be removed for normal servicing operations shall not be 
attached to the building. 

615.4 Combustion and dilution air intakes. Sauna heaters of 
other than the direct- vent type shall be installed with the draft 
hood and combustion air intake located outside the sauna room. 
Where the combustion air inlet and the draft hood are in a dress- 
ing room adjacent to the sauna room, there shall be provisions 
to prevent physically blocking the combustion air inlet and the 
draft hood inlet, and to prevent physical contact with the draft 
hood and vent assembly, or warning notices shall be posted to 
avoid such contact. Any warning notice shall be easily read- 
able, shall contrast with its background and the wording shall 
be in letters not less than V4 inch (6.4 mm) high. 

615.5 Combustion and ventilation air. Combustion air shall 
not be taken from inside the sauna room. Combustion and ven- 
tilation air for a sauna heater not of the direct- vent type shall be 
provided to the area in which the combustion air inlet and draft 
hood are located in accordance with Section 304. 

615.6 Heat and time controls. Sauna heaters shall be 
equipped with a thermostat which will limit room temperature 
to 194°F (90°C). If the thermostat is not an integral part of the 
sauna heater, the heat-sensing element shall be located within 6 
inches (152 mm) of the ceiling. If the heat-sensing element is a 
capillary tube and bulb, the assembly shall be attached to the 
wall or other support, and shall be protected against physical 
damage. 

615.6.1 Timers. A timer, if provided to control main burner 
operation, shall have a maximum operating time of 1 hour. 
The control for the timer shall be located outside the sauna 
room. 

615.7 Sauna room. A ventilation opening into the sauna room 
shall be provided. The opening shall be not less than 4 inches 
by 8 inches (102 mm by 203 mm) located near the top of the 
door into the sauna room. 

615.7.1 Warning notice. The following permanent notice, 
constructed of approved material, shall be mechanically 
attached to the sauna room on the outside: 

WARNING: DO NOT EXCEED 30 MINUTES IN 
SAUNA. EXCESSIVE EXPOSURE CAN BE HARMFUL 
TO HEALTH. ANY PERSON WITH POOR HEALTH 
SHOULD CONSULT A PHYSICIAN BEFOB^ USING 

SAUNA. 

The words shall contrast with the background and the 
wording shall be in letters not less than V4 inch (6.4 mm) 
high. 

Exception: This section shall not apply to one- and 
two-family dwellings. 



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SECTION 616 (IFGG) 
ENGINE AND GAS TURBINE- 
POWERED EQUIPMENT 

616.1 Powered equipment. Permanently installed equipment 
powered by internal combustion engines and turbines shall be 
installed in accordance with the manufacturer's installation 
instructions and NFPA 37. 



SECTION 617 (IFGC) 
POOL AND SPA HEATERS 

617.1 General. Pool and spa heaters shall be tested in accor- 
dance with ANSI Z21.56 and shall be installed in accordance 
with the manufacturer's installation instructions. 



SECTION 618 (IFGC) 
FORCED-AIR WARM-AIR FURNACES 

618.1 General. Forced-air warm-air furnaces shall be tested in 
accordance with ANSI Z21 .47 or UL 795 and shall be installed 
in accordance with the manufacturer's installation instructions. 

618.2 Forced-air furnaces. The minimum unobstructed total 
area of the outside and return air ducts or openings to a 
forced-air warm-air furnace shall be not less than 2 square 
inches for each 1,000 Btu/h (4402 mm^AV) output rating 
capacity of the furnace and not less than that specified in the 
furnace manufacturer's installation instructions. The minimum 
unobstructed total area of supply ducts from a forced- air 
warm-air furnace shall be not less than 2 square inches for each 
1,000 Btu/h (4402 mm^AV) output rating capacity of the fur- 
nace and not less than that specified in the furnace manufac- 
turer's installation instructions. 

Exception: The total area of the supply air ducts and outside 
and return air ducts shall not be required to be larger than the 
minimum size required by the furnace manufacturer's 
installation instructions. 

618.3 Dampers. Volume dampers shall not be placed in the air 
inlet to a furnace in a manner that will reduce the required air to 
the furnace. 

618.4 Circulating air ducts for forced-air warm-air furnaces. 

Circulating air for fuel-burning, forced-air-type, warm-air fur- 
naces shall be conducted into the blower housing from outside 
the furnace enclosure by continuous air-tight ducts. 

618.5 Prohibited sources. Outside or return air for a forced-air 
heating system shall not be taken from the following locations: 

1. Closer than 10 feet (3048 mm) from an appliance vent 
outlet, a vent opening from a plumbing drainage system 
or the discharge outlet of an exhaust fan, unless the outlet 
is 3 feet (914 mm) above the outside air inlet. 

2. Where there is the presence of objectionable odors, 
fumes or flammable vapors; or where located less than 
10 feet (3048 mm) above the surface of any abutting pub- 
lic way or driveway; or where located at grade level by a 
sidewalk, street, alley or driveway. 



3. A hazardous or insanitary location or a refrigeration 
machinery room as defined in the International Mechan- 
ical Code. 

4. A room or space, the volume of which is less than 25 per- 
cent of the entire volume served by such system. Where 
connected by a permanent opening having an area sized 
in accordance with Section 618.2, adjoining rooms or 
spaces shall be considered as a single room or space for 
the purpose of determining the volume of such rooms or 
spaces. 

Exception: The minimum volume requirement shall 
not apply where the amount of return air taken from a 
room or space is less than or equal to the amount of 
supply air delivered to such room or space. 

5. A room or space containing an appliance where such a 
room or space serves as the sole source of return air. 

Exception: This shall not apply where: 

1. The appliance is a direct- vent appliance or an 
appliance not requiring a vent in accordance 
with Section 501.8. 

2. The room or space complies with the following 
requirements: 

2.1. The return air shall be taken from a 
room or space having a volume exceed- 
ing 1 cubic foot for each 10 Btu/h (9.6 
L/W) of combined input rating of all 
fuel-burning appUances therein. 

2.2. The volume of supply air discharged 
back into the same space shall be 
approximately equal to the volume of 
return air taken from the space. 

2.3. Return-air inlets shall not be located 
within 10 feet (3048 mm) of any appli- 
ance firebox or draft hood in the same 
room or space. 

3. Rooms or spaces containing solid fuel-burning 
appliances, provided that return-air inlets are 
located not less than 10 feet (3048 mm) from 
the firebox of such appliances. 

6. A closet, bathroom, toilet room, kitchen, garage, 
mechanical room, boiler room or furnace room. 

618.6 Screen. Required outdoor air inlets for residential por- 
tions of a building shall be covered with a screen having 
V4-inch (6.4 mm) openings. Required outdoor air inlets serving 
a nonresidential portion of a building shall be covered with 
screen having openings larger than V4 inch (6.4 mm) and not 
larger than 1 inch (25 mm). 

618.7 Return-air limitation. Return air from one dwelUng 
unit shall not be discharged into another dwelling unit. 



SECTION 619 (IFGC) 
CONVERSION BURNERS 

619.1 Conversion burners. The installation of conversion 
burners shall conform to ANSI Z2 1 . 8 . 



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SECTION 620 (IFGC) 
UNIT HEATERS 

620.1 General. Unit heaters shall be tested in accordance with 
ANSI Z83.8 and shall be installed in accordance with the man- 
ufacturer's installation instructions. 

620.2 Support. Suspended-type unit heaters shall be sup- 
ported by elements that are designed and constructed to accom- 
modate the weight and dynamic loads. Hangers and brackets 
shall be of noncombustible material. 

620.3 Ductwork. Ducts shall not be connected to a unit heater 
unless the heater is listed for such installation. 

620.4 Clearance. Suspended-type unit heaters shall be 
installed with clearances to combustible materials of not less 
than 1 8 inches (457 mm) at the sides, 12 inches (305 mm) at the 
bottom and 6 inches (152 mm) above the top where the unit 
heater has an internal draft hood or 1 inch (25 mm) above the 
top of the sloping side of the vertical draft hood. 

Floor-mounted-type unit heaters shall be installed with 
clearances to combustible materials at the back and one side 
only of not less than 6 inches (152 mm). Where the flue gases 
are vented horizontally, the 6-inch (152 mm) clearance shall be 
measured from the draft hood or vent instead of the rear wall of 
the unit heater. Floor-mounted-type unit heaters shall not be 
installed on combustible floors unless Hsted for such installa- 
tion. 

Clearances for servicing all unit heaters shall be in accor- 
dance with the manufacturer's installation instructions. 

Exception: Unit heaters listed for reduced clearance shall 
be permitted to be installed with such clearances in accor- 
dance with their listing and the manufacturer's instructions. 



SECTION 621 (IFGC) 
UNVENTED ROOM HEATERS 

621.1 General. Unvented room heaters shall be tested in accor- 
dance with ANSI Z21 . 1 1 .2 and shall be installed in accordance 
with the conditions of the listing and the manufacturer's instal- 
lation instructions. Unvented room heaters utilizing fuels other 
than fuel gas shall be regulated by the International Mechani- 
cal Code. 

621.2 Prohibited use. One or more unvented room heaters 
shall not be used as the sole source of comfort heating in a 
dwelling unit. 

621.3 Input rating. Unvented room heaters shall not have an 
input rating in excess of 40,000 Btu/h (1 1.7 Kw). 

621.4 Prohibited locations. Unvented room heaters shall not 
be installed within occupancies in Groups A, E and I. The loca- 
tion of unvented room heaters shall also comply with Section 
303.3. 

621.5 Room or space volume. The aggregate input rating of 
all unvented appliances installed in a room or space shall not 
exceed 20 Btu/h per cubic foot (207 W/m^) of volume of such 
room or space. Where the room or space in which the equip- 
ment is installed is directly connected to another room or space 
by a doorway, archway or other opening of comparable size 



that cannot be closed, the volume of such adjacent room or 
space shall be permitted to be included in the calculations. 

621.6 Oxygen-depletion safety system. Unvented room heat- 
ers shall be equipped with an oxygen-depletion-sensitive 
safety shutoff system. The system shall shut off the gas supply 
to the main and pilot burners when the oxygen in the surround- 
ing atmosphere is depleted to the percent concentration speci- 
fied by the manufacturer, but not lower than 18 percent. The 
system shall not incorporate field adjustment means capable of 
changing the set point at which the system acts to shut off the 
gas supply to the room heater. 

621.7 Unvented decorative room heaters. An unvented deco- 
rative room heater shall not be installed in a factory-built fire- | 
place unless the fireplace system has been specifically tested, 
listed and labeled for such use in accordance with UL 127. 

621.7.1 Ventless firebox enclosures. Ventless firebox I 
enclosures used with unvented decorative room heaters I 
shall be hsted as complying with ANSI Z2 1 .9 1 . | 



SECTION 622 (IFGC) 
VENTED ROOM HEATERS 

622.1 General. Vented room heaters shall be tested in accor- 
dance with ANSI Z21.86/CSA 2.32, shall be designed and | 
equipped as specified in Section 602.2 and shall be installed in 
accordance with the manufacturer's installation instructions. 



SECTION 623 (IFGC) 
COOKING APPLIANCES 

623.1 Cooking appliances. Cooking appliances that are 
designed for permanent installation, including ranges, ovens, 
stoves, broilers, grills, fryers, griddles, hot plates and barbe- 
cues, shall be tested in accordance with ANSI Z21.1, ANSI 
Z21.58 or ANSI Z83.ll and shall be installed in accordance 
with the manufacturer's installation instructions. 

623.2 Prohibited location. Cooking appliances designed, 
tested, listed and labeled for use in commercial occupancies 
shall not be installed within dwelling units or within any area 
where domestic cooking operations occur. 

623.3 Domestic appliances. Cooking appliances installed 
within dwelling units and within areas where domestic cooking 
operations occur shall be listed and labeled as household-type 
appliances for domestic use. 

623.4 Domestic range installation. Domestic ranges installed 
on combustible floors shall be set on their own bases or legs and 
shall be installed with clearances of not less than that shown on 
the label. 

623.5 Open-top broiler unit hoods. A ventilating hood shall 
be provided above a domestic open-top broiler unit, unless oth- 
erwise listed for forced down draft ventilation. 

623.5.1 Clearances. A minimum clearance of 24 inches 
(610 mm) shall be maintained between the cooking top and 
combustible material above the hood. The hood shall be at 
least as wide as the open-top broiler unit and be centered 
over the unit. 



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623.6 Commercial cooking appliance venting. Commercial 
cooking appliances, other than those exempted by Section 
501 .8, shall be vented by connecting the appliance to a vent or 
chimney in accordance with this code and the appliance manu- 
facturer's instructions or the appliance shall be vented in accor- 
dance with Section 505.1.1. 



SECTION 624 (IFGC) 
WATER HEATERS 

624.1 General. Water heaters shall be tested in accordance 
with ANSI Z 21 . 10. 1 and ANSI Z 21 . 10.3 and shall be installed 
in accordance with the manufacturer's installation instructions 
Water heaters utilizing fuels other than fuel gas shall be regu- 
lated by the International Mechanical Code. 

624.1.1 Installation requirements. The requirements for 
water heaters relative to sizing, relief valves, drain pans and 
scald protection shall be in accordance with the Interna- 
tional Plumbing Code. 

624.2 Water heaters utilized for space heating. Water heaters 
utilized both to supply potable hot water and provide hot water 
for space-heating applications shall be listed and labeled for 
such applications by the manufacturer and shall be installed in 
accordance with the manufacturer's installation instructions 
and the International Plumbing Code. 



SECTION 625 (IFGC) 
REFRIGERATORS 

625.1 General. Refrigerators shall be tested in accordance 
with ANSI Z21 . 19 and shall be installed in accordance with the 
manufacturer's installation instructions. 

Refrigerators shall be provided with adequate clearances for 
ventilation at the top and back, and shall be installed in accor- 
dance with the manufacturer's instructions. If such instructions 
are not available, at least 2 inches (5 1 mm) shall be provided 
between the back of the refrigerator and the wall and at least 12 
inches (305 mm) above the top. 



SECTION 626 (IFGC) 
GAS-FIRED TOILETS 

626.1 General. Gas-fired toilets shall be tested in accordance 
with ANSI Z21.61 and installed in accordance with the manu- 
facturer's installation instructions. 

626.2 Clearance. A gas-fired toilet shall be installed in accor- 
dance with its listing and the manufacturer's instructions, pro- 
vided that the clearance shall in any case be sufficient to afford 
ready access for use, cleanout and necessary servicing. 



SECTION 627 (IFGC) 
AIR-CONDITIONING EQUIPMENT 

627.1 General. Gas-fu:ed air-conditioning equipment shall be 
tested in accordance with ANSI Z2 1.40.1 or ANSI Z2 1.40.2 
and shall be installed in accordance with the manufacturer's 
installation instructions. 



627.2 Independent piping. Gas piping serving heating equip- 
ment shall be permitted to also serve cooling equipment where 
such heating and cooling equipment cannot be operated simul- 
taneously (see Section 402). 

627.3 Connection of gas engine-powered air conditioners. 

To protect against the effects of normal vibration in service, gas 
engines shall not be rigidly connected to the gas supply piping. 

627.4 Clearances for indoor installation. Air-conditioning 
equipment installed in rooms other than alcoves and closets 
shall be installed with clearances not less than those specified 
in Section 308.3 except that air-conditioning equipment listed 
for installation at lesser clearances than those specified in Sec- 
tion 308.3 shall be permitted to be installed in accordance with 
such listing and the manufacturer's instructions and air-condi- 
tioning equipment listed for installation at greater clearances 
than those specified in Section 308.3 shall be installed in accor- 
dance with such listing and the manufacturer's instructions. 

Air-conditioning equipment installed in rooms other than 
alcoves and closets shall be permitted to be installed with 
reduced clearances to combustible material, provided that the 
combustible material is protected in accordance with Table 
308.2. 

627.5 Alcove and closet installation. Air-conditioning equip- 
ment installed in spaces such as alcoves and closets shall be 
specifically listed for such installation and installed in accor- 
dance with the terms of such listing. The installation clearances 
for air-conditioning equipment in alcoves and closets shall not 
be reduced by the protection methods described in Table 308.2. 

627.6 Installation. Air-conditioning equipment shall be 
installed in accordance with the manufacturer's instructions. 
Unless the equipment is listed for installation on a combustible 
surface such as a floor or roof, or unless the surface is protected 
in an approved manner, equipment shall be installed on a sur- 
face of noncombustible construction with noncombustible 
material and surface finish and with no combustible material 
against the underside thereof. 

627.7 Plenums and air ducts. A plenum supplied as a part of 
the air-conditioning equipment shall be installed in accordance 
with the equipment manufacturer's instructions. Where a ple- 
num is not supplied with the equipment, such plenum shall be 
installed in accordance with the fabrication and installation 
instructions provided by the plenum and equipment manufac- 
turer. The method of connecting supply and return ducts shall 
facilitate proper circulation of air. 

Where air-conditioning equipment is installed within a 
space separated from the spaces served by the equipment, the 
air circulated by the equipment shall be conveyed by ducts that 
are sealed to the casing of the equipment and that separate the 
circulating air from the combustion and ventilation air. 

627.8 Refrigeration coils. A refrigeration coil shall not be 
installed in conjunction with a forced-air furnace where circu- 
lation of cooled air is provided by the furnace blower, unless 
the blower has sufficient capacity to overcome the external 
static resistance imposed by the duct system and cooling coil at 
the air throughput necessary for heating or cooling, whichever 
is greater. Furnaces shall not be located upstream from cooling 
units, unless the cooling unit is designed or equipped so as not 



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to develop excessive temperature or pressure. Refrigeration 
coils shall be installed in parallel with or on the downstream 
side of central furnaces to avoid condensation in the heating 
element, unless the furnace has been specifically listed for 
downstream installation. With a parallel flow arrangement, the 
dampers or other means used to control flow of air shall be suf- 
ficiently tight to prevent any circulation of cooled air through 
the furnace. 

Means shall be provided for disposal of condensate and to 
prevent dripping of condensate onto the heating element. 

627.9 Cooling units used with heating boilers. Boilers, 
where used in conjunction with refrigeration systems, shall be 
installed so that the chilled medium is piped in parallel with the 
heating boiler with appropriate valves to prevent the chilled 
medium from entering the heating boiler. Where hot water 
heating boilers are connected to heating coils located in 
air-handling units where they might be exposed to refrigerated 
air circulation, such boiler piping systems shall be equipped 
with flow control valves or other automatic means to prevent 
gravity circulation of the boiler water during the cooling cycle. 

627.10 Switches in electrical supply line. Means for inter- 
rupting the electrical supply to the air-conditioning equipment 
and to its associated cooling tower (if supplied and installed in 
a location remote from the air conditioner) shall be provided 
within sight of and not over 50 feet (15 240 mm) from the air 
conditioner and cooling tower. 



SECTION 628 (IFGC) 
ILLUMINATING APPLIANCES 

628.1 General. Illuminating appliances shall be tested in 
accordance with ANSI Z21.42 and shall be installed in accor- 
dance with the manufacturer's installation instructions. 

628.2 Mounting on buildings. Illuminating appliances 
designed for wall or ceiling mounting shall be securely 
attached to substantial structures in such a manner that they are 
not dependent on the gas piping for support. 

