•
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
This page left intentionally blank.
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*'
This page left intentionally blank.
2006 INTERNATIONAL FUEL GAS CODE® 7R
This page left intentionally blank.
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-
2006 INTERNATIONAL FUEL GAS CODE®
ADMINISTRATION
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.
2006 INTERNATIONAL FUEL GAS CODE®
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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.
2006 INTERNATIONAL FUEL GAS CODE®
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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®
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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.
70
2006 INTERNATIONAL FUEL GAS CODE""
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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.
2006 INTERNATIONAL FUEL GAS CODE®
71
GAS PIPING INSTALLATIONS
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.
72
2006 INTERNATIONAL FUEL GAS CODE''
GAS PIPING INSTALLATIONS
[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^
73
GAS PIPING INSTALLATIONS
[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
2006 INTERNATIONAL FUEL GAS CODE*"
GAS PIPING INSTALLATIONS
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®
75
GAS PIPING INSTALLATIONS
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
2006 INTERNATIONAL FUEL GAS CODE*^
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
2006 INTERNATIONAL FUEL GAS CODE"^
83
CHIMNEYS AND VENTS
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
2006 INTERNATIONAL FUEL GAS CODE^
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®
85
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 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
2006 INTERNATIONAL FUEL GAS CODE®
CHIMNEYS AND VENTS
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.
2006 INTERNATIONAL FUEL GAS CODE®
87
CHIMNEYS AND VENTS
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)
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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
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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
2006 INTERNATIONAL FUEL GAS CODE<^
117
SPECIFIC APPLIANCES
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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119
SPECIFIC APPLIANCES
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
2006 INTERNATIONAL FUEL GAS CODE®
121
SPECIFIC APPLIANCES
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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2006 INTERNATIONAL FUEL GAS CODE®
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.
2006 INTERNATIONAL FUEL GAS CODE®
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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®
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.
[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.
126
2006 INTERNATIONAL FUEL GAS CODE®
GASEOUS HYDROGEN SYSTEMS
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®
127
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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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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10,000,000
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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International Code Council
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REF 66-05-193
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