,
, TABLE OF CONTENTS
CHAPTER 1 SCOPE AND ADMINISTRATION . . 1-1 306 Access and Service Space (IFGC) . . . . . . . . . . . . . .3-7
307 Condensate Disposal (IFGC) . . . . . . . . . . . . . . . . . .3-9
PART 1—SCOPE AND APPLICATION. . . . . . . . . . . 1-1 308 Clearance Reduction (IFGS) . . . . . . . . . . . . . . . . . .3-9
Section 309 Electrical (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
101 Scope and General Requirements (IFGC) . . . . . . . 1-1 310 Electrical Bonding (IFGS) . . . . . . . . . . . . . . . . . . .3-12
102 Applicability (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 1-2
CHAPTER 4 GAS PIPING INSTALLATIONS . . . . .4-1
PART 2—ADMINISTRATION AND Section
ENFORCEMENT . . . . . . . . . . . . . . . . . 1-3 401 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Section 402 Pipe Sizing (IFGS). . . . . . . . . . . . . . . . . . . . . . . . . .4-1
103 Code Compliance Agency (IFGC) . . . . . . . . . . . . . 1-3 403 Piping Materials (IFGS). . . . . . . . . . . . . . . . . . . . .4-39
104 Duties and Powers of the 404 Piping System Installation (IFGC). . . . . . . . . . . . .4-41
Code Official (IFGC) . . . . . . . . . . . . . . . . . . . . . 1-3
405 Piping Bends and Changes in
105 Approval (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Direction (IFGS) . . . . . . . . . . . . . . . . . . . . . . . .4-44
106 Permits (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 406 Inspection, Testing and Purging (IFGS) . . . . . . . .4-44
107 Construction Documents (IFGC) . . . . . . . . . . . . . . 1-5 407 Piping Support (IFGC). . . . . . . . . . . . . . . . . . . . . .4-46
108 Notice of Approval (IFGC) . . . . . . . . . . . . . . . . . . 1-6 408 Drips and Sloped Piping (IFGC) . . . . . . . . . . . . . .4-46
109 Fees (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 409 Shutoff Valves (IFGC). . . . . . . . . . . . . . . . . . . . . .4-47
110 Service Utilities (IFGC) . . . . . . . . . . . . . . . . . . . . . 1-6 410 Flow Controls (IFGC) . . . . . . . . . . . . . . . . . . . . . .4-48
111 Temporary Equipment, 411 Appliance and Manufactured
Systems and Uses (IFGC) . . . . . . . . . . . . . . . . . 1-6 Home Connections (IFGC) . . . . . . . . . . . . . . . .4-49
112 Inspections and Testing (IFGC) . . . . . . . . . . . . . . . 1-7 412 Liquefied Petroleum Gas Motor Vehicle
113 Means of Appeal (IFGC) . . . . . . . . . . . . . . . . . . . . 1-8 Fuel-dispensing Facilities (IFGC) . . . . . . . . . . .4-50
114 Board of Appeals (IFGC) . . . . . . . . . . . . . . . . . . . . 1-8 413 Compressed Natural Gas Motor Vehicle
Fuel-dispensing Facilities (IFGC) . . . . . . . . . . .4-51
115 Violations (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
414 Supplemental and Standby
116 Stop Work Order (IFGC) . . . . . . . . . . . . . . . . . . . . 1-9
Gas Supply (IFGC) . . . . . . . . . . . . . . . . . . . . . .4-53
415 Piping Support Intervals (IFGS) . . . . . . . . . . . . . .4-53
CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . 2-1
416 Overpressure Protection Devices (IFGS). . . . . . . .4-53
Section
201 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
CHAPTER 5 CHIMNEYS AND VENTS . . . . . . . . . .5-1
202 General Definitions (IFGC) . . . . . . . . . . . . . . . . . . 2-1
Section
501 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
CHAPTER 3 GENERAL REGULATIONS . . . . . . . 3-1
502 Vents (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Section
503 Venting of Appliances (IFGS) . . . . . . . . . . . . . . . . .5-3
301 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
504 Sizing of Category I Appliance
302 Structural Safety (IFGC) . . . . . . . . . . . . . . . . . . . . 3-2 Venting Systems (IFGS) . . . . . . . . . . . . . . . . . .5-13
303 Appliance Location (IFGC) . . . . . . . . . . . . . . . . . . 3-2 505 Direct-vent, Integral Vent, Mechanical
304 Combustion, Ventilation and Vent and Ventilation/Exhaust
Dilution Air (IFGS) . . . . . . . . . . . . . . . . . . . . . . 3-3 Hood Venting (IFGC) . . . . . . . . . . . . . . . . . . . .5-17
305 Installation (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 506 Factory-built Chimneys (IFGC). . . . . . . . . . . . . . .5-18
2021 INTERNATIONAL FUEL GAS