628.3 Mounting on posts. Illuminating appliances designed 
for post mounting shall be securely and rigidly attached to a 
post. Posts shall be rigidly mounted. The strength and rigidity 
of posts greater than 3 feet (914 mm) in height shall be at least 
equivalent to that of a 2V2-inch-diameter (64 mm) post con- 
structed of 0.064-inch-thick (1.6-mm) steel or a 1-inch (25.4 
mm) Schedule 40 steel pipe. Posts 3 feet (914 mm) or less in 
height shall not be smaller than a V4-inch (19.1 mm) Schedule 
40 steel pipe. Drain openings shall be provided near the base of 
posts where there is a possibility of water collecting inside 
them. 

628.4 Appliance pressure regulators. Where an appliance 
pressure regulator is not supplied with an illuminating appli- 
ance and the service line is not equipped with a service pressure 
regulator, an appliance pressure regulator shall be installed in 
the line to the illuminating appliance. For multiple installa- 
tions, one regulator of adequate capacity shall be permitted to 
serve more than one illuminating appliance. 



SECTION 629 (IFGC) 
SMALL CERAMIC KILNS 

629.1 General. Ceramic kilns with a maximum interior vol- 
ume of 20 cubic feet (0.566 m^) and used for hobby and non- 
commercial purposes shall be installed in accordance with the 
manufacturer's installation instructions and the provisions of 
this code. 



SECTION 630 (IFGC) 
INFRARED RADIANT HEATERS 

(530.1 General. Infrared radiant heaters shall be tested in accor- 
dance with ANSI Z83.6 and shall be installed in accordance 
with the manufacturer's installation instructions. 

630.2 Support. Infrared radiant heaters shall be fixed in a posi- 
tion independent of gas and electric supply lines. Hangers and 
brackets shall be of noncombustible material. 



SECTION 631 (IFGC) 
BOILERS 

631.1 Standards. Boilers shall be listed in accordance with the 
requirements of ANSI Z21.13 or UL 795. If applicable, the 
boiler shall be designed and constructed in accordance with the 
requirements of ASME CSD-1 and as applicable, the ASME 
Boiler and Pressure Vessel Code, Sections 1, 11, FV, V and IX 
and NFPA 85. 

631.2 Installation. In addition to the requirements of this code, 
the installation of boilers shall be in accordance with the manu- 
facturer's instructions and the International Mechanical Code. 
Operating instructions of a permanent type shall be attached to 
the boiler. Boilers shall have all controls set, adjusted and tested 
by the installer. A complete control diagram together with 
complete boiler operating instructions shall be furnished by the 
installer. The manufacturer's rating data and the nameplate 
shall be attached to the boiler. 

631.3 Clearance to combustible materials. Clearances to 
combustible materials shall be in accordance with Section 
308.4. 



SECTION 632 (IFGC) 

EQUIPMENT INSTALLED IN EXISTING 

UNLISTED BOILERS 

632.1 General. Gas equipment installed in existing unlisted 
boilers shall comply with Section 63 1 . 1 and shall be installed in 
accordance with the manufacturer's instructions and the Inter- 
national Mechanical Code. 



SECTION 633 (IFGC) 
STATIONARY FUEL-CELL POWER SYSTEMS 

[F] 633.1 General. Stationary fuel-cell power systems having 
a power output not exceeding 10 MW shall be tested in accor- 
dance with ANSI CSA America FC 1 and shall be installed in 
accordance with the manufacturer's installation instructions 
and NFPA 853. 



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SPECIFIC APPLIANCES 



SECTION 634 (IFGS) 
CHIMNEY DAMPER OPENING AREA 

634.1 Free opening area of chimney dampers. Where an 
unlisted decorative appliance for installation in a vented fire- 
place is installed, the fireplace damper shall have a permanent 
free opening equal to or greater than specified in Table 634. 1 . 



SECTION 635 (IFGC) 
GASEOUS HYDROGEN SYSTEMS 

635.1 Installation. The installation of gaseous hydrogen sys- 
tems shall be in accordance with the applicable requirements of 
this code, the International Fire Code and the International 
Building Code. 



TABLE 634.1 

FREE OPENING AREA OF CHIMNEY DAMPER FOR VENTING FLUE GASES 

FROM UNLISTED DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES 



CHIMNEY HEIGHT 
(feet) 


MINIMUM PERMANENT FREE OPENING (square inches^ 


8 


13 


20 


29 


39 


51 


64 


Appliance input rating (Btu per hour) 


6 


7,800 


14,000 


23,200 


34,000 


46,400 


62,400 


8,000 


8 


8,400 


15,200 


25,200 


37,000 


50,400 


68,000 


86,000 


10 


9,000 


16,800 


27,600 


40,400 


55,800 


74,400 


96,400 


15 


9,800 


18,200 


30,200 


44,600 


62,400 


84,000 


108,800 


20 


10,600 


20,200 


32,600 


50,400 


68,400 


94,000 


122,200 


30 


11,200 


21,600 


36,600 


55,200 


76,800 


105,800 


138,600 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square inch = 645. 16 m^, 1 British thermal unit per hour = 0.2931 W. 

a. The &st six minimum permanent free openings (8 to 5 1 square inches) correspond approximately to the cross-sectional areas of chimneys having diameters of 3 
through 8 inches, respectively. The 64-square-inch opening corresponds to the cross-sectional area of standard 8-inch by 8-inch chimn^' tile. 



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1 24 2006 INTERNATIONAL FUEL GAS CODE® 



CHAPTER 7 

GASEOUS HYDROGEN SYSTEMS 



SECTION 701 (IFGC) 
GENERAL 

701.1 Scope. The installation of gaseous hydrogen systems 
shall comply with this chapter and Chapters 30 and 35 of the 
International Fire Code. Compressed gases shall also comply 
with Chapter 27 of the International Fire Code for general 
requirements. 

701.2 Permits. Permits shall be required as set forth in Section 
106 and as required by the International Fire Code. 



SECTION 702 (IFGC) 
GENERAL DEFINITIONS 

702.1 Definitions. The following words and terms shall, for the 
purposes of this chapter and as used elsewhere in this code, 
have the meanings shown herein. 

HYDROGEN CUTOFF ROOM. A room or space which is 
intended exclusively to house a gaseous hydrogen system. 

HYDROGEN-GENERATING APPLIANCE. A self con 
tained package or factory-matched packages of integrated sys- 
tems for generating gaseous hydrogen. Hydrogen-generating 
appliances utilize electrolysis, reformation, chemical or other 
processes to generate hydrogen. 

GASEOUS HYDROGEN SYSTEM. An assembly of piping, 
devices and apparatus designed to generate, store, contain, dis- 
tribute or transport a nontoxic, gaseous hydrogen containing 
mixture having at least 95-percent hydrogen gas by volume and 
not more than 1 -percent oxygen by volume. Gaseous hydrogen 
systems consist of items such as compressed gas containers, 
reactors and appurtenances, including pressure regulators, 
pressure relief devices, manifolds, pumps, compressors and 
interconnecting piping and tubing and controls. 



SECTION 703 (IFGC) 
GENERAL REQUIREMENTS 

703.1 Hydrogen-generating and refueling operations. Ven- 
tilation shall be required in accordance with Section 703.1.1, 
703.1.2 or 703.1.3 in public garages, private garages, repair 
garages, automotive motor fuel-dispensing facilities and park- 
ing garages that contain hydrogen-generating appUances or 
refueling systems. For the purpose of this section, rooms or 
spaces that are not part of the living space of a dwelling unit and 
that communicate directly with a private garage through open- 
ings shall be considered to be part of the private garage. 

703.1.1 Natural ventilation. Indoor locations intended for 
hydrogen-generating or refueling operations shall be lim- 
ited to a maximum floor area of 850 square feet (79 m^) and 
shall communicate with the outdoors in accordance with 
Sections 703. 1.1.1 and 703 .1.1.2. The maximum rated out- 
put capacity of hydrogen generating appliances shall not 
exceed 4 standard cubic feet per minute (0.00189 mVs) of 






hydrogen for each 250 square feet (23.2 m^) of floor area in | 
such spaces. The minimum cross-sectional dimension of air 
openings shall be 3 inches (76 mm). Where ducts are used, 
they shall be of the same cross-sectional area as the free area 
of the openings to which they connect. In such locations, 
equipment and appliances having an ignition source shall be 
located such that the source of ignition is not within 12 I 
inches (305 mm) of the ceiling. I 

703.1.1.1 Two openings. Two permanent openings shall 
be provided within the garage. The upper opening shall 
be located entirely within 12 inches (305 mm) of the ceil- 
ing of the garage. The lower opening shall be located 
entirely within 12 inches (305 mm) of the floor of the 
garage. Both openings shall be provided in the same 
exterior wall. The openings shall communicate directly 
with the outdoors and shall have a minimum free area of 
V2 square foot per 1,000 cubic feet (1 mV610 m^) of 
garage volume. 

703.1.1.2 Louvers and grilles. In calculating the free 
area required by Section 703.1.1.1, the required size of 
openings shall be based on the net free area of each open- 
ing. If the free area through a design of louver or grille is 
known, it shall be used in calculating the size opening 
required to provide the free area specified. If the design 
and free area are not known, it shall be assumed that 
wood louvers will have 25-percent free area and metal 
louvers and grilles will have 75-percent free area. Lou- 
vers and grilles shall be fixed in the open position. 

703.1.2 Mechanical ventilation. Indoor locations intended 
for hydrogen-generating or refueling operations shall be 
ventilated in accordance with Section 502. 1 6 of the Interna- 
tional Mechanical Code. In such locations, equipment and 
appliances having an ignition source shall be located such 
that the source of ignition is below the mechanical ventila- 
tion outlet(s). 

703.1.3 Specially engineered installations. As an alterna- 
tive to the provisions of Section 703.1.1 and 703.1.2, the 
necessary supply of air for ventilation and dilution of flam- 
mable gases shall be provided by an approved engineered 
system. 

[F] 703.2 Containers, cylinders and tanks. Compressed gas 
containers, cylinders and tanks shall comply with Chapters 30 
and 35 of the International Fire Code. 

[F] 703.2.1 Limitations for indoor storage and use. Flam- 
mable gas cylinders in occupancies regulated by the Inter- 
national Residential Code shall not exceed 250 cubic feet 
(7.1 m^) at normal temperature and pressure (NTP). 

[F] 703.2.2 Design and construction. Compressed gas 
containers, cylinders and tanks shall be designed, con- 
structed and tested in accordance with the Chapter 27 of the 
International Fire Code, ASME Boiler and Pressure Vessel 
Code (Section VIII) or DOTn 49 CFR, Parts 100-180. 



2006 INTERNATIONAL FUEL GAS CODE® 



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[F] 703.3 Pressure relief devices. Pressure relief devices shall 
be provided in accordance with Sections 703.3.1 through 
703.3.8. Pressure relief devices shall be sized and selected in 
accordance with CGA S-1.1, CGA S-1.2 and CGA S-1.3. 

[F] 703.3.1 Valves between pressure relief devices and 
containers. Valves including shutoffs, check valves and 
other mechanical restrictions shall not be installed between 
the pressure relief device and container being protected by 
the relief device. 

Exception: A locked-open shutoff valve on containers 
equipped with multiple pressure-relief device installa- 
tions where the arrangement of the valves provides the 
full required flow through the minimum number of 
required relief devices at all times. 

[F] 703.3.2 Installation. Valves and other mechanical 
restrictions shall not be located between the pressure relief 
device and the point of release to the atmosphere. 

[F] 703.3.3 Containers. Containers shall be provided with 
pressure relief devices in accordance with the ASME Boiler 
and Pressure Vessel Code (Section VIII), DOTn 49 CFR, 
Parts 100-180 and Section 703.3.7. 

[F] 703.3.4 Vessels other than containers. Vessels other 
than containers shall be protected with pressure relief 
devices in accordance with the ASME Boiler and Pressure 
Vessel Code (Section VIII), or DOTn 49 CFR, Parts 
100-180. 

[F] 703.3.5 Sizing. Pressure relief devices shall be sized in 
accordance with the specifications to which the container 
was fabricated. The relief device shall be sized to prevent 
the maximum design pressure of the container or system 
from being exceeded. 

[F] 703.3.6 Protection. Pressure relief devices and any 
associated vent piping shall be designed, installed and 
located so that their operation will not be affected by water 
or other debris accumulating inside the vent or obstructing 
the vent. 

[F] 703.3.7 Access. Pressure relief devices shall be located 
such that they are provided with ready access for inspection 
and repair. 

[F] 703.3.8 Configuration. Pressure relief devices shall be 
arranged to discharge unobstructed in accordance with Sec- 
tion 2209 of the International Fire Code. Discharge shall be 
directed to the outdoors in such a manner as to prevent 
impingement of escaping gas on personnel, containers, 
equipment and adjacent structures and to prevent introduc- 
tion of escaping gas into enclosed spaces. The discharge 
shall not terminate under eaves or canopies. 

Exception: This section shall not apply to DOTn-speci- 
fied containers with an internal volume of 2 cubic feet 
(0.057 m^) or less. 

[F] 703.4 Venting. Relief device vents shall be terminated in an 
approved location in accordance with Section 2209 of the 
International Fire Code. 

[F] 703.5 Security. Compressed gas containers, cylinders, 
tanks and systems shall be secured against accidental 



dislodgement in accordance with Chapter 30 of the Interna- 
tional Fire Code. 

[F] 703.6 Electrical wiring and equipment. Electrical wiring 
and equipment shall comply with the ICC Electrical Code. 



SECTION 704 (IFGC) 
PIPING, USE AND HANDLING 

704.1 Applicability. Use and handling of containers, cylin- 
ders, tanks and hydrogen gas systems shall comply with this 
section. Gaseous hydrogen systems, equipment and machinery 
shall be listed or approved. 

704.1.1 Controls. Compressed gas system controls shall be 
designed to prevent materials from entering or leaving pro- 
cess or reaction systems at other than the intended time, rate 
or path. Automatic controls shall be designed to be fail safe 
in accordance with accepted engineering practice. 

704.1.2 Piping systems. Piping, tubing, valves and fittings 
conveying gaseous hydrogen shall be designed and installed 
in accordance with Sections 704.1.2.1 through 704.1.2.5.1, 
Chapter 27 of the International Fire Code, and ASME 
B 3 1 . 3 . Cast-iron pipe, valves and fittings shall not be used. 

704.1.2.1 Sizing. Gaseous hydrogen piping shall be 
sized in accordance with approved engineering methods. 

704.1.2.2 Identification of hydrogen piping systems. 

Hydrogen piping systems shall be marked in accordance 
with ANSI A 13.1. Markings used for piping systems 
shall consist of the name of the contents and shall include 
a direction-of-flow arrow. Markings shall be provided at 
all of the following locations: 

1. At each valve. 

2. At wall, floor and ceiling penetrations. 

3. At each change of direction. 

4. At intervals not exceeding 20 feet (6096 mm). 

704.1.2.3 Piping design and construction. Piping and 
tubing materials shall be 300 series stainless steel or | 
materials listed or approved for hydrogen service and the 
use intended through the full range of operating condi- 
tions to which they will be subjected. Piping systems 
shall be designed and constructed to provide allowance 
for expansion, contraction, vibration, settlement and fire 
exposure. 

704.1.2.3.1 Prohibited locations. Piping shall not be 
installed in or through a circulating air duct; clothes 
chute; chimney or gas vent; ventilating duct; dumb- 
waiter; or elevator shaft. Piping shall not be concealed I 
or covered by the surface of any wall, floor or ceiling . | 

704.1.2.3.2 Interior piping. Except for through pen- 
etrations, piping located inside of buildings shall be 
installed in exposed locations and provided with 
ready access for visual inspection. 

704.1.2.3.3 Underground piping. Underground pip- 
ing, including joints and fittings, shall be protected 
from corrosion and installed in accordance with 
approved engineered methods. 



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704.1.2.3.4 Piping through foundation wall. Under- 
ground piping shall not penetrate the outer foundation 
or basement wall of a building. 

704.1.2.3.5 Protection against physical damage. In 

concealed locations, where piping other than stainless 
steel piping, stainless steel tubing or black steel is 
installed through holes or notches in wood studs, 
joists, rafters or similar members less than 1 .5 inches 
(38 mm) from the nearest edge of the member, the 
pipe shall be protected by shield plates. Shield plates 
shall be a minimum of Vi5-inch-thick (1.6 mm) steel, 
shall cover the area of the pipe where the member is 
notched or bored and shall extend a minimum of 4 
inches (102 mm) above sole plates, below top plates 
and to each side of a stud, joist or rafter. 

704.1.2.3.6 Piping outdoors. Piping installed above 
ground, outdoors, shall be securely supported and 
located where it will be protected from physical dam- 
age. Piping passing through an exterior wall of a 
building shall be encased in a protective pipe sleeve. 
The annular space between the piping and the sleeve 
shall be sealed from the inside such that the sleeve is 
ventilated to the outdoors. Where passing through an 
exterior wall of a building, the piping shall also be 
protected against corrosion by coating or wrapping 
with an inert material. Below-ground piping shall be 
protected against corrosion. 

704.1.2.3.7 Settlement. Piping passing through con- 
crete or masonry walls shall be protected against dif- 
ferential settlement. 

704.1.2.4 Joints. Joints in piping and tubing in hydrogen 
service shall be listed as complying with ASME B3 1 .3 to 
include the use of welded, brazed, flared, socket, slip and 
compression fittings. Gaskets and sealants used in 
hydrogen service shall be listed as complying with 
ASME B31.3. Threaded and flanged connections shall 
not be used in areas other than hydrogen cutoff rooms 
and outdoors. 

704.1.2.4.1 Brazed joints. Brazing alloys shall have a 
melting point greater than 1,000°F (538°C). 

704.1.2.4.2 Electrical continuity. Mechanical joints 
shall maintain electrical continuity through the joint 
or a bonding jumper shall be installed around the 
joint. 

704.1.2.5 Valves and piping components. Valves, regu- 
lators and piping components shall be listed or approved 
for hydrogen service, shall be provided with access and 
shall be designed and constructed to withstand the maxi- 
mum pressure to which such components will be sub- 
jected. 

704.1.2.5.1 Shutoff valves on storage containers 
and tanks. Shutoff valves shall be provided on all 
storage container and tank connections except for 
pressure relief devices. Shutoff valves shall be pro- 
vided with ready access. 



704.2 Upright use. Compressed gas containers, cylinders and 
tanks, except those with a water volume less than 1 .3 gallons (5 
L) and those designed for use in a horizontal position, shall be 
used in an upright position with the valve end up. An upright 
position shall include conditions where the container, cylinder 
or tank axis is inclined as much as 45 degrees (0.79 rad) from 
the vertical. 

704.3 Material-specific regulations. In addition to the 
requirements of this section, indoor and outdoor use of hydro- 
gen compressed gas shall comply with the material-specific 
provisions of Chapters 30 and 35 of the International Fire 
Code. 

704.4 Handling. The handling of compressed gas containers, 
cylinders and tanks shall comply with Chapter 27 of the Inter- 
national Fire Code. 



SECTION 705 (IFGC) 
TESTING OF HYDROGEN PIPING SYSTEMS 

705.1 General. Prior to acceptance and initial operation, all 
piping installations shall be inspected and pressure tested to 
determine that the materials, design fabrication and installation 
practices comply with the requirements of this code. 

705.2 Inspections. Inspections shall consist of a visual exami- 
nation of the entire piping system installation and a pressure 
test. Hydrogen piping systems shall be inspected in accordance 
with this code. Inspection methods such as outlined in ASME 
B31.3 shall be permitted where specified by the design engi- 
neer and approved by the code official. Inspections shall be 
conducted or verified by the code official prior to system oper- 
ation. 

705.3 Pressure tests. A hydrostatic or pneumatic leak test shall 
be performed. Testing of hydrogen piping systems shall utilize 
testing procedures identified in ASME B31.3 or other 
approved methods, provided that the testing is performed in 
accordance with the minimum provisions specified in Sections 
705.3.1 through 705.4.1. 

705.3.1 Hydrostatic leak tests. The hydrostatic test pres- 
sure shall be not less than one-and-one-half times the maxi- 
mum working pressure, and not less than 100 psig (689.5 
kPa gauge). 

705.3.2 Pneumatic leak tests. The pneumatic test pressure 
shall be not less than one-and-one-half times the maximum 
working pressure for systems less than 125 psig (862 kPa 
gauge) and not less than 5 psig (34.5 kPa gauge), whichever 
is greater. For working pressures at or above 125 psig (862 
kPa gauge), the pneumatic test pressure shall be not less 
than 110 percent of the maximum working pressure. 

705.3.3 Test limits. Where the test pressure exceeds 125 
psig (862 kPa gauge), the test pressure shall not exceed a 
value that produces hoop stress in the piping greater than 50 
percent of the specified minimum yield strength of the pipe. 

705.3.4 Test medium. Deionized water shall be utihzed to 
perform hydrostatic pressure testing and shall be obtained 
from a potable source. The medium utilized to perform 
pneumatic pressure testing shall be air, nitrogen, carbon 
dioxide or an inert gas; oxygen shall not be used. 



2006 INTERNATIONAL FUEL GAS CODE® 



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GASEOUS HYDROGEN SYSTEMS 



705.3.5 Test duration. The minimum test duration shall be 
V2 hour. The test duration shall be not less than V2 hour for 
each 500 cubic feet (14.2 m^) of pipe volume or fraction 
thereof. For piping systems having a volume of more than 
24,000 cubic feet (680 m^), the duration of the test shall not 
be required to exceed 24 hours. The test pressure required in 
Sections 705.3.1 and 705.3.2 shall be maintained for the 
entire duration of the test. 

705.3.6 Test gauges. Gauges used for testing shall be as fol- 
lows: 

1. Tests requiring a pressure of 10 psig (68.95 kPa 
gauge) or less shall utilize a testing gauge having 
increments of 0.10 psi (0.6895 kPa) or less. 

2. Tests requiring a pressure greater than 10 psig (68.98 
kPa gauge) but less than or equal to 100 psig (689.5 
kPa gauge) shall utilize a testing gauge having incre- 
ments of 1 psi (6.895 kPa) or less. 

3. Tests requiring a pressure greater than 100 psig 
(689.5 kPa gauge) shall utilize a testing gauge having 
increments of 2 psi (13.79 kPa) or less. 

Exception: Measuring devices having an equiva- 
lent level of accuracy and resolution shall be per- 
mitted where specified by the design engineer and 
approved by the code official. 

705.3.7 Test preparation. Pipe joints, including welds, 
shall be left exposed for examination during the test. 

705.3.7.1 Expansion joints. Expansion joints shall be 
provided with temporary restraints, if required, for the 
additional thrust load under test. 

705.3.7.2 Equipment disconnection. Where the piping 
system is connected to appliances, equipment or compo- 
nents designed for operating pressures of less than the 
test pressure, such appliances, equipment and compo- 
nents shall be isolated from the piping system by discon- 
necting them and capping the outlet(s). 

705.3.7.3 Equipment isolation. Where the piping sys- 
tem is connected to appliances, equipment or compo- 
nents designed for operating pressures equal to or greater 
than the test pressure, such appliances, equipment and 
components shall be isolated from the piping system by 
closing the individual appliance, equipment or compo- 
nent shutoff valve(s). 

705.4 Detection of leal^s and defects. The piping system shall 
withstand the test pressure specified for the test duration speci- 
fied without showing any evidence of leakage or other defects. 
Any reduction of test pressures as indicated by pressure gauges 
shall indicate a leak within the system. Piping systems shall not 
be approved except where this reduction in pressure is attrib- 
uted to some other cause. 

705.4.1 Corrections. Where leakage or other defects are 
identified, the affected portions of the piping system shall be 
repaired and retested. 

705.5 Purging of gaseous hydrogen piping systems. Purging 
shall comply with Sections 705.5.1 through 705.5.4. 



705.5.1 Removal from service. Where piping is to be 
opened for servicing, addition or modification, the section 
to be worked on shall be isolated from the supply at the near- 
est convenient point and the line pressure vented to the out- 
doors. The remaining gas in this section of pipe shall be 
displaced with an inert gas. 

705.5.2 Placing in operation. Prior to placing the system 
into operation, the air in the piping system shall be displaced 
with inert gas. The inert gas flow shall be continued without 
interruption until the vented gas is free of air. The inert gas 
shall then be displaced with hydrogen until the vented gas is 
free of inert gas. The point of discharge shall not be left unat- 
tended during purging. After purging, the vent opening shall 
be closed. 

705.5.3 Discharge of purged gases. The open end of piping 
systems being purged shall not discharge into confined 
spaces or areas where there are sources of ignition except 
where precautions are taken to perform this operation in a 
safe manner by ventilation of the space, control of purging 
rate and elimination of all hazardous conditions. 

705.5.3.1 Vent pipe outlets for purging. Vent pipe out- 
lets for purging shall be located such that the inert gas and 
fuel gas is released outdoors and not less than 8 feet 
(2438 mm) above the adjacent ground level. Gases shall 
be discharged upward or horizontally away from adja- 
cent walls to assist in dispersion. Vent outlets shall be 
located such that the gas will not be trapped by eaves or 
other obstructions and shall be at least 5 feet (1524 mm) 
from building openings and lot lines of properties that 
can be built upon. 

705.5.4 Placing equipment in operation. After the piping 
has been placed in operation, all equipment shall be purged 
in accordance with Section 707.2 and then placed in opera- 
tion, as necessary. 



SECTION 706 (IFGC) 
LOCATION OF GASEOUS HYDROGEN SYSTEMS 

[F] 706.1 General. The location and installation of gaseous 
hydrogen systems shall be in accordance with Sections 706.2 
and 706.3. 

Exception: Stationary fuel-cell power plants in accordance 
with Section 633. 

[F] 706.2 Indoor gaseous hydrogen systems. Gaseous hydro- 
gen systems shall be located in indoor rooms or areas in accor- 
dance with one of the following: 

1 . Inside a building in a hydrogen cutoff room designed and 
constructed in accordance with Section 420 of the Inter- 
national Building Code; 

2. Inside a building not in a hydrogen cutoff room where 
the gaseous hydrogen system is listed and labeled for 
indoor installation and installed in accordance with the 
manufacturer's installation instructions; and 

3 . Inside a building in a dedicated hydrogen fuel dispensing 
area having an aggregate hydrogen delivery capacity not 



128 



2006 INTERNATIONAL FUEL GAS CODE® 



GASEOUS HYDROGEN SYSTEMS 



greater than 12 SCFM and designed and constructed in 
accordance with Section 703.1. 

[F] 706.3 Outdoor gaseous hydrogen systems. Gaseous 
hydrogen systems shall be located outdoors in accordance with 
Section 2209.3.2 of the International Fire Code. 



SECTION 707 (IFGC) 

OPERATION AND MAINTENANCE OF 

GASEOUS HYDROGEN SYSTEMS 

[F] 707.1 Maintenance. Gaseous hydrogen systems and 
detection devices shall be maintained in accordance with the 
International Fire Code and the manufacturer's installation 
instructions. 

[F] 707.2 Purging. Purging of gaseous hydrogen systems, 
other than piping systems purged in accordance with Section 
705.5, shall be in accordance with Section 221 1.8 of the Inter- 
national Fire Code or in accordance with the system manufac- 
turer's instructions. 



SECTION 708 (IFGC) 

DESIGN OF LIQUEFIED HYDROGEN SYSTEMS 

ASSOCIATED WITH HYDROGEN 

VAPORIZATION OPERATIONS 

[F] 708.1 General. The design of liquefied hydrogen systems 
shall comply with Chapter 32 of the International Fire Code. 



2006 INTERNATIONAL FUEL GAS CODE® 



129 



1 30 2006 INTERNATIONAL FUEL GAS CODE® 



IFGC/IFGS CHAPTER 8 

REFERENCED STANDARDS 



This chapter hsts the standards that are referenced in various sections of this document. The standards are listed herein by the 
promulgating agency of the standard, the standard identification, the effective date and title, and the section or sections of this 
document that reference the standard. The application of the referenced standards shall be as specified in Section 102.8. 



ANSI 



American National Standards Institute 

25 West 43rd Street 

Fourth Floor 

New York, NY 10036 

Referenced 

in code 

Title section number 

Scheme for the Identification of piping systems 704.1.2.2 

Stationery Fuel Cell Power Systems 633.1 

Interior Gas Piping Systems Using Corrugated Stainless Steel Tubing with Addenda LCla-1999 and LClb-2001 403.5.4 

Household Cooking Gas Appliances with Addenda Z21.1a-2003 and Z21.1b-2003. 623.1 

Gas Clothes Dryers - Volume I -Type 1 Clothes Dryers with Addenda Z21.5.1a-2003 613.1 

Gas Clothes Dryers - Volume II- Type 2 Clothes Dryers with Addenda Z21.5.2a-2003 and Z21.5.2b-2003 613.1, 614.3 

Installation of Domestic Gas Conversion Burners 619.1 

Gas Water Heaters - Volume I - Storage, Water Heaters with Input Ratings of 75,000 Btu per Hour or Less - 
with Addenda Z21.10.1a-2002 624.1 

Gas Water Heaters - Volume III - Storage, Water Heaters with Input Ratings Above 75,000 Btu per hour, 

Circulating and Instantaneous - with Addenda Z21.10.3a-2003 and Z21.10.3b-2004 624.1 

Gas-fired Room Heaters - Volume n - Unvented Room Heaters with Addenda Z21.11.2a-2003 621.1 

Gas-fired Low-Pressure Steam and Hot Water Boilers 631.1 

Manually Operated Gas Valves for Appliances, Appliance Connector Valves, and Hose End Valves with 
Addenda Z21.15a-2001(R2003) 409.1.1 

Refrigerators Using Gas (R1999) Fuel 625.1 

Connectors for Gas Appliances 411.1 

Gas-fired Heat Activated Air Conditioning and Heat Pump Appliances— with Addendum Z21.40.1a-1997 (R2002> . . . 627.1 

Gas-fired Work Activated Air Conditioning and Heat Pump Apphances (Internal Combustion) — with 

Addendum Z21.40.2a-97 (R2002) 627.1 

Gas-fired Illuminating Appliances 628. 1 

Gas-fired Central Furnaces 618.1 

Vented Gas Fireplaces - with Addenda Z21.50a-2003 604.1 

Gas-fired Pool Heaters - with Addenda Z21.56a-2004 and Z21.56b-2004 616.1 

Outdoor Cooking Gas Apphances— with Addendum Z21.58a-1998 (R2002) and Z21.58b-2002 623.1 

Decorative Gas Appliances for Installation in SoUd-fuel Burning Fireplaces - with Addenda Z21.60a-2003 602.1 

Toilets, Gas-Fired 625.1 

Connectors for Movable Gas Appliances - with Addenda Z21.69a-2003 411.1 

Connectors for Outdoor Gas Appliances and Manufectured Homes 41 1.1, 41 1.2 

Line Pressure Regulators .410.1 

Manually-Lighted, Natural Gas Decorative Gas Appliances for Installation in 

SoUd Fuel Burning Fireplaces - with Addenda Z21.84a-2003 602.1, 602.2 

Gas-Fired Vented Space Heating Appliances - with Addenda Z21.86a-2002 and Z21.86b-2002 608.1, 609.1, 622.1 

Vented Gas Fireplace Heaters with Addenda Z21.88a-2003 and Z21.88b-2004 605.1 

Ventless Firebox Enclosures for Gas-Fired Unvented Decorative Room Heaters 621.7.1 

Non-Recirculating Direct-Gas-Fired Industrial Air Heaters 611.1 

Gas-Fired Infrared Heaters 630.1 

Gas Unit Heaters and Gas-Fired Duct Furnaces - with Addenda Z83.8a-2003 620.1 

Gas Food Service Equipment - witii Addenda Z83.11a-2004 623.1 

Recirculating Du-ect Gas-Fired Industiial Air Heaters with Addenda Z83.18a 2001 and Z83.18b-2003 612.1 



Standard 
reference 
number 



ANSIA13.1-96 

ANSI CSA- America FC 1-03 

LC 1—97 

Z21.1— 03 

Z21.5.1— 02 

Z21.5.2— 01 

Z21.8— 94(R2002) 

Z21.10.1— 04 

Z21.10.3— 01 

Z21.11.2— 02 
Z21.13— 04 
Z21.15— 97(R2003) 

Z21.19— 02 
Z21.24— 97 
Z2 1.40. 1—96 (R2002) 
Z21.40.2— 96(R2002) 

Z21.42— 93 (R2002) 
Z2 1.47— 03 
Z2 1.50— 03 
Z21.56— 01 
Z21.58— 95(R2002) 
Z2 1.60— 03 
Z21.61— 83 (R 1996) 
Z21.69— 02 
Z21.75/CSA6.27— 01 
Z21.80— 03 
Z21.84— 02 

Z21.86— 04 
Z21.88— 02 
Z21.91— 01 
Z83.4— 03 
Z83.6— 90 (R 1998) 
Z83.8— 02 
Z83.ll— 02 
Z83.18— 00 



2006 INTERNATIONAL FUEL GAS CODE® 



131 



REFERENCED STANDARDS 



ASME 



American Society of Mechanical Engineers 

Three Park Avenue 

New York, NY 10016-5990 



Standard 




Referenced 


reference 




in code 


number 


Title 


section number 



B 1.20. 1—83 (Reaffirmed 2001) 

B 16. 1—98 

B 16.20— 98 

B3 1.3-02 

B 16.33— 02 

B 16.44-01 

B31.3— 99 

B36.10M— 00 

BPVC— 01 

CSD-1— 02 



Pipe Threads, General Purpose (inch) 403.9 

Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125 and 250 403.12 

Metallic Gaskets for Pipe Flanges Ring-joint, Spiral-wound, and Jacketed — with Addendum B16.20a-2000 403.12 

Process Piping 704.1.2.4, 704.12, 705.2, 705.3 

Manually Operated Metallic Gas Valves for Use in Gas Piping Systems up to 125 psig (Sizes 1 2 through 2) 409.1.1 

Manually Operated Metallic Gas Valves for Use in House Piping Systems 409.1.1 

Process Piping 704.1.2, 705.2, 705.3 

Welded and Seamless Wrought-steel Pipe 403.4.2 

ASME Boiler & Pressure Vessel Code (2001 Edition) (Section I, II, IV, V & IX) 630.1, 703.2.2, 703.3.3, 703.3.4 

Controls and Safety Devices for Automatically Fired Boilers 631.1 



ASTM 



ASTM International 

100 Ban- Harbor Drive 

West Conshohocken, PA 19428-2959 

Referenced 

in code 

Title section number 

Specification for Pipe, Steel, Black and Hot Dipped Zinc-coated Welded and Seamless 403.4.2 

Specification for Seamless Carbon Steel Pipe for High-temperature Service 403.4.2 

Specification for Copper Brazed Steel Tubing 403.5.1 

Specification for Electric Resistance-welded Coiled Steel Tubing for Gas and Fuel Oil Lines 403.5.1 

Specification for Seamless Copper Water Tube 403.5.2 

Specification for Aluminum and Aluminum-alloy Drawn Seamless Tubes 403.5.3 

Specification for Aluminum and Aluminum-alloy, Seamless Pipe and Seamless Extruded Tube 403.4.4, 403.5.3 

Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service 403.5.2 

Withdrawn No Replacement (Specification for Fireclay Brick Refi-actories for 

Heavy Duty Stationary Boiler Service) 503.10.2.5 

Specification for Clay Flue Linings 501.12 

Specification for Thermoplastic Gas Pressure Pipe, Tbbing, and Fittings 403.6, 403.6.1, 403.11, 404.14.2 



Standard 
reference 
number 



A 53/A 53M— 02 

A 106— 04 

A 254—97 (2002) 

A 539—99 

B88— 03 

B 210— 02 

B 241/B 241M— 02 

B 280— 03 

C 64—72 (1977) 

C 315—02 
D 25 13— 04a 



AWWA 



American Water Works Association 
6666 West Quincy Avenue 
Denver, CO 80235 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



cm— 00 



Rubber-Gasket Joints for Ductile-iron Pressure Pipe and Fittings 403.12 



CGA 



Compressed Gas Association 

1725 Jefferson Davis Highway, 5th Floor 

Arlington, VA 22202-4102 

Referenced 

in code 

Title section number 

Pressure Relief Device Standards — Part 1 — Cyhnders for Compressed Gases 703.3 

Pressure Relief Device Standards — Part 2 — Cargo and Portable Tanks for Compressed Gases 703.3 

Pressure Relief Device Standards — Part 3 — Stationary Storage Containers for Compressed Gases 703.3 



Standard 
reference 
number 



S- 1.1— (2002) 
S-1.2— (1995) 
S- 1.3— (1995) 



132 



2006 INTERNATIONAL FUEL GAS CODE*" 



REFERENCED STANDARDS 



CSA 



CSA America Inc. 

8501 E. Pleasant Valley Rd. 

Cleveland, OH USA 44131-5575 

Referenced 
in code 

Title section number 

Stationary Fuel Cell Power Systems 633.1 

Manually Operated Gas Valves for Use in House Piping Systems 409.1.1 

Requirements for Gas-fired Log Lighters for Wood Burning Fireplaces with Revisions through January 1999 603.1 



Standard 
reference 
Part number 



ANSI CSA America FCl-03 
CSA Requirement 3-88 
CSA 8—93 



DOTn 



Department of Transportation 
400 Seventh St. SW. 
Washington, DC 20590 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



49 CFR,Parts 192.281(e) & 

192.283 (b) 

49 CFR Parts 100-180 



Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards 
Hazardous Materials Regulations 



403.6.1 

.703.2.2, 703.3.3, 703.3.4 



ICC 



Standard 




Referenced 


reference 




in code 


number 


Title 


section number 



IBC— 06 

ICC EC— 06 
lEBC— 06 
lECC— 06 
IFC— 06 

IMC— 06 

IPC— 06 
IRC— 06 



International Code Council, Inc. 
500 New Jersey Ave, NW 
6th Floor 
Washington, DC 20001 

Title 

International Building Code"" 102.2.1, 201.3, 301.10, 301.11, 301.12, 301.14, 302.1, 302.2, 

305.6, 306.6, 401.1.1,412.6, 413.3, 413.3.1, 501.1, 501.3, 501.12, 501.15.4, 609.3, 614.2, 706.1, 706.3 

ICC Electrical Code®— Administrative Provisions 201.3, 306.3.1, 306.4.1, 306.5.2, 309.2, 413.8.2.4, 703.6 

International Existing Building Code 101 .2 

International Energy Conservation Code 301.2 

International Fire Code® 201.3, 303.4, 401.2, 412.1, 412.6, 412.7, 412.7.3, 412.8, 

413.1, 413.3, 413.3.1, 413.4, 413.8.2.5, 701.1, 701.2, 703.2, 703.2.2, 
703.3.8, 703.4, 703.5, 704.1.2, 704.3, 704.4, 706.2, 706.3.4, 706.3.5, 706.3.6, 707.2, 707.1, 708.1 

International Mechanical Code® 101.2.5, 201.3, 301.1.1, 301.13, 304.11, 501.1, 

614.2, 618.5, 621.1, 624.1, 631.2, 632.1, 703.1.2, 706.3.2 

International Plumbing Code® 201.3, 301.6, 624.1.1, 624.2 

International Residential Code 703.2.1 



MSS 



Manufacturers Standardization Society of 
the Valve and Fittings Industry 
127 Park Street, Northeast 
Vienna, VA 22180 



Standard 
reference 
number 



Title 



Referenced 

in code 

section number 



SP-6— 01 
SP-58— 93 



Standard Finishes for Contact Faces of Pipe Flanges and Connecting-end Flanges of Valves and Fittings 
Pipe Hangers and Supports — Materials, Design and Manufecture 



.403.12 
. .407.2 



NFPA 



30A-03 
37—02 



National Fire Protection Association 

1 Batterymarch Pike 

PO. Box 9101 

Quincy, MA 02269-9101 



Standard 




Referenced 


reference 




in code 


number 


Title 


section number 



Code for Motor Fuel Dispensing Facilities and Repair Garages ........ 

Installation and Use of Stationary Combustion Engines and Gas l\irbines , 



.305.5 
.616.1 



2006 INTERNATIONAL FUEL GAS CODE® 



133 



REFERENCED STANDARDS 



50A— 99 

51—02 

58—04 

82—04 

85—04 

211—03 

853—03 



NFPA — continued 

Gaseous Hydrogen Systems at Consumer Sites 706.1 

Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes 414.1 

Liquefied Petroleum Gas Code 401.2, 402.6.1, 403.6.2, 403.11 

Incinerators, Waste and Linen Handling Systems and Equipment 607.1 

Boiler and Combustion Systems Hazards Code 631.1 

Chimneys, Fireplaces, Vents, and Solid Fuel-burning Appliances 503.5.2, 503.5.3, 503.5.6.1, 503.5.6.3 

Installation of Stationary Fuel Cell Power Systems 633.1 



UL 



Standard 
reference 




Referenced 
in code 


number 


Title 


section number 



103—2001 

127—99 
441—96 
641—95 
795—99 
959—01 
1738—00 

1777—04 



Underwriters Laboratories Inc. 
333 Pfingsten Road 
Northbrook, IL 60062 

Title 

Factory-built Chimneys, Residential Type and Building Heating Appliances - 

with Revisions through December 2003 506.1 

Factory-built Fireplaces^with Revisions through November 1999 621.7 

Gas Vents — with Revisions through December 1999 502.1 

Type L Low-temperature Venting Systems — with Revisions through April 1999 502.1 

Commercial-Industrial Gas Heating Equipment 610.1, 618.1, 631.1 

Medium Heat Apphance Factory-built Chimneys 506.3 

Venting Systems for Gas Burning Appliances, Categories II, III and IV with 

Revisions through December 2000 502. 1 

Standard for Chimney Liners 501.12, 501.15.4 



134 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX A (IFGS) 
SIZING AND CAPACITIES OF GAS PIPING 



(This appendix is informative and is not part of the code.) 



A.l General piping considerations. The first goal of deter- 
mining the pipe sizing for a fuel gas piping system is to make 
sure that there is sufficient gas pressure at the inlet to each 
appliance. The majority of systems are residential and the 
appliances will all have the same, or nearly the same, require- 
ment for minimum gas pressure at the appliance inlet. This 
pressure will be about 5-inch water column (w.c.) (1.25 kPa), 
which is enough for proper operation of the appliance regulator 
to deliver about 3.5-inches water column (w.c.) (875 kPa) to the 
burner itself. The pressure drop in the piping is subtracted from 
the source delivery pressure to verify that the minimum is avail- 
able at the appliance. 

There are other systems, however, where the required inlet 
pressure to the different appliances may be quite varied. In such 
cases, the greatest inlet pressure required must be satisfied, as 
well as the farthest appliance, which is almost always the criti- 
cal appliance in small systems. 

There is an additional requirement to be observed besides 
the capacity of the system at 100-percent flow. That require- 
ment is that at minimum flow, the pressure at the inlet to any 
apphance does not exceed the pressure rating of the appliance 
regulator. This would seldom be of concern in small systems if 
the source pressure is V2 psi (14-inch w.c.) (3.5 kPa) or less but 
it should be verified for systems with greater gas pressure at the 
point of supply. 

To determine the size of piping used in a gas piping system, 
the following factors must be considered: 

(1) Allowable loss in pressure from point of dehvery to 
equipment. 

(2) Maximum gas demand. 

(3) Length of piping and number of fittings. 

(4) Specific gravity of the gas. 

(5) Diversity factor. 

For any gas piping system, or special appliance, or for condi- 
tions other than those covered by the tables provided in this 
code, such as longer runs, greater gas demands or greater pres- 
sure drops, the size of each gas piping system should be deter- 
mined by standard engineering practices acceptable to the code 
official. 

A.2 Description of tables. 

A.2.1 General. The quantity of gas to be provided at each out- 
let should be determined, whenever possible, directly from the 
(manufacturer's gas input Btu/h rating of the appliance that will 
be installed. In case the ratings of the appliances to be installed 
are not known, Table 402.2 shows the approximate consump- 
tion (in Btu per hour) of certain types of typical household 
appliances. 



To obtain the cubic feet per hour of gas required, divide the 
total Btu/h input of all appliances by the average Btu heating | 
value per cubic feet of the gas. The average Btu per cubic feet of 
the gas in the area of the installation can be obtained from the 
serving gas supplier. 

A.2.2 Low pressure natural gas tables. Capacities for gas at 
low pressure [less than 2.0 psig (13.8 kPa gauge)] in cubic feet 
per hour of 0.60 specific gravity gas for different sizes and 
lengths are shown in Tables 402.4(1) and 402.4(2) for iron pipe 
or equivalent rigid pipe; in Tables 402.4(6) through 402.4(9) 
for smooth wall semirigid tubing; and in Tables 402.4(13) 
through 402.4(15) for corrugated stainless steel tubing. Tables 
402.4(1) and 402.4(6) are based upon a pressure drop of 
0.3-inch w.c. (75 Pa), whereas Tables 402.4(2), 402.4(7) and 
402.4(13) arebaseduponapressuredropof 0.5-inch w.c. (125 
Pa). Tables 402.4(8), 402.4(9), 402.4(14) and 402.4(15) are 
special low-pressure applications based upon pressure drops 
greater than 0.5-inch w.c. (125 Pa). In using these tables, an 
allowance (in equivalent length of pipe) should be considered 
for any piping run with four or more fittings (see Table A.2.2). 

A.2.3 Undiluted liquefied petroleum tables. Capacities in 
thousands of Btu per hour of undiluted liquefied petroleum 
gases based on a pressure drop of 0.5-inch w.c. (125 Pa) for dif- 
ferent sizes and lengths are shown in Table 402.4(26) for iron 
pipe or equivalent rigid pipe, in Table 402.4(28) for smooth 
wall semi-rigid tubing, in Table 402.4(30) for corrugated stain- 
less steel tubing, and in Tables 402.4(33) and 402.4(35) for 
polyethylene plastic pipe and tubing. Tables 402.4(31) and 
402.4(32) for corrugated stainless steel tubing and Table 
402.4(34) for polyethylene plastic pipe are based on operating 
pressures greater than 0.5 pounds per square inch (psi) (3.5 
kPa) and pressure drops greater than 0.5-inch w.c. (125 Pa). In 
using these tables, an allowance (in equivalent length of pipe) 
should be considered for any piping run with four or more fit- 
tings [see Table A.2.2]. 

A.2.4 Natural gas specific gravity. Gas piping systems that 
are to be supplied with gas of a specific gravity of 0.70 or less 
can be sized directly from the tables provided in this code, 
unless the code official specifies that a gravity factor be 
applied. Where the specific gravity of the gas is greater than 
0.70, the gravity factor should be applied. 

Application of the gravity factor converts the figures given in 
the tables provided in this code to capacities for another gas of 
different specific gravity. Such application is accompUshed by 
multiplying the capacities given in the tables by the multiphers 
shown in Table A.2.4. In case the exact specific gravity does 
not appear in the table, choose the next higher value specific 
gravity shown. 



2006 INTERNATIONAL FUEL GAS CODE® 



135 



APPENDIX A 



TABLE A.2.2 
EQUIVALENT LENGTHS OF PIPE FITTINGS AND VALVES 







SCREWED FITTINGS^ 


90° WELDING ELBOWS AND SIVIOOTH BENDS^ 




457EII 


90°/Eli 


180° close 
return bends 


Tee 


R/d=^ 


^vd=^^l^ 


fVd=2 


R/d=A 


R/cl=6 


R/d=Q 


/r factor = 


0.42 


0.90 


2.00 


1.80 


0.48 


0.36 


Q21 


0.21 


0.27 


0.36 


t/d' ratio* n = 


14 


30 


67 


60 


16 


12 


9 


7 


9 


12 


Nominal 

pipe size, 

Inches 


inside 
diameter d, 

inches, 
Schedule 40^ 


L = Equivalent Length In Feet of Schedule 40 (Standard-Weight) Straight Plpe^ 


V2 

1 

IV4 
IV2 


0.622 
0.824 
1.049 
1.380 
1.610 


0.73 
0.96 
1.22 
1.61 
1.88 


1.55 
2.06 
2.62 
3.45 
4.02 


3.47 
4.60 
5.82 
7.66 
8.95 


3.10 
4.12 
5.24 
6.90 
8.04 


0.83 
1.10 
1.40 
1.84 
2.14 


0.62 
0.82 
1.05 
1.38 
1.61 


0.47 
0.62 
0.79 
1.03 
1.21 


0.36 
0.48 
0.61 
0.81 
0.94 


0.47 
0.62 
0.79 
1.03 
1.21 


0.62 
0.82 
1.05 
1.38 
1.61 


2 

2V, 
3 
4 
5 


2.067 
2.469 
3.068 
4.026 
5.047 


2.41 
2.88 
3.58 
4.70 
5.88 


5.17 
6.16 
7.67 
10.1 
12.6 


11.5 
13.7 
17.1 

22.4 
28.0 


10.3 
12.3 
15.3 
20.2 

25.2 


2.76 
3.29 
4.09 

5.37 
6.72 


2.07 
2.47 
3.07 
4.03 
5.05 


1.55 
1.85 
2.30 
3.02 
3.78 


1.21 
1.44 
1.79 
2.35 
2.94 


1.55 
1.85 
2.30 
3.02 
3.78 


2.07 
2.47 
3.07 
4.03 
5.05 


6 

8 

10 
12 
14 


6.065 
7.981 
10.02 
11.94 
13.13 


7.07 
9.31 
11.7 
13.9 
15.3 


15.2 
20.0 
25.0 
29.8 
32.8 


33.8 
44.6 
55.7 
66.3 
73.0 


30.4 
40.0 
50.0 
59.6 
65.6 


8.09 
10.6 
13.3 
15.9 

17.5 


6.07 
7.98 
10.0 
11.9 
13.1 


4.55 
5.98 
7.51 
8.95 
9.85 


3.54 
4.65 
5.85 
6.96 

7.65 


4.55 
5.98 
7.51 
8.95 
9.85 


6.07 
7.98 
10.0 
11.9 
13.1 


16 
18 
20 

24 


15.00 
16.88 
18.81 
22.63 


17.5 
19.7 
22.0 
26.4 


37.5 
42.1 
47.0 
56.6 


83.5 
93.8 
105.0 
126.0 


75.0 
84.2 
94.0 
113.0 


20.0 

22.5 
25.1 
30.2 


15.0 
16.9 
18.8 
22.6 


11.2 
12.7 
14.1 
17.0 


8.75 
9.85 
11.0 
13.2 


11.2 
12.7 
14.1 
17.0 


15.0 
16.9 
18.8 
22.6 



continued 



136 



2006 INTERNATIONAL FUEL GAS CODE'' 



APPENDIX A 



TABLE A.2.2— continued 
EQUIVALENT LENGTHS OF PIPE FITTINGS AND VALVES 







IVIITER ELBOWS^ (No. of miters) 


WELDING TEES 


VALVES (screwed, flanged, or welded) 




1-45° 


1-60° 


1-90° 


2.9005 


3-90°5 


Forged 


Miter^ 


Gate 


Globe 


Angle 


Swing 
Check 


fr factor = 


0.45 


0.90 


1.80 


0.60 


0.45 


1.35 


1.80 


0.21 


10 


5.0 


2.5 


Ud' ratio* n = 


15 


30 


60 


20 


15 


45 


60 


7 


333 


167 


83 


Nominal 

pipe size, 

inches 


Inside 
diameter d, 

inches, 
Schedule 40^ 


L = Equivalent Length In Feet of Schedule 40 (Standard-Weight) Straight Pipe^ 


% 

1 

IV, 


0.622 
0.824 
1.049 
1.380 
1.610 


0.78 
1.03 
1.31 
1.72 
2.01 


1.55 
2.06 
2.62 
3.45 
4.02 


3.10 
4.12 
5.24 
6.90 
8.04 


1.04 
1.37 
1.75 
2.30 
2.68 


0.78 
1.03 
1.31 
1.72 
2.01 


2.33 
3.09 
3.93 
5.17 
6.04 


3.10 
4.12 
5.24 
6.90 
8.04 


0.36 
0.48 
0.61 
0.81 
0.94 


17.3 
22.9 
29.1 
38.3 
44.7 


8.65 
11.4 
14.6 
19.1 

22.4 


4.32 
5.72 
7.27 
9.58 
11.2 


2 

2% 
3 
4 
5 


2.067 
2.469 
3.068 
4.026 
5.047 


2.58 
3.08 
3.84 
5.04 
6.30 


5.17 
6.16 
7.67 
10.1 
12.6 


10.3 
12.3 
15.3 
20.2 

25.2 


3.45 
4.11 
5.11 
6.71 
8.40 


2.58 
3.08 
3.84 
5.04 
6.30 


7.75 
9.25 
11.5 
15.1 
18.9 


10.3 
12.3 
15.3 
20.2 

25.2 


1.21 
1.44 
1.79 
2.35 
2.94 


57.4 
68.5 
85.2 
112.0 
140.0 


28.7 
34.3 
42.6 
56.0 
70.0 


14.4 
17.1 
21.3 
28.0 
35.0 


6 
8 

10 
12 
14 


6.065 
7.981 
10.02 
11.94 
13.13 


7.58 
9.97 
12.5 
14.9 
16.4 


15.2 
20.0 
25.0 
29.8 
32.8 


30.4 
40.0 
50.0 
59.6 
65.6 


10.1 
13.3 
16.7 
19.9 
21.9 


7.58 
9.97 
12.5 
14.9 
16.4 


22.8 
29.9 
37.6 
44.8 
49.2 


30.4 
40.0 
50.0 
59.6 
65.6 


3.54 
4.65 
5.85 
6.96 
7.65 


168.0 
222.0 
278.0 
332.0 
364.0 


84.1 

111.0 

139.0 

166.0 

182.0 


42.1 
55.5 
69.5 
83.0 
91.0 


16 
18 
20 

24 


15.00 
16.88 
18.81 
22.63 


18.8 
21.1 
23.5 
28.3 


37.5 
42.1 
47.0 
56.6 


75.0 
84.2 
94.0 
113.0 


25.0 
28.1 
31.4 
37.8 


18.8 
21.1 

23.5 
28.3 


56.2 
63.2 
70.6 
85.0 


75.0 
84.2 
94.0 
113.0 


8.75 
9.85 
11.0 
13.2 


417.0 
469.0 
522.0 
629.0 


208.0 
234.0 
261.0 
314.0 


104.0 
117.0 
131.0 
157.0 



For SI: 1 foot = 305 mm, 1 degree = 0.01745 rad. 

Note: Values for welded fittings are for conditions where bore is not obstructed by weld spatter or backing rings. If appreciably obstructed, use values for "Screwed Fittings.' 

1. Flanged fittings have three-fourths the resistance of screwed elbows and tees. 

2. Tabular figures give the extra resistance due to curvature alone to which should be added the fuU length of travel. 

3. Small size socket- welding fittings are equivalent to miter elbows and miter tees. 

4. Equivalent resistance in number of diameters of straight pipe computed for a value of (f- 0.0075) from the relation (n - klAj). 

5. For condition of minimum resistance where the centerline length of each miter is between d and 'll2d. 

6. For pipe having other inside diameters, the equivalent resistance may be computed from the above n values. 

Source: Crocker, S . Piping Handbook, 4th ed. , Table XTV, pp. 100- 101 . Copyright 1 945 by McGraw-Hill, Inc. Used by permission of McGraw-Hill Book Company. 



2006 INTERNATIONAL FUEL GAS CODE*" 



137 



APPENDIX A 



TABLE A.2.4 

MULTIPLIERS TO BE USED WITH TABLES 402.4(1) 

THROUGH 402.4(21) WHERE THE SPECIFIC GRAVITY 

OF THE GAS IS OTHER THAN 0.60 



SPECIFIC 
GRAVITY 


MULTIPLIER 


SPECIFIC 
GRAVITY 


MULTIPLIER 


.35 


1.31 


1.00 


.78 


.40 


1.23 


1.10 


.74 


.45 


1.16 


L20 


.71 


.50 


1.10 


1.30 


.68 


.55 


1.04 


1.40 


.66 


.60 


1.00 


1.50 


.63 


.65 


.96 


1.60 


.61 


.70 


.93 


1.70 


.59 


.75 


.90 


1.80 


.58 


.80 


.87 


1.90 


.56 


.85 


.84 


2.00 


.55 


.90 


.82 


2.10 


.54 



A.2.5 Higher pressure natural gas tables. Capacities for gas 
at pressures 2.0 psig (13.8 kPa) or greater in cubic feet per hour 
of 0.60 specific gravity gas for different sizes and lengths are 
shown in Tables 402.4(3) through 402.4(5) for iron pipe or 
equivalent rigid pipe; Tables 402.4(10) to 402.4(12) for 
semirigid tubing; Tables 402.4(16) and 402.4(17) for corru- 
I gated stainless steel tubing; and Table 402.4(20) for polyethyl- 
ene plastic pipe. 

A.3 Use of capacity tables. 

A.3.1 Longest length method. This sizing method is conser- 
vative in its approach by applying the maximum operating con- 
ditions in the system as the norm for the system and by setting 
the length of pipe used to size any given part of the piping sys- 
tem to the maximum value. 

To determine the size of each section of gas piping in a sys- 
tem within the range of the capacity tables, proceed as follows 
(also see sample calculations included in this Appendix): 

(1) Divide the piping system into appropriate segments 
consistent with the presence of tees, branch lines and 
main runs. For each segment, determine the gas load 
(assuming all appliances operate simultaneously) and 
its overall length. An allowance (in equivalent length of 
pipe) as determined from Table A.2.2 shall be consid- 
ered for piping segments that include four or more fit- 
tings. 

(2) Determine the gas demand of each appliance to be 
attached to the piping system. Where Tables 402.4(1) 
through 402.4(22) are to be used to select the piping 
size, calculate the gas demand in terms of cubic feet per 
hour for each piping system outlet. Where Tables 
402.4(23) through 402.4(35) are to be used to select the 
piping size, calculate the gas demand in terms of thou- 
sands of Btu per hour for each piping system outlet. 

(3) Where the piping system is for use with other than undi- 
luted liquefied petroleum gases, determine the design 



system pressure, the allowable loss in pressure (pres- 
sure drop), and specific gravity of the gas to be used in 
the piping system. 

(4) Determine the length of piping from the point of deliv- 
ery to the most remote outlet in the building/piping sys- 
tem. 

(5) In the appropriate capacity table, select the row show- 
ing the measured length or the next longer length if the 
table does not give the exact length. This is the only 
length used in determining the size of any section of gas 
piping. If the gravity factor is to be applied, the values 
in the selected row of the table are multipUed by the 
appropriate multiplier from Table A.2.4. 

(6) Use this horizontal row to locate ALL gas demand fig- 
ures for this particular system of piping. 

(7) Starting at the most remote outlet, find the gas demand 
for that outlet in the horizontal row just selected. If the 
exact figure of demand is not shown, choose the next 
larger figure left in the row. 

(8) Opposite this demand figure, in the first row at the top, 
the correct size of gas piping will be found. 

(9) Proceed in a similar manner for each outlet and each 
section of gas piping. For each section of piping, deter- 
mine the total gas demand supplied by that section. 

When a large number of piping components (such as elbows, 
tees and valves) are installed in a pipe run, additional pressure 
loss can be accounted for by the use of equivalent lengths. Pres- 
sure loss across any piping component can be equated to the 
pressure drop through a length of pipe. The equivalent length of 
a combination of only four elbows/tees can result in a jump to 
the next larger length row, resulting in a significant reduction in 
capacity. The equivalent lengths in feet shown in Table A.2.2 
have been computed on a basis that the inside diameter corre- 
sponds to that of Schedule 40 (standard-weight) steel pipe, 
which is close enough for most purposes involving other 
schedules of pipe. Where a more specific solution for equiva- 
lent length is desired, this may be made by multiplying the 
actual inside diameter of the pipe in inches by n/12, or the 
actual inside diameter in feet by n (n can be read from the table 
heading). The equivalent length values can be used with rea- 
sonable accuracy for copper or brass fittings and bends 
although the resistance per foot of copper or brass pipe is less 
than that of steel. For copper or brass valves, however, the 
equivalent length of pipe should be taken as 45 percent longer 
than the values in the table, which are for steel pipe. 

A.3.2 Branch length method. This sizing method reduces the 
amount of conservatism built into the traditional Longest 
Length Method. The longest length as measured from the 
meter to the furthest remote appliance is only used to size the 
initial parts of the overall piping system. The Branch Length 
Method is applied in the following manner: 

( 1 ) Determine the gas load for each of the connected appli- 
ances. 

(2) Starting from the meter, divide the piping system into a 
number of connected segments, and determine the 
length and amount of gas that each segment would 
carry assuming that all appliances were operated simul- 



138 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX A 



taneously . An allowance (in equivalent length of pipe) 
as determined from Table A.2.2 should be considered 
for piping segments that include four or more fittings. 

(3) Determine the distance from the outlet of the gas meter 
to the appliance furthest removed from the meter. 

(4) Using the longest distance (found in Step 3), size each 
piping segment from the meter to the most remote 
appliance outlet. 

(5) For each of these piping segments, use the longest 
length and the calculated gas load for all of the con- 
nected appliances for the segment and begin the sizing 
process in Steps 6 through 8. 

(6) Referring to the appropriate sizing table (based on 
operating conditions and piping material), find the lon- 
gest length distance in the first column or the next 
larger distance if the exact distance is not listed. The use 
of alternative operating pressures and/or pressure 
drops will require the use of a different sizing table, but 
will not alter the sizing methodology. In many cases, 
the use of alternative operating pressures and/or pres- 
sure drops will require the approval of both the code 
official and the local gas serving utility. 

(7) Trace across this row until the gas load is found or the 
closest larger capacity if the exact capacity is not listed. 

(8) Read up the table column and select the appropriate 
pipe size in the top row. Repeat Steps 6, 7 and 8 for each 
pipe segment in the longest run. 

(9) Size each remaining section of branch piping not previ- 
ously sized by measuring the distance from the gas 
meter location to the most remote outlet in that branch, 
using the gas load of attached appliances and following 
the procedures of Steps 2 through 8. 

A.3.3 Hybrid pressure method. The sizing of a 2 psi (13.8 
kPa) gas piping system is performed using the traditional Lon- 
gest Length Method but with modifications. The 2 psi (13.8 
kPa) system consists of two independent pressure zones, and 
each zone is sized separately. The Hybrid Pressure Method is 
applied as follows: 

The sizing of the 2 psi (13.8 kPa) section (from the meter to 
the line regulator) is as follows: 

( 1 ) Calculate the gas load (by adding up the name plate rat- 
ings) from all connected appUances. (In certain circum- 
stances the installed gas load may be increased up to 50 
percent to accommodate future addition of appliances.) 
Ensure that the line regulator capacity is adequate for 
the calculated gas load and that the required pressure 
drop (across the regulator) for that capacity does not 
exceed V4 psi (5.2 kPa) for a 2 psi (13.8 kPa) system. If 
the pressure drop across the regulator is too high (for 
the coimected gas load), select a larger regulator. 

(2) Measure the distance from the meter to the line regula- 
tor located inside the building. 

(3) If there are multiple line regulators, measure the dis- 
tance from the meter to the regulator furthest removed 
from the meter. 



(4) The maximum allowable pressure drop for the 2 psi 
(13.8 kPa) section is 1 psi (6.9 kPa). 

(5) Referring to the appropriate sizing table (based on pip- 
ing material) for 2 psi (13.8 kPa) systems with a 1 psi 
(6.9 kPa) pressure drop, find this distance in the first 
column, or the closest larger distance if the exact dis- 
tance is not listed. 

(6) Trace across this row until the gas load is found or the 
closest larger capacity if the exact capacity is not listed. 

(7) Read up the table column to the top row and select the 
appropriate pipe size. 

(8) If there are multiple regulators in this portion of the pip- 
ing system, each line segment must be sized for its 
actual gas load, but using the longest length previously 
determined above. 

The low pressure section (all piping downstream of the line 
regulator) is sized as follows: 

( 1 ) Determine the gas load for each of the connected appli- 
ances. 

(2) Starting from the line regulator, divide the piping sys- 
tem into a number of connected segments and/or inde- 
pendent parallel piping segments, and determine the 
amount of gas that each segment would carry assuming 
that all appliances were operated simultaneously. An 
allowance (in equivalent length of pipe) as determined 
from Table A.2.2 should be considered for piping seg- 
ments that include four or more fittings. 

(3) For each piping segment, use the actual length or lon- 
gest length (if there are sub-branchlines) and the calcu- 
lated gas load for that segment and begin the sizing 
process as follows: 

(a) Referring to the appropriate sizing table (based 
on operating pressure and piping material), find 
the longest length distance in the first column or 
the closest larger distance if the exact distance is 
not listed. The use of alternative operating pres- 
sures and/or pressure drops will require the use 
of a different sizing table, but will not alter the 
sizing methodology. In many cases, the use of 
alternative operating pressures and/or pressure 
drops may require the approval of the code offi- 
cial. 

(b) Trace across this row until the apphance gas load 
is found or the closest larger capacity if the exact 
capacity is not listed. 

(c) Read up the table column to the top row and 
select the appropriate pipe size. 

(d) Repeat this process for each segment of the pip- 
ing system. 

A.3.4 Pressure drop per 100 feet method. This sizing method 
is less conservative than the others, but it allows the designer to 
immediately see where the largest pressure drop occurs in the 
system. With this information, modifications can be made to 
bring the total drop to the critical appliance within the limita- 
tions that are presented to the designer. 



2006 INTERNATIONAL FUEL GAS CODE® 



139 



APPENDIX A 



Follow the procedures described in the Longest Length 
Method for Steps (1) through (4) and (9). 

For each piping segment, calculate the pressure drop based 
on pipe size, length as a percentage of 100 feet (30 480 mm), 
and gas flow. Table A. 3. 4 shows pressure drop per 100 feet (30 
480 mm) for pipe sizes from Vj inch (12.7 mm) through 2 inch 
(5 1 mm). The sum of pressure drops to the critical appliance is 
subtracted from the supply pressure to verify that sufficient 
pressure will be available. If not, the layout can be examined to 
find the high drop section(s) and sizing selections modified. 

Note: Other values can be obtained by using the following 
equation: 



Desired Value = MBH x 



Desired Drop 
Table Drop 



For example, if it is desired to get flow through V4-inch (19.1 
mm) pipe at 2 inches/100 feet, multiple the capacity of V4-inch 
pipe at 1 inch/1 00 feet by the square root of the pressure ratio: 



147 MBH X jl^!^ = 147 x 1.414 = 20S MBH 
V'w.c. 



(MBH = 1000 Bm/h) 

A.4 Use of sizing equations. Capacities of smooth wall pipe or 
tubing can also be determined by using the following formulae: 

(1) High Pressure [1.5 psi (10.3 kPa) and above]: 



2=181.6. 



=2231 D' 



D 



C, fba-L 



(p'-pO-y 



C-L 



Q =187.3. 



=2313Z)' 



where: 



D' AH 

C^- fba-L 



/ N 0.541 

^ AH 



yCrL 



(2) Low Pressure [Less than 1.5 psi (10.3 kPa)]: 



Q = Rate, cubic feet per hour at 60°F and 30-inch mercury 
column 

D = Inside diameter of pipe, in. 

Pi = Upstream pressure, psia 

P2 = Downstream pressure, psia 

Y = Superexpansibihty factor = 1/supercompressibility fac- 
tor 

Cr = Factor for viscosity, density and temperature* 



= 0.00354 571- 
S 



Note: See Table 402.4 for Fand C, for natural gas and 
propane. 

S = Specific gravity of gas at 60°F and 30-inch mercury 
column (0.60 for natural gas, 1.50 for propane), or = 
1488|i 

T = Absolute temperature, °F or = r -»- 460 

t = Temperature, °F 

Z = Viscosity of gas, centipoise (0.012 for natural gas, 
0.008 for propane), or = 1488|i 

Jba = Base friction factor for air at 60°F (CF=1) 

L = Length of pipe, ft 

AH = Pressure drop, in. w.c. (27.7 in. HjO = 1 psi) 

(For SI, see Section 402.4) 

A.5 Pipe and tube diameters. Where the internal diameter is 
determined by the formulas in Section 402.4, Tables A.5.1 and 
A.5. 2 can be used to select the nominal or standard pipe size 
based on the calculated internal diameter. 



TABLE A.3.4 

THOUSANDS OF Btu/h (MBH) OF NATURAL GAS PER 100 FEET OF PIPE AT 

VARIOUS PRESSURE DROPS AND PIPE DIAMETERS 



PRESSURE DROP PER 

100 FEET IN INCHES 

W.C. 


PIPE SIZES (inch) 


% 


% 


1 


vu 


IV2 


2 


0.2 


31 


64 


121 


248 


372 


716 


0.3 


38 


79 


148 


304 


455 


877 


0.5 


50 


104 


195 


400 


600 


1160 


LO 


71 


147 


276 


566 


848 


1640 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm. 



140 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX A 



TABLE A.5.1 
SCHEDULE 40 STEEL PIPE STANDARD SIZES 



NOMINAL SIZE 
(in.) 


INTERNAL 

DIAMblbR 

(in.) 


NOMINAL 
SIZE 
(in.) 


INTERNAL 

DIAMblER 

(in.) 


\ 


0.364 


IV. 


1.610 


v« 


0.493 


2 


2.067 


V, 


0.622 


2V, 


2.469 


'U 


0.824 


3 


3.068 


1 


1.049 


3V, 


3.548 


IV. 


1.380 


4 


4.026 



For SI: 1 inch = 25.4 mm. 

A.6 Use of sizing charts. A third method of sizing gas piping is 
detailed below as an option that is useful when large quantities 
of piping are involved in a job (e.g., an apartment house) and 
material costs are of concern. If the user is not completely 
familiar with this method, the resulting pipe sizing should be 
checked by a knowledgeable gas engineer. The sizing charts 
are applied as follows: 

(1) With the layout developed according to Section 
106.3.1 of the code, indicate in each section the design 
gas flow under maximum operation conditions. For 
many layouts, the maximum design flow will be the 
sum of all connected loads; However, in some cases, 
certain combinations of appliances will not occur 
simultaneously (e.g., gas heating and air conditioning). 
For these cases, the design flow is the greatest gas flow 
that can occur at any one time. 

(2) Determine the inlet gas pressure for the system being 
designed. In most cases, the point of inlet will be the gas 
meter or service regulator, but in the case of a system 
addition, it could be the point of connection to the exist- 
ing system. 

(3) Determine the minimum pressure required at the inlet 
to the critical appliance. Usually, the critical item will 
be the appliance with the highest required pressure for 
satisfactory operation. If several items have the same 
required pressure, it will be the one with the greatest 
length of piping from the system inlet. 

(4) The difference between the inlet pressure and critical 
item pressure is the allowable system pressure drop. 
Figures A.6(a) and A.6(b) show the relationship 
between gas flow, pipe size and pipe length for natural 
gas with 0.60 specific gravity. 

(5) To use Figure A.6(a) (low pressure applications), cal- 
culate the piping length from the inlet to the critical 
appliance. Increase this length by 50 percent to allow 
for fittings. Divide the allowable pressure drop by the 
equivalent length (in hundreds of feet) to determine the 
allowable pressure drop per 100 feet (30 480 mm). 
Select the pipe size from Figure A.6(a) for the required 
volume of flow. 

(6) To use Figure A.6(b) (high pressure applications), cal- 
culate the equivalent length as above. Calculate the 



index number for Figure A.6(b) by dividing the differ- 
ence between the squares of the absolute values of inlet 
and outlet pressures by the equivalent length (in hun- 
dreds of feet). Select the pipe size from Figure A.6(b) 
for the gas volume required. 

TABLE A.5.2 
COPPER TUBE STANDARD SIZES 



TUBE TYPE 


NOMINAL OR 

STANDARD SIZE 

(inches) 


INTERNAL DIAMETER 
(inches) 


K 


\ 


0.305 


L 


% 


0.315 


ACR (D) 


\ 


0.315 


ACR (A) 


% 


0.311 


K 


% 


0.402 


L 


\ 


0.430 


ACR (D) 


\ 


0.430 


ACR (A) 


\ 


0.436 


K 


% 


0.527 


L 


\ 


0.545 


ACR (D) 


\ 


0.545 


ACR (A) 


\ 


0.555 


K 


% 


0.652 


L 


% 


0.666 


ACR (D) 


'u 


0.666 


ACR (A) 


% 


0.680 


K 


\ 


0.745 


L 


\ 


0.785 


ACR 


y. 


0.785 


K 


1 


0.995 


L 


1 


1.025 


ACR 


iVs 


1.025 


K 


1V4 


1.245 


L 


IV. 


1.265 


ACR 


1% 


1.265 


K 


IV. 


1.481 


L 


1V2 


1.505 


ACR 


l\ 


1.505 


K 


2 


1.959 


L 


2 


1.985 


ACR 


2V« 


1.985 


K 


2% 


2.435 


L 


2\ 


2.465 


ACR 


2% 


2.465 


K 


3 


2.907 


L 


3 


2.945 


ACR 


3V« 


2.945 



For SI: 1 inch = 25.4 mm. 



2006 INTERNATIONAL FUEL GAS CODE® 



141 



APPENDIX A 



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80 


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)0 


4( 


30 


6( 


)0 


80C 


Li 000 2000 


4000 


6000 


10,( 



FIGURE A.6 (a) 
CAPACITY OF NATURAL GAS PIPING, LOW PRESSURE (0.60 WC) 



Index number = 4 

pZ.pZ 

IL-Li- (100) 
Dist. 



Dist. = Eq. length, ft 

Pi = Initial press, abs. psi 

P2 = Final press, abs. psi 











%" 






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° 11/2" 




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FIGURE A.6 (b) 
CAPACITY OF NATURAL GAS PIPING, HIGH PRESSURE (1.5 psi and above) 



142 



2006 INTERNATIONAL FUEL GAS CODE"" 



APPENDIX A 



A.7 Examples of piping system design and sizing 

A.7.1 Example 1: Longest length method. Determine the 
required pipe size of each section and outlet of the piping sys- 
tem shown in Figure A.7. 1, with a designated pressure drop of 
0.5-inch w.c. (125 Pa) using the Longest Length Method. The 
gas to be used has 0.60 specific gravity and a heating value of 
1,000 Btu/ft3 (37.5 MJ/m3). 

Solution: 

(1) Maximum gas demand for Outlet A: 
Consumption (rating plate input, or Table 402.2 if necessary) 
Btu of gas 

35,000 Btu per hour rating ^^ . ^ , ^^ „ 

= 35 cubic feet per hour = 35cfh 

1,000 Btu per cubic foot 

Maximum gas demand for Outlet B: 
Consumption _ 75,000 _ ^^ „ 
Btu of gas 1,000 

Maximum gas demand for Outlet C: 

Consumption 35,000 ^^ „ 

= — = 35 cfh 

Btu of gas 1,000 

Maximum gas demand for Outlet D: 
Consumption 100,000 



Btu of gas 



1,000 



= 100 cfh 



(2) The length of pipe from the point of delivery to the 
most remote outlet (A) is 60 feet (18 288 mm). This 
is the only distance used. 

(3) Using the row marked 60 feet ( 1 8 288 mm) in Table 
402.4(2): 

(a) Outlet A, supplying 35 cfh (0.99 m^/hr), 
requires Vj-inch pipe. 

(b) Outlet B, supplying 75 cfh (2.12 m^/hr), 
requires V4-inch pipe. 

(c) Section 1, supplying Outlets A and B, or 1 10 
cfh (3.1 1 m^/hr), requires V4-inch pipe. 

(d) Section 2, supplying Outlets C and D, or 135 
cfh (3.82 m^/hr), requires V4-inch pipe. 

(e) Section 3, supplying Outlets A, B, C and D, or 
245 cfh (6.94 m^/hr), requires 1-inch pipe. 

(4) If a different gravity factor is applied to this exam- 
ple, the values in the row marked 60 feet (18 288 
mm) of Table 402.4(2) would be multiplied by the 
appropriate multiplier from Table A.2.4 and the 
resulting cubic feet per hour values would be used to 
size the piping. 

A.7.2 Example 2: Hybrid or dual pressure systems. Deter- 
mine the required CSST size of each section of the piping sys- 
tem shown in Figure A.7.2, with a designated pressure drop of 
1 psi (6.9 kPa) for the 2 psi (13.8 kPa) section and 3-inch w.c. 
(0.75 kPa) pressure drop for the 13-inch w.c. (2.49 kPa) sec- 
tion. The gas to be used has 0.60 specific gravity and a heating 
value of 1,000 Btu/ft^ (37.5 MJ/ m^). 



Outlet C •— 

40 gal. automatic 
water heater 
351000 Btu/h 



Sections 
»■ 



20 ft 



10fl 



Outlet D 
furnace 
100 poo Btu/h 



V Section 2 
-^20 ft 



Section 1 
10ft 



15fl 



I Point of 
delivery 



} 



5 ft 



M5ft 



Outlet A 
clothes dryer 
35 poo Btu/h 



Outlet B i 
range/oven unit 
75 poo Btu/h 

FIGURE A.7.1 
PIPING PLAN SHOWING A STEEL PIPING SYSTEM 



Solution: 

(1) Size 2 psi (13.8 kPa) line using Table 402.4(16). 

(2) Size 10-inch w.c. (2.5 kPa) lines using Table 
402.4(14). 

(3) Using the following, determine if sizing tables can be 
used. 

(a) Total gas load shown in Figure A.7.2 equals 110 
cfh (3.11 m^/hr). 

(b) Determine pressure drop across regulator [see 
notes in Table 402.4 (16)]. 

(c) If pressure drop across regulator exceeds V4 psig 
(5.2 kPa), Table 402.4 (16) cannot be used. Note: 
If pressure drop exceeds V4 psi (5.2 kPa), then a 
larger regulator must be selected or an alternative 
sizing method must be used. 

(d) Pressure drop across the line regulator [for 110 
cfh (3.11 m^/hr)] is 4-inch w.c. (0.99 kPa) based 
on manufacturer's performance data. 

(e) Assume the CSST manufacturer has tubing sizes 
orEHDsof 13, 18,23and30. 

(4) Section A [2 psi (13.8 kPa) zone] 

(a) Distance from meter to regulator =100 feet (30 
480 mm). 

(b) Total load supphed by A = 1 10 cfh (3.1 1 m^/hr) 
(furnace + water heater -1- dryer). 

(c) Table 402.4 (16) shows that EHD size 18 should 
be used. 

Note: It is not unusual to oversize the supply Une 
by 25 to 50 percent of the as-installed load. EHD 
size 18 has a capacity of 189 cfh (5.35 m^/hr). 

(5) Section B (low pressure zone) 

(a) Distance from regulator to furnace is 15 feet (4572 
mm). 



2006 INTERNATIONAL FUEL GAS CODE® 



143 



APPENDIX A 



(b) Loadis60cfh(1.70m3/hr). 

(c) Table 402.4 (14) shows that EHD size 13 should 
be used. 

(6) Section C (low pressure zone) 

(a) Distance from regulator to water heater is 10 
feet (3048 mm). 

(b) Load is 30 cfh (0.85 m^/hr). 

(c) Table 402.4 (14) shows that EHD size 13 should 
be used. 

(7) Section D (low pressure zone) 

(a) Distance from regulator to dryer is 25 feet (7620 
mm). 

(b) Load is 20 cfh (0.57 m^/hr). 

(c) Table 402.4(14) shows that EHD size 13 should 
be used. 




Key: 

Manifold 
X Shut-off valve 
y<j Pressure regulator 
M Gas meter 

FIGURE A.7.2 
PIPING PLAN SHOWING A CSST SYSTEM 



(3) 



(4) 



(5) 



(b) Use this branch length to size Section B only. 

(c) Using the row marked 30 feet (9144 mm) in 
Table 402.4(8), Section B, supplying 75 cfh 
(2.12 m^/hr) for the range/oven requires V2-inch 
tubing. 

Section C 

(a) The length of tubing from the point of delivery to 
the dryer at the end of Section C is 50 feet ( 1 5 240 
mm), A + C. 

(b) Use this branch length (which is also the longest 
length) to size Section C. 

(c) Using the row marked 50 feet (15 240 mm) in 
Table 402.4(8), Section C, supplying 30 cfh 
(0.85 m^/hr) for the dryer requires Vg-inch tubing. 

Section D 

(a) The length of tubing from the point of delivery to 
the water heater at the end of Section D is 30 feet 
(9144 mm), A + D. 

(b) Use this branch length to size Section D only. 

(c) Using the row marked 30 feet (9144 mm) in 
Table 402.4(8), Section D, supplying 35 cfh 
(0.99 m^/hr) for the water heater requires Vg-inch 
tubing. 

Section E 

(a) The length of tubing from the point of delivery to 
the furnace at the end of Section E is 30 feet 
(9144 mm), A + E. 

(b) Use this branch length to size Section E only. 

(c) Using the row marked 30 feet (9144 mm) in 
Table 402.4(8), Section E, supplying 80 cfh 
(2.26 m^/hr) for the furnace requires V2-inch tub- 
ing. 



A.7.3 Example 3: Branch length method. Determine the 
required semirigid copper tubing size of each section of the 
piping system shown in Figure A.7.3, with a designated pres- 
sure drop of 1-inch w.c. (250 Pa) (using the Branch Length 
Method). The gas to be used has 0.60 specific gravity and a 
heating value of 1,000 Btu/ft^ (37.5 MJ/m^). 

Solution: 

(1) Section A 

(a) The length of tubing from the point of delivery to 
the most remote appliance is 50 feet (15 240 
mm), A + C. 

(b) Use this longest length to size Sections A and C. 

(c) Using the row marked 50 feet (15 240 mm) in 
Table 402.4(8), Section A, supplying 220 cfh 
(6.2 m^/hr) for four appliances requires 1-inch 
tubing. 

(2) Section B 

(a) The length of tubing from the point of delivery to 
the range/oven at the end of Section B is 30 feet 
(9144 mm), A + B. 



oo 
oo 

Section B ^ 

Section A J N Section D 
220 Cfh ^^ >~^Wate 

Section E ^^ ) heate 



ool Range/oven 
°o 75 cfh 



Section C 



Water 
heater 
35 cfh 



Furnace 
80 cfh 



D 

Dryer 
30 cfh 



Length of runs: 
A = 20 ft 
B=10ft 
C = 30ft 
D = 10ft 
E=10ft 



Key: 

Ufa Manifold 

X Shut-off valve 

[m] Gas meter 
Total gas load = 220 cfh 



FIGURE A.7.3 
PIPING PLAN SHOWING A COPPER TUBING SYSTEM 

A.7.4 Example 4: Modifiication to existing piping system. 

Determine the required CSST size for Section G (retrofit appli- 
cation) of the piping system shown in Figure A.7.4, with a des- 



144 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX A 



ignated pressure drop of 0.5-inch w.c. (125 Pa) using the 
branch length method. The gas to be used has 0.60 specific 
gravity and a heating value of 1,000 Btu/ft^ (37.5 MJ/m^). 

Solution: 

( 1 ) The length of pipe and CSST from the point of delivery 
to the retrofit appliance (barbecue) at the end of Section 
G is 40 feet (12 192 mm), A + B + G. 

(2) Use this branch length to size Section G. 

(3) Assume the CSST manufacturer has tubing sizes or 
EHDs of 13, 18, 23 and 30. 

(4) Using the row marked 40 feet (12 192 mm) in Table 
402.4(13), Section G, supplying 40 cfli (1.13 m^/hr) for 
the barbecue requires EHD 18 CSST. 

(5) The sizing of Sections A, B, F and E must be checked to 
ensure adequate gas carrying capacity since an appli- 
ance has been added to the piping system (see A.7. 1 for 
details). 



Barbecue 

40cfh 

fvl 



S 



Section A Section B ^ 



Section G 

Section C 



Section F 



Section E 



D 

Furnace 
80cfh 



Section D 



Range/oven 
75cfh 



Length of runs: 
A=15ft E = 5ft 
B=10ft F=10ft 
C = 15ft G = 15ft 
D = 20ft 



Key: 

X Shut-oft valve 

[m] Gas meter 



FIGURE A.7.4 

PIPING PLAN SHOWING A MODIFICATION 

TO EXISTING PIPING SYSTEM 



A.7.5 Example 5: Calculating pressure drops due to tem- 
perature changes. A test piping system is installed on a warm 
autumn afternoon when the temperature is 70°F (21°C). In 
accordance with local custom, the new piping system is sub- 
jected to an air pressure test at 20psig (138 kPa). Overnight, the 
temperature drops and when the inspector shows up first thing 
in the morning the temperature is 40°F (4°C). 

If the volume of the piping system is unchanged, then the 
formula based on Boyle's and Charles' law for determining the 
new pressure at a reduced temperature is as follows: 

T P 

_M__M_ 

T P 

where: 

Tj = Initial temperature, absolute (Tj + 459) 
T2 = Final temperature, absolute (T2 + 459) 
P, = Initial pressure, psia (Pj + 14.7) 



P2 = Final pressure, psia (P2 + 14.7) 
(70 + 459) _ (20 + 14.7) 
(40 + 459) ~ (P^ +14.7) 

529 34.7 



499 (P2 +14.7) 
529 



(P2 


+ 14.7) 


X : 

499 


(P2 


+14.7) 


_ 34.7 
1.060 


P2 


=32.7 - 


14.7 



= 34.7 



P2 =lSpsig 

Therefore, the gauge could be expected to register 18 psig 
(124 kPa) when the ambient temperature is 40 °F (4°C). 

A7.6 Example 6: Pressure drop per 100 feet of pipe method. 

Using the layout shown in Figure A.7. 1 and A//=pressure drop, 
in w.c. (27.7 in. H20=l psi), proceed as follows: 

(1) Length to A = 20 feet, with 35,000 Btu/hr. 

For V2-inch pipe, A//= ^ofeet/^^^^^^^ x 0.3 inch w.c. = 0.06 
in w.c. 

(2) Length to B = 15 feet, with 75,000 Btu/hr. 

For V4-inch pipe, AH=^^ ^'"'/mf.a x 0-3 inch w.c. = 0.045 
in w.c. 

(3) Section 1 = 10 feet, with 1 10,000 Btu/hr. Here there is a 
choice: 

For 1 inch pipe: AH= ^^^^^'/mk^t^ 0-2 inch w.c. = 0.02 in 
w.c. 

For ¥4-inch pipe: AH = 1° ^^Vioo feet x [0-5 inch w.c. + 

(110,000 Btu/hr-104,000 Btu/hr)/ ^ fi C\ inohf^Q 

'(147,000 Btu/hr-104,000 Btu/hr) ■'^ V^-'-' lUt^XlCi 

W.C. - 0.5 inch w.c.)] = 0.1 x 0.57 inch w.c.« 0.06 inch 
w.c. 

Note that the pressure drop between 104,000 Btu/hr 
and 147,000 Btu/hr has been interpolated as 110,000 
Btu/hr. 

(4) Section 2 = 20 feet, with 1 35 ,000 Btu/hr. Here there is a 
choice: 

For 1-inch pipe: AH = ^^ ^^^Vioo feet x [0.2 inch w.c. + 

(A14,000 Btu/hr)/^^^^^^^ ^^^ ^ ^0.1 iuch W.C.)] = 0.05 iuch 

w.c.)] 

For Vinch pipe: AH= ^ofcet/^^^^^^^ x 1.0 inch w.c. = 0.2 
inch w.c.) 

Note that the pressure drop between 121,000 Btu/hr 
and 148,000 Btu/hr has been interpolated as 135,000 
Btu/hr, but interpolation for the V4-inchpipe (trivial for 
104,000 Btu/hr to 147,000 Btu/hr) was not used. 

(5) Section 3 = 30 feet, with 245 ,000 Btu/hr. Here there is a 
choice: 

For 1-inch pipe: A// = ^ofe^ooj^^, x 1.0 inches w.c. = 0.3 
inch w.c. 



2006 INTERNATIONAL FUEL GAS CODE® 



145 



APPENDIX A 



For 1 V4-inch pipe: AH = ^o feet/^^ ^^^ ^ 0.2 inch w.c. = 
0.06 inch w.c. 

Note that interpolation for these options is ignored 
since the table values are close to the 245,000 Btu/hr 
carried by that section. 

(6) The total pressure drop is the sum of the section 
approaching A, Sections 1 and 3, or either of the fol- 
lowing, depending on whether an absolute minimum is 
needed or the larger drop can be accommodated. 

Minimum pressure drop to farthest appliance: 

A// = 0.06 inch w.c. + 0.02 inch w.c. + 0.06 inch w.c. = 
0.14 inch w.c. 

Larger pressure drop to the farthest appliance: 

AH = 0.06 inch w.c. + 0.06 inch w.c. + 0.3 inch w.c. = 
0.42 inch w.c. 

Notice that Section 2 and the run to B do not enter into 
this calculation, provided that the appliances have sim- 
ilar input pressure requirements. 

For SI units: 1 Btu/hr = 0.293 W, 1 cubic foot = 0.028 
m\ 1 foot = 0.305 m, 1 inch w.c. = 249 Pa. 



146 2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX B (IFGS) 

SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED 

WITH DRAFT HOODS, CATEGORY I APPLIANCES, AND 

APPLIANCES LISTED FOR USE WITH TYPE B VENTS 

(This appendix is informative and is not part of the code.) 



EXAMPLES USING SINGLE 
APPLIANCE VENTING TABLES 

Example 1: Single draft-hood-equipped appliance. 

An installer has a 120,000 British thermal unit (Btu) per hour 
input appliance with a 5-inch-diameter draft hood outlet that 
needs to be vented into a 10-foot-high Type B vent system. 
What size vent should be used assuming (a) a 5-foot lateral sin- 
gle-wall metal vent connector is used with two 90-degree 
elbows, or (b) a 5-foot lateral single-wall metal vent connector 
is used with three 90-degree elbows in the vent system? 

Solution: 

Table 504.2(2) should be used to solve this problem, because sin- 
gle-wall metal vent connectors are being used with a Type B vent. 

(a) Read down the first column in Table 504.2(2) until the 
row associated with a 10-foot height and 5 -foot lateral 
is found. Read across this row until a vent capacity 
greater than 120,000 Btu per hour is located in the 



shaded columns labeled "NAT Max" for draft-hood- 
equipped appliances. In this case, a 5-inch-diameter 
vent has a capacity of 122,000 Btu per hour and may be 
used for this application. 

(b) If three 90-degree elbows are used in the vent system, 
then the maximum vent capacity listed in the tables 
must be reduced by 10 percent (see Section 504.2.3 for 
single appliance vents). This implies that the 5-inch- 
diameter vent has an adjusted capacity of only 1 10,000 
Btu per hour. In this case, the vent system must be 
increased to 6 inches in diameter (see calculations 
below). 

122,000 (.90) = 110,000 for 5-inch vent 
From Table 504.2(2), Select 6-inch vent 
186,000 (.90) = 167,000; This is greater than the 
required 120,000. Therefore, use a 6-inch vent and 
connector where three elbows are used. 



VENT CAP— C 



TYPE B DOUBLE-WALL— 
GAS VENT 




:^ 



VENT CAP HI 



((=f 



^ 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 
Table 504.2(1) is used when sizing Type B double- wall gas vent connected 
directly to the appliance. 

Note: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-1 

TYPE B DOUBLE-WALL VENT SYSTEM SERVING A SINGLE 

APPLIANCE WITH A TYPE B DOUBLE-WALL VENT 



TYPE B DOUBLE-WALL— 
GAS VENT 



SINGLE-WALL VENT- 
CONNECTOR 




For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 IW 
Table 504.2(2) is used when sizing a single-wall metal vent connector 
attached to a Type B double-wall gas vent. 

Note: The appUance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-2 

TYPE B DOUBLE-WALL VENT SYSTEM SERVING 

A SINGLE APPLIANCE WITH A SINGLE-WALL 

METAL VENT CONNECTOR 



2006 INTERNATIONAL FUEL GAS CODE® 



147 



APPENDIX B 



TILE-LINED MASONRY- 
CHIMNEY 




TYPE B DOUBLE-WALL— 
GAS VENT USED AS 
CONNECTOR 



^ 



VENT CAP 



^ 



Table 504.2(3) is used when sizing a Type B double-wall gas vent connector 
attached to a tile-lined masonry chimney. 

Note: "A" is the equivalent cross-sectional area of the tile liner. 

Note: The apphance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-3 

VENT SYSTEM SERVING A SINGLE APPLIANCE 

WITH A MASONRY CHIMNEY OF TYPE B 

DOUBLE-WALL VENT CONNECTOR 




Asbestos cement Type B or single-wall metal vent serving a single draft-hood- 
equipped appliance [see Table 504.2(5)]. 

FIGURE B-5 

ASBESTOS CEMENT TYPE B OR SINGLE-WALL 

METAL VENT SYSTEM SERVING A SINGLE 

DRAFT-HOOD-EQUIPPED APPLIANCE 



TILE-LINED MASONRY- 
CHIMNEY 



SINGLE-WALL VENT- 
CONNECTOR 




a_B 



(f?r 



rr 



•— D 

—TYPE B DOUBLE-WALL 
COMMON VENT 



J— VENT CAP 



TYPE B DOUBLE-WALL 
GAS VENT USED AS 
CONNECTORS 




Table 504.2(4) is used when sizing a single-wall vent connector attached to a 
tile-Uned masonry chimney. 

Note: "A" is the equivalent cross-sectional area of the tile liner. 

Note: The appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-4 

VENT SYSTEM SERVING A SINGLE APPLIANCE 

USING A MASONRY CHIMNEY AND A 

SINGLE-WALL METAL VENT CONNECTOR 



Table 504.3(1) is used when sizing Type B double-wall vent connectors 
attached to a Type B double-wall common vent. 

Note: Each appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-6 

VENT SYSTEM SERVING TWO OR MORE APPLIANCES 

WITH TYPE B DOUBLE-WALL VENT AND TYPE B 

DOUBLE-WALL VENT CONNECTOR 



148 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX B 



-VENT CAP 



-TYPE B DOUBLE-WALL 
COMMON VENT 



TILE-LINED MASONRY 
CHIMNEY 





Table 504.3(2) is used when sizing single-wall vent connectors attached to a 
Type B double-wall common vent. 

Note: Each appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-7 

VENT SYSTEM SERVING TWO OR MORE APPLIANCES 

WITH TYPE B DOUBLE-WALL VENT AND 

SINGLE-WALL METAL VENT CONNECTORS 



Table 504.3(4) is used when sizing single-wall metal vent connectors attached 
to a tile-lined masonry chimney. 

Note: "A" is the equivalent cross-sectional area of the tile Uner. 

Note: Each appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-9 

MASONRY CHIMNEY SERVING TWO OR MORE APPLIANCES 

WITH SINGLE-WALL METAL VENT CONNECTORS 



TYPE B DOUBLE-WALL 
H GAS VENT USED AS 
CONNECTORS 



-- A 



(rr 



}— -VENT CAP 



-TILE-LINED MASONRY 
CHIMNEY 



3_: 



^ 



=^ 



CONNECTOR 
RISE "R" 



Table 504.3(3) is used when sizing Type B double-wall vent connectors 
attached to a tile-lined masonry chimney. 

Note: "A" is the equivalent cross-sectional area of the tile liner. 

Note: Each appliance may be either Category I draft hood equipped or fan- 
assisted type. 

FIGURE B-8 

MASONRY CHIMNEY SERVING TWO OR MORE APPLIANCES 

WITH TYPE B DOUBLE-WALL VENT CONNECTOR 




Asbestos cement Type B or single-wall metal pipe vent serving two or more 
draft-hood-equipped appliances [see Table 504.3(5)]. 

FIGURE B-10 

ASBESTOS CEMENT TYPE B OR SINGLE-WALL 

METAL VENT SYSTEM SERVING TWO OR MORE 

DRAFT-HOOD-EQUIPPED APPLIANCES 



2006 INTERNATIONAL FUEL GAS CODE'^ 



149 



APPENDIX B 




noi 



VENT CONNECTOR 



•AVAILABLE TOTAL HEIGHT 
■H" EQUALS RISE PLUS 
DISTANCE BETWEEN TEES 



MANIFOLD COMMON 
VENT CONNECTOR 




Example: Manifolded Common Vent Connector L,, shall be no greater than 18 
times the common vent connector manifold inside diameter; i.e., a 4-inch (102 
mm) inside diameter common vent connector manifold shall not exceed 72 
inches (1829 mm) in length (see Section 504.3.4). 

Note: This is an illustration of a typical manifolded vent connector. Different 
appliance, vent connector, or conunon vent types are possible. Consult Section 
502.3. 

FIGURE B-11 
USE OF MANIFOLD COMMON VENT CONNECTOR 



V777777777777/77/ 



Vent connector size depends on: 

• Input 

• Rise 

• Available total height "ff ' 
• Table 504.3(1) connectors 



Common vent size depends on: 

• Combined inputs 

• Available total height "//" 

• Table 504.3(1) common vent 



FIGURE B-13 

MULTISTORY GAS VENT DESIGN PROCEDURE 

FOR EACH SEGMENT OF SYSTEM 



VENT CAP 




Example: Offset Common Vent 

Note: This is an illustration of a typical offset vent. Different appliance, vent 
connector, or vent types are possible. Consult Sections 504.2 and 504.3. 

FIGURE B-12 
USE OF OFFSET COMMON VENT 



USE INDIVIDUAL 
VENT FOR 
TOP FLOOR 
APPLIANCE IF 
CONNECTOR 
REQUIREMENT FOR 
RISE OF TOTAL 
HEIGHT CANNOT 
BE MET 



AVAILABLE TOTAL 
HEIGHT FOR TOP 
FLOOR APPLIANCE 



CONNECTOR TABLE 



s. 



USE AVAILABLE TOTAL HEIGHT F( 
TOP FLOOR APPLIANCE AND 
COMBINE INPUT OF ALL APPLIAN 
ON COMMON VENT 



^y~ 



AVAILABLE TOTAL 
HEIGHT FOR 
THIRD-FLOOR 
. APPLIANCE 



CONNECTOR TABLE 



B. 



T=^a— 



AVAILABLE TOTAL 
HEIGHT FOR 
SECOND-FLOOR 
APPLIANCE 



CONNECTOR TABLE 



B. 



THIRD INTERCONNECTION TEE 

-AVAILABLE TOTAL HEIGHT AND 
THIRD-FLOOR APPLIANCE AND 
COMBINED INPUT OF THREE 
APPLIANCES (IF TOP FLOOR 
APPLIANCE IS NOT CONNECTE 
MEASURED TOTAL HEIGHTTO 
VENT TOP) 

-SECOND INTERCONNECTION T 



-USE AVAILABLE TOTAL HEIGHT 
SECOND-FLOOR APPLIANCE Al 
COMBINED HEAT INPUT OF TWi 
APPLIANCES 

-FIRST INTERCONNECTION TEE 



DESIGN VENT CONNECTOR FOR FIR: 
FLOOR APPLIANCE AS AN INDIVIDUA 
VENT OF THIS TOTAL HEIGHT FOR IN 
OF FIRST FLOOR APPLIANCE 



s. 



-TEE WITH CAP OPTIONAL 



•EACH INTERCONNECTION TEE IS SAME SIZE AS THE 
SEGMENT OF COMMON VENT DIRECTLY ABOVE 



Principles of design of multistory vents using vent connector and common vent 
design tables (see Sections 504.3.11 through 504.3.17). 

FIGURE B-1 4 
MULTISTORY VENT SYSTEMS 



150 



2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX B 



TYPE B DOUBLE-WALL - 
GAS VENT 




ELBOW 



DRAFT HOOD EQUIPPED APPLIANCE 
120,000 BTU/H INPUT 



Fl 



TYPE-B DOUBLE-WALL- 
GAS VENT 



-10 FT LATERAL- 



h 



Y 



V 



30 FT 



VENT CONNECTOR 



FAN ASSISTED APPLIANCE 
80,000 BTU/H INPUT 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.293 1 W 

FIGURE B-15 (EXAMPLE 1) 
SINGLE DRAFT-HOOD-EQUIPPED APPLIANCE 



For SI: 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 

FIGURE B-16 (EXAMPLE 2) 
SINGLE FAN-ASSISTED APPLIANCE 



Example 2: Single fan-assisted appliance. 

An installer has an 80,000 Btu per hour input fan-assisted 
appliance that must be installed using 1 feet of lateral connec- 
tor attached to a 30-foot-high Type B vent. Two 90-degree 
elbows are needed for the installation. Can a single- wall metal 
vent connector be used for this application? 

Solution: 

Table 504.2(2) refers to the use of single-wall metal vent con- 
nectors with Type B vent. In the first column find the row asso- 
ciated with a 30-foot height and a 10-foot lateral. Read across 
this row, looking at the FAN Min and FAN Max columns, to 
find that a 3-inch-diameter single-wall metal vent connector is 
not recommended. Moving to the next larger size single wall 
connector (4 inches), note that a 4-inch-diameter single-wall 
metal connector has a recommended minimum vent capacity of 
91,000 Btu per hour and a recommended maximum vent 
capacity of 144,000 Btu per hour. The 80,000 Btu per hour fan- 
assisted appliance is outside this range, so the conclusion is that 
a single- wall metal vent connector cannot be used to vent this 
appliance using 10 feet of lateral for the connector. 

However, if the 80,000 Btu per hour input appliance could be 
moved to within 5 feet of the vertical vent, then a 4-inch single- 
wall metal connector could be used to vent the appliance. Table 
504.2(2) shows the acceptable range of vent capacities for a 4- 
inch vent with 5 feet of lateral to be between 72,000 Btu per 
hour and 157,000 Btu per hour. 



If the appliance cannot be moved closer to the vertical vent, 
then Type B vent could be used as the connector material. In 
this case. Table 504.2(1) shows that for a 30-foot-high vent 
with 10 feet of lateral, the acceptable range of vent capacities 
for a 4-inch-diameter vent attached to a fan-assisted apphance 
is between 37,000 Btu per hour and 150,000 Btu per hour. 

Example 3: Interpolating between table values. 

An installer has an 80,000 Btu per hour input appliance with a 
4-inch-diameter draft hood outlet that needs to be vented into a 
12-foot-high Type B vent. The vent connector has a 5-foot lat- 
eral length and is also Type B. Can this appliance be vented 
using a 4-inch-diameter vent? 

Solution: 

Table 504.2(1) is used in the case of an all Type B vent system. 
However, since there is no entry in Table 504.2(1) for a height 
of 12 feet, interpolation must be used. Read down the 4-inch 
diameter NAT Max column to the row associated with 10-foot 
height and 5-foot lateral to find the capacity value of 77,000 
Btu per hour. Read further down to the 15-foot height, 5-foot 
lateral row to find the capacity value of 87,000 Btu per hour. 
The difference between the 15-foot height capacity value and 
the 10-foot height capacity value is 10,000 Btu per hour. The 
capacity for a vent system with a 12-foot height is equal to the 
capacity for a 10-foot height plus Vg of the difference between 
the 10-foot and 15 -foot height values, or 77,000 4-^/5 (10,000) = 
81,000 Btu per hour. Therefore, a 4-inch-diameter vent may be 
used in the installation. 



2006 INTERNATIONAL FUEL GAS CODE® 



151 



APPENDIX B 



EXAMPLES USING COMMON VENTING TABLES 

Example 4: Common venting two draft-hood-equipped 
appliances. 

A 35,000 Btu per hour water heater is to be common vented 
with a 150,000 Btu per hour furnace using a common vent with 
a total height of 30 feet. The connector rise is 2 feet for the 
water heater with a horizontal length of 4 feet. The connector 
rise for the furnace is 3 feet with a horizontal length of 8 feet. 
Assume single- wall metal connectors will be used with Type B 
vent. What size connectors and combined vent should be used 
in this installation? 

Solution: 

Table 504.3(2) should be used to size single-wall metal vent 
connectors attached to Type B vertical vents. In the vent con- 
nector capacity portion of Table 504.3(2), find the row associ- 
ated with a 30-foot vent height. For a 2-foot rise on the vent 
connector for the water heater, read the shaded columns for 
draft-hood-equipped appliances to find that a 3-inch-diameter 
vent connector has a capacity of 37,000 Btu per hour. There- 
fore, a 3-inch single-wall metal vent connector may be used 
with the water heater. For a draft-hood-equipped furnace with a 
3-foot rise, read across the appropriate row to find that a 5-inch- 
diameter vent connector has a maximum capacity of 120,000 
Btu per hour (which is too small for the furnace) and a 6-inch- 
diameter vent connector has a maximum vent capacity of 
172,000 Btu per hour. Therefore, a 6-inch-diameter vent con- 
nector should be used with the 150,000 Btu per hour furnace. 
Since both vent connector horizontal lengths are less than the 
maximum lengths listed in Section 504.3.2, the table values 
may be used without adjustments. 



In the common vent capacity portion of Table 504.3(2), find 
the row associated with a 30-foot vent height and read over to 
the NAT + NAT portion of the 6-inch-diameter column to find a 
maximum combined capacity of 257,000 Btu per hour. Since 
the two appliances total only 185,000 Btu per hour, a 6-inch 
common vent may be used. 

Example 5a: Common venting a draft-hood-equipped 
water heater with a fan-assisted furnace into a Type B vent. 

In this case, a 35,000 Btu per hour input draft-hood- 
equipped water heater with a 4-inch-diameter draft hood outlet, 
2 feet of connector rise, and 4 feet of horizontal length is to be 
common vented with a 100,000 Btu per hour fan-assisted fur- 
nace with a 4-inch-diameter flue collar, 3 feet of connector rise, 
and 6 feet of horizontal length. The common vent consists of a 
30-foot height of Type B vent. What are the recommended vent 
diameters for each connector and the common vent? The 
installer would like to use a single-wall metal vent connector. 

Solution: - [Table 504.3(2)] 

Water Heater Vent Connector Diameter. Since the water heater 
vent connector horizontal length of 4 feet is less than the maxi- 
mum value Hsted in Section 504.3.2, the venting table values 
may be used without adjustments. Using the Vent Connector 
Capacity portion of Table 504.3(2), read down the Total Vent 
Height (H) column to 30 feet and read across the 2-foot Con- 
nector Rise (R) row to the first Btu per hour rating in the NAT 
Max column that is equal to or greater than the water heater 
input rating. The table shows that a 3-inch vent connector has a 
maximum input rating of 37,000 Btu per hour. Although this is 
greater than the water heater input rating, a 3-inch vent connec- 
tor is prohibited by Section 504.3.21. A 4-inch vent connector 



Zl 



COMBINED CAPACITY 

35,000 + 1 50,000 = 1 85,000 BTU/H 



-TYPE B DOUBLE-WALL 
GAS VENT 



SINGLE WALL 
CONNECTORS 




DRAFT HOOD-EQUIPPED 

WATER HEATER 

35,000 BTU/H INPUT 



DRAR HOOD-EQUIPMENT 

FURNACE 

150,000 BTU/H INPUT 



c 



TYPE B DOUBLE-WALL - 
GAS VENT 



COMBINED CAPACITY 

35,000 -^ 1 00,000 = 1 35,000 BTU/H 



a 



FAN-ASSISTED 

FURNACE 

100,000 BTU/H 

INPUT 




SINGLE-WALL- 
CONNECTORS 



WATER HEATER 

35,000 BTU/H 

INPUT 



FIGURE B-17 (EXAMPLE 4) 
COMMON VENTING TWO DRAFT- 
HOOD-EQUIPPED APPLIANCES 



FIGURE B-18 (EXAMPLE 5A) 

COMMON VENTING A DRAFT HOOD WITH A FAN-ASSISTED 

FURNACE INTO A TYPE B DOUBLE-WALL COMMON VENT 



152 



2006 INTERNATIONAL FUEL GAS CODE"" 



APPENDIX B 



has a maximum input rating of 67,000 Btu per hour and is equal 
to the draft hood outlet diameter. A 4-inch vent connector is 
selected. Since the water heater is equipped with a draft hood, 
there are no minimum input rating restrictions. 

Furnace Vent Connector Diameter. Using the Vent Connec- 
tor Capacity portion of Table 504.3(2), read down the Total 
Vent Height (H) column to 30 feet and across the 3-foot Con- 
nector Rise (R) row. Since the furnace has a fan-assisted com- 
bustion system, find the first FAN Max column with a Btu per 
hour rating greater than the furnace input rating. The 4-inch 
vent connector has a maximum input rating of 1 19,000 Btu per 
hour and a minimum input rating of 85,000 Btu per hour. The 
100,000 Btu per hour furnace in this example falls within this 
range, so a 4-inch connector is adequate. Since the furnace vent 
connector horizontal length of 6 feet does not exceed the maxi- 
mum value listed in Section 504.3.2, the venting table values 
may be used without adjustment. If the furnace had an input 
rating of 80,000 Btu per hour, then a Type B vent connector 
[see Table 504. 3 ( 1 )] would be needed in order to meet the mini- 
mum capacity limit. 

Common Vent Diameter. The total input to the common vent 
is 135,000 Btu per hour. Using the Common Vent Capacity 
portion of Table 504.3(2), read down the Total Vent Height (H) 
column to 30 feet and across this row to find the smallest vent 
diameter in the FAN + NAT column that has a Btu per hour rat- 
ing equal to or greater than 135,000 Btu per hour. The 4-inch 
common vent has a capacity of 1 32,000 Btu per hour and the 5- 
inch common vent has a capacity of 202,000 Btu per hour. 
Therefore, the 5-inch common vent should be used in this 
example. 

Summary. In this example, the installer may use a 4-inch- 
diameter, single-wall metal vent connector for the water heater 
and a 4-inch-diameter, single- wall metal vent connector for the 
furnace. The common vent should be a 5 -inch-diameter Type B 
vent. 

Example 5b: Common venting into a masonry chimney. 

In this case, the water heater and fan-assisted furnace of Exam- 
ple 5a are to be common vented into a clay tile-lined masonry 
chimney with a 30-foot height. The chimney is not exposed to 
the outdoors below the roof line. The internal dimensions of the 
clay tile liner are nominally 8 inches by 12 inches. Assuming 
the same vent connector heights, laterals, and materials found 
in Example 5 a, what are the recommended vent connector 
diameters, and is this an acceptable installation? 

Solution: 

Table 504.3(4) is used to size common venting installations 
involving single- wall connectors into masonry chimneys. 

Water Heater Vent Connector Diameter. Using Table 
504.3(4), Vent Connector Capacity, read down the Total Vent 
Height (H) column to 30 feet, and read across the 2-foot Con- 
nector Rise (R) row to the first Btu per hour rating in the NAT 
Max column that is equal to or greater than the water heater 
input rating. The table shows that a 3-inch vent connector has a 
maximum input of only 31,000 Btu per hour while a 4-inch 
vent connector has a maximum input of 57,000 Btu per hour. A 
4-inch vent connector must therefore be used. 



Furnace Vent Connector Diameter. Using the Vent Connec- 
tor Capacity portion of Table 504,3(4), read down the Total 
Vent Height (H) column to 30 feet and across the 3-foot Con- 
nector Rise (/?) row. Since the furnace has a fan-assisted com- 
bustion system, find the first FAN Max column with a Btu per 
hour rating greater than the furnace input rating. The 4-inch 
vent connector has a maximum input rating of 127,000 Btu per 
hour and a minimum input rating of 95,000 Btu per hour. The 
100,000 Btu per hour furnace in this example falls within this 
range, so a 4-inch connector is adequate. 

Masonry Chimney. From Table B- 1 , the equivalent area for a 
nominal liner size of 8 inches by 12 inches is 63.6 square 
inches. Using Table 504.3(4), Common Vent Capacity, read 
down the FAN + NAT column under the Minimum Internal 
Area of Chimney value of 63 to the row for 30-foot height to 
find a capacity value of 739,000 Btu per hour. The combined 
input rating of the furnace and water heater, 135,000 Btu per 
hour, is less than the table value, so this is an acceptable instal- 
lation. 

Section 504.3.17 requires the common vent area to be no 
greater than seven times the smallest listed appliance catego- 
rized vent area, flue collar area, or draft hood outlet area. Both 
apphances in this installation have 4-inch-diameter outlets. 
From Table B- 1 , the equivalent area for an inside diameter of 4 
inches is 12.2 square inches. Seven times 12.2 equals 85.4, 
which is greater than 63.6, so this configuration is acceptable. 

Example 5c: Common venting into an exterior masonry 
chimney. 

In this case, the water heater and fan-assisted furnace of Exam- 
ples 5a and 5b are to be common vented into an exterior 
masonry chimney. The chimney height, clay tile liner dimen- 
sions, and vent connector heights and laterals are the same as in 
Example 5b. This system is being installed in Charlotte, North 
Carolina. Does this exterior masonry chimney need to be 
relined? If so, what corrugated metallic liner size is recom- 
mended? What vent connector diameters are recommended? 

Solution: 

According to Section 504.3.20, TyP^ ^ vent connectors are 
required to be used with exterior masonry chimneys. Use Table 
504.3(7) to size FAN+NAT common venting installations 
involving Type-B double wall connectors into exterior 
masonry chimneys. 

The local 99-percent winter design temperature needed to 
use Table 504.3(7) can be found in the ASHRAE Handbook of 
Fundamentals. For Charlotte, North CaroUna, this design tem- 
perature is 19°F. 

Chimney Liner Requirement. As in Example 5b, use the 63 
square inch Internal Area columns for this size clay tile liner. 
Read down the 63 square inch column of Table 504.3(7a) to the 
30-foot height row to find that the combined appliance maxi- 
mum input is 747,000 Btu per hour. The combined input rating 
of the appliances in this installation, 135,000 Btu per hour, is 
less than the maximum value, so this criterion is satisfied. Table 
504.3(7b), at a 19°F design temperature, and at the same vent 
height and internal area used above, shows that the minimum 
allowable input rating of a space-heating appliance is 470,000 
Btu per hour. The furnace input rating of 100,000 Btu per hour 



2006 INTERNATIONAL FUEL GAS CODE® 



153 



APPENDIX B 



is less than this minimum value. So this criterion is not satis- 
fied, and an alternative venting design needs to be used, such as 
a Type B vent shown in Example 5a or a listed chimney liner 
system shown in the remainder of the example. 

According to Section 504.3.19, Table 504.3(1) or 504.3(2) is 
used for sizing corrugated metallic liners in masonry chim- 
neys, with the maximum common vent capacities reduced by 
20 percent. This example will be continued assuming Type B 
vent connectors. 

Water Heater Vent Connector Diameter. Using Table 
504.3(1), Vent Connector Capacity, read down the Total Vent 
Height (H) column to 30 feet, and read across the 2-foot Con- 
nector Rise (/?) row to the first Btu/h rating in the NAT Max col- 
umn that is equal to or greater than the water heater input rating. 
The table shows that a 3-inch vent connector has a maximum 
capacity of 39,000 Btu/h. Although this rating is greater than 
the water heater input rating, a 3-inch vent connector is prohib- 
ited by Section 504.3.21. A 4-inch vent connector has a maxi- 
mum input rating of 70,000 Btu/h and is equal to the draft hood 
outlet diameter. A 4-inch vent connector is selected. 

Furnace Vent Connector Diameter. Using Table 504.3(1), 
Vent Connector Capacity, read down the Vent Height (H) col- 
umn to 30 feet, and read across the 3-foot Connector Rise (R) 
row to the first Btu per hour rating in the FAN Max column that 
is equal to or greater than the furnace input rating. The 100,000 
Btu per hour furnace in this example falls within this range, so a 
4-inch connector is adequate. 

Chimney Liner Diameter. The total input to the common 
vent is 135,000 Btu per hour. Using the Common Vent Capac- 
ity Portion of Table 504.3(1), read down the Vent Height (//) 
column to 30 feet and across this row to find the smallest vent 
diameter in the FAN+NAT column that has a Btu per hour rat- 
ing greater than 135,000 Btu per hour. The 4-inch common 
vent has a capacity of 138,000 Btu per hour. Reducing the max- 
imum capacity by 20 percent (Section 504.3.19) results in a 
maximum capacity for a 4-inch corrugated liner of 11 0,000 Btu 
per hour, less than the total input of 135,000 Btu per hour. So a 
larger liner is needed. The 5-inch common vent capacity listed 
in Table 504.3(1) is 210,000 Btu per hour, and after reducing by 
20 percent is 168,000 Btu per hour. Therefore, a 5-inch corru- 
gated metal liner should be used in this example. 

Single- Wall Connectors. Once it has been established that 
relining the chimney is necessary. Type B double-wall vent 
connectors are not specifically required. This example could be 
redone using Table 504.3(2) for single-wall vent connectors. 
For this case, the vent connector and liner diameters would be 
the same as found above with Type B double- wall connectors. 



TABLE B-1 

MASONRY CHIMNEY LINER DIMENSIONS 

WITH CIRCULAR EQUIVALENTS" 



NOMINAL LINER 
SIZE (Inches) 


INSIDE 

DIMENSIONS OF 

LINER (inches) 


INSIDE 

DIAMETER OR 

EQUIVALENT 

DIAMETER 

(inches) 


EQUIVALENT 

AREA 

(square inches) 


4x8 


2V2 X 6V2 


4 


12.2 


5 


19.6 


6 


28.3 


7 


38.3 


8x8 


6V4 X 6V4 


7.4 


42.7 


8 


50.3 


8x12 


6V2 X IOV2 


9 


63.6 


10 


78.5 


12x12 


93/4 X 93/4 


10.4 


83.3 


11 


95 


12x16 


9V2 X 13V2 


11.8 


107.5 


12 


113.0 


14 


153.9 


16x16 


I3V4 X 131/4 


14.5 


162.9 


15 


176.7 


16x20 


13x17 


16.2 


206.1 


18 


254.4 


20x20 


16% X I6V4 


18.2 


260.2 


20 


314.1 


20x24 


I6V2 X 2OV2 


20.1 


314.2 


22 


380.1 


24x24 


20V4 X 20V4 


22.1 


380.1 


24 


452.3 


24x28 


20V4 X 20V4 


24.1 


456.2 


28x28 


241/4x241/4 


26.4 


543.3 


27 


572.5 


30x30 


251/2 X 251/2 


27.9 


607 


30 ■ 


706.8 


30x36 


251/2x311/2 


30.9 


749.9 


33 


855.3 


36x36 


311/2x311/2 


34.4 


929.4 


36 


1017.9 



For SI: 1 inch = 25.4 mm, 1 square inch = 645. 16 m^. 

a. Where liner sizes differ dimensionally from those shown in Table B-1, 
equivalent diameters may be determined from pubUshed tables for square 
and rectangular ducts of equivalent carrying capacity or by other engineering 
methods. 



154 



2006 INTERNATIONAL FUEL GAS CODE® 



m 

3) 

z 
> 

H 
O 

z 
> 



C 

m 

I- 

o 

> 
w 

o 

O 
O 

ni 



-10T 
(-23°C) 




10T 
(-23°C) 



37" F 

(3°C) 



37T 
(3°C) 



FIGURE B-19 



156 2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX C (IFGS) 

EXIT TERMINALS OF MECHANICAL DRAFT AND 
DIRECT-VENT VENTING SYSTEMS 



(This appendix is informative and is not part of the code.) 



DIRECT-VENT TERMINAL CLEARANCE 
MINIMUM CLEARANCE, C 

INPUT (BTU/HR) CLEARANCE (IN.) 

10.000 OR LESS 6 

10.001 TO 50,000 9 
OVER 50,000 12 
[SEE SECTION 503.8, ITEM 3] 




MECHANICAL DRAFT 

VENT TERMINAL 

[SEE SECTION 503.8, ITEM 1] 



FORCED-AIR INLET 



For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W 

APPENDIX C 
EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS 



2006 INTERNATIONAL FUEL GAS CODE® 



157 



158 2006 INTERNATIONAL FUEL GAS CODE® 



APPENDIX D (IFGS) 

RECOMMENDED PROCEDURE FOR SAFETY INSPECTION OF AN 
EXISTING APPLIANCE INSTALLATION 



(This appendix is informative and is not part of the code.) 



The following procedure is intended as a guide to aid in deter- 
mining that an appliance is properly installed and is in a safe 
condition for continuing use. 

This procedure is predicated on central furnace and boiler 
installations, and it should be recognized that generalized pro- 
cedures cannot anticipate all situations. Accordingly, in some 
cases, deviation from this procedure is necessary to determine 
safe operation of the equipment. 

(a) This procedure should be performed prior to any 
attempt at modification of the appliance or of the instal- 
lation. 

(b) If it is determined there is a condition that could result 
in unsafe operation, the appliance should be shut off 
and the owner advised of the unsafe condition. The fol- 
lowing steps should be followed in making the safety 
inspection: 

1 . Conduct a check for gas leakage. (See Section 
406.6) 

2. Visually inspect the venting system for proper 
size and horizontal pitch and determine there is 
no blockage or restriction, leakage, corrosion, 
and other deficiencies that could cause an unsafe 
condition. 

3. Shut off all gas to the appliance and shut off any 
other fuel-gas-buming appliance within the same 
room. Use the shutoff valve in the supply line 
to each appliance. 

4. Inspect burners and crossovers for blockage and 
corrosion. 

5. Applicable only to furnaces. Inspect the heat 
exchanger for cracks, openings, or excessive cor- 
rosion. 

6. Applicable only to boilers. Inspect for evidence 
of water or combustion product leaks. 

7. Insofar as is practical, close all building doors 
and windows and all doors between the space in 
which the appliance is located and other spaces 
of the building. Turn on clothes dryers. Turn on 
any exhaust fans, such as range hoods and bath- 
room exhausts, so they will operate at maximum 
speed. Do not operate a summer exhaust fan. 
Close fireplace dampers. If, after completing 
Steps 8 through 13, it is believed sufficient com- 
bustion air is not available, refer to Section 304 of 
this code for guidance. 



8 . Place the appliance being inspected in operation. 
Follow the lighting instructions. Adjust the 
thermostat so appliance will operate continu- 
ously. 

9. Determine that the pilot(s), where provided, is 
burning properly and that the main burner igni- 
tion is satisfactory by interrupting and reestab- 
lishing the electrical supply to the appliance in 
any convenient manner. If the appliance is 
equipped with a continuous pilot(s), test the pilot 
safety device(s) to determine if it is operating 
properly by extinguishing the pilot(s) when the 
main bumer(s) is off and determining, after 3 
minutes, that the main burner gas does not flow 
upon a call for heat. If the appliance is not pro- 
vided with a pilot(s), test for proper operation of 
the ignition system in accordance with the appli- 
ance manufacturer's lighting and operating 
instructions. 

10. Visually determine that the main burner gas is 
burning properly (i.e., no floating, lifting, or 
flashback). Adjust the primary air shutter(s) as 
required. If the appliance is equipped with high 
and low flame controlling or flame modulation, 
check for proper main burner operation at low 
flame. 

1 1 . Test for spillage at the draft hood relief opening 
after 5 minutes of main burner operation. Use a 
flame of a match or candle or smoke. 

12. Turn on all other fuel-gas-buming appliances 
within the same room so they will operate at their 
full inputs. Follow lighting instructions for 
each appliance. 

13. Repeat Steps 10 and 11 on the appliance being 
inspected. 

14. Return doors, windows, exhaust fans, fireplace 
dampers, and any other fuel-gas-buming appli- 
ance to their previous conditions of use. 

15. Applicable only to furnaces. Check both the 
limit control and the fan control for proper opera- 
tion. Limit control operation can be checked by 
blocking the circulating air inlet or temporarily 
disconnecting the electrical supply to the blower 
motor and determining that the limit control acts 
to shut off the main burner gas. 



2006 INTERNATIONAL FUEL GAS CODE^ 



159 



APPENDIX D 



16. Applicable only to boilers. Determine that the 
water pumps are in operating condition. Test low 
water cutoffs, automatic feed controls, pressure 
and temperature limit controls, and relief valves 
in accordance with the manufacturer's recom- 
mendations to determine that they are in operat- 
ing condition. 



1 60 2006 INTERNATIONAL FUEL GAS CODE*" 



INDEX 



ACCESS, APPLIANCES 

Duct furnaces 610.3 

General 306 

Shutoff valves 409.1 .3, 409.3.1 , 409.5 

Wail furnaces, vented 608.6 

ADJUSTMENTS 608.6, 621.6 

ADMINISTRATION Chapter 1 

Alternate materials and methods 105.2 

Alternate methods of sizing chimneys. . . . 503.5.5 

Appeals 1 09 

Certificates 104.8 

Duties and powers of code official 1 04 

Fees 106.4, 106.5 

Inspections 104.4, 104.8, 107 

Liability 103.4 

Permits 106 

Plan review 106.5.3(3) 

Severability 101 .5 

Scope 101.2 

Title 101.1 

Violations and penalties 108 

AIR, COMBUSTION 

Defined 202 

Requirements 303.3, 304 

AIR-CONDITIONING EQUIPMENT 627 

Clearances 308.3 

ALTERNATE MATERIALS AND 

METHODS 105.2 

APPLIANCES 

Broilers for indoor use 623.5 

Connections to building piping 41 1 

Cooking 623 

Decorative 602 

Decorative vented 202, 303.3, 

Table 503.4, 604 

Domestic ranges 623.4 

Electrical 309 

Installation Chapter 6 

Prohibited locations 303.3 

Protection from damage 303.4 

B 

BENDS, PIPE 405 

BOILERS 

Existing installations Appendix D 



Listed 631 

Prohibited locations 303.3 

Unlisted 632 

BUSHINGS 403.10.4, 404.3 



CENTRAL FURNACES 

Defined 202 

Existing installation Appendix D 

CERTIFICATES 104.8 

CHIMNEYS Chapter 5 

Alternate methods of sizing 503.5.5 

Clearance reduction 308 

Damper opening area 634 

Defined 202 

CLEARANCE REDUCTION 308 

CLEARANCES 

Air-conditioning equipment 627.4 

Boilers 308.4 

Domestic ranges 623.4 

Floor furnaces 609.4, 609.6 

Open-top broiler units 623.5.1 

Refrigerators 625.1 

Unit heater 620.4 

CLOTHES DRYERS 

Defined 202 

Exhaust 614 

General 613 

CODE OFFICIAL 

Defined 202 

Duties and powers 1 04 

COMBUSTION AIR 

Combination indoor and outdoor 304.7 

Defined 202 

Exhaust effect 304.4 

Free area 304.5.3.1, 304.5.3.2, 304.6.1, 

304.6.2,304.10 

Horizontal ducts 304.6.1 

Indoor 304.5 

Outdoor 304.6 

Sauna heaters 615.5 

Sources of (from) 304.1 1 

Vertical ducts 304.6.1 

COMPRESSED NATURAL GAS 413 

CONCEALED PIPING 404.2 

CONDENSATE DISPOSAL 307 



2006 INTERNATIONAL FUEL GAS CODE® 



161 



INDEX 



CONTROLS 

Boilers 631.2 

Gas pressure regulators 410.1, 628.4 

CONVERSION BURNERS 503.12.1, 619 

COOKING APPLIANCES 623 

CORROSION PROTECTION 404.8 

CREMATORIES 606 

CUTTING, NOTCHING, AND 
BORED HOLES 302.3 

D 

DAMPERS, VENT 503.14 

DECORATIVE APPLIANCES 602 

DEFINITIONS Chapter2 

DIRECT VENT APPLIANCES 

Defined 202 

Installation 304.1 

DITCH FOR PIPING . . . . . . .......... 107.1(1) 

DIVERSITY FACTOR 402.2, Appendix A 

DRAFT HOODS 202, 503.12 

DUCT FURNACES 202, 610 

ELECTRICAL CONNECTIONS 309.2 

EXHAUST SYSTEMS 202, 503.2.1 , 503.3.4 

F 

FEES 104.8, 106.4, 106.5 

FLOOD HAZARD . . . . ...... .301.11 

FLOOR FURNACES 609 

FURNACES 

Central heating, clearance 308.3, 308.4 

Duct 610 

Floor 609 

, Prohibited location 303.3 

-■:) Vented wall 608 

G 

GARAGE, INSTALLATION 305.3, 305.4, 305.5 

GASEOUS HYDROGEN SYSTEMS . . . 635, Chapter 7 

General requirements 703 

Piping, use and handling 704 

Testing 705 

GROUNDING, PIPE . . 309.1 

HISTORIC BUILDINGS 102.6 

HOT PLATES AND LAUNDRY 
STOVES 501.8, 623.1 



I 

ILLUMINATING APPLIANCES 628 

INCINERATORS 606, 607 

INFRARED RADIANT HEATERS ... 630 

INSPECTIONS 104.4, 104.8, 107 

INSTALLATION, APPLIANCES 

Garage 305 

General 301 

Listed and unlisted appliances 301.3, 305.1 

Specific appliances Chapter 6 

K 

KILNS 629 

L 

LIQUEFIED PETROLEUM GAS 

Defined 202 

Motor vehicle fuel-dispensing stations 412 

Piping material 403.6.2, 403.1 1 

Size of pipe or tubing. Appendix A 

Storage .401.2 

Systems 402.6.1 

Thread compounds 403.9.3 

LOG LIGHTERS 603 

M 

MAKE-UP AIR HEATERS , .611,612 

Industhal .612 

Venting 501 .8 

MATERIALS, DEFECTIVE 

Repair 301 .9 

Workmanship and defects 403.7 

METERS 

Interconnections 401 .6 

Identification 401 .7 

Multiple Installations 401.6 

MINIMUM SAFE PERFORMANCE, 
VENT SYSTEMS 503.3 

o 

OUTLET CLOSURES 404.12 

Location 404.1 3 

OVERPRESSURE PROTECTION 416 

OXYGEN DEPLETION SYSTEM 

Defined 202 

Unvented room heaters 303.3(3), 621 .6 



162 



2006 INTERNATIONAL FUEL GAS CODE® 



INDEX 



P 

PIPE SIZING 402 

PIPING 

Bends 405 

Changes in direction 405 

Drips and slopes 408 

Installation 404 

Inspection 406 

Materials 403 

Purging 406.7 

Sizing 402 

Support 407, 415 

Testing 406 

POOL HEATERS 617 

POWERS AND DUTIES OF 
THE CODE OFFICIAL 104 

PROHIBITED INSTALLATIONS 

Floor furnaces 609.2 

Fuel-burning appliances 303.3 

Piping in partitions 404.2 

Plastic piping 404.14.1 

Unvented room heater 621 .4 

Vent connectors 503.3.3 

PURGING 406.7 

R 

RADIANT HEATERS 630 

RANGES, DOMESTIC 623.4 

REFRIGERATORS 501 .8, 625 

REGULATORS, PRESSURE 410.1, 628.4 

ROOFTOP INSTALLATIONS 306.5 

ROOM HEATERS 

Defined 202 

Location 303.3 

Unvented 621 

Vented 622 

S 

SAFETY SHUTOFF DEVICES 

Flame safeguard device 602.2 

Unvented room heaters 621 .6 

SAUNA HEATERS 615 

SCOPE 101.2 

SEISMIC RESISTANCE 301.12 

SERVICE SPACE .306 

SPA HEATERS . .617 



STANDARDS Chapter8 

STRUCTURAL SAFETY 302.1 

SUPPORTS, PIPING 407, 415 

T 

TESTING 107 

THIMBLE, VENT 503.10.11, 

503.10.15 

THREADS 

Damaged 403.9.1 

Specifications 403.9 

TOILETS 626 

u 

UNIT HEATERS 620 

UNLISTED BOILERS 632 

UNVENTED ROOM HEATERS 621 

V 

VALIDITY 106.4.2 

VALVES, MULTIPLE 
HOUSE LINES 409.3 

VALVES, SHUTOFF Appliances 409.5 

VENTILATING HOODS 503.2.1, 503.3.4 

VENTED DECORATIVE 
APPLIANCES 604 

VENTED ROOM HEATERS 622 

VENTED WALL FURNACES 608 

VENTS 

Caps 503.6.6 

Direct vent 503.2.3 

Equipment not requiring vents . . . .■ 501.8 

Gas vent termination 503.6.4 

General Chapter 5 

Integral 505 

Listed and labeled 502.1 

Mechanical vent 505 

VENT, SIZING 

Category I appliances 502, 503, 504 

Multi-appliance 504.3 

Multistory 504.3.13, 504.3.14, 

504.3.15,504.3.16 

Single appliance 504.2 

VIBRATION ISOLATION 301.8 

VIOLATIONS AND PENALTIES 108 



2006 INTERNATIONAL FUEL GAS CODE® 



163 



INDEX 



w 

WALL FURNACES, VENTED 608 

WARM AIR FURNACES 618 

WATER HEATERS 624 

WIND RESISTANCE 301.10 



164 2006 INTERNATIONAL FUEL GAS CODE*" 



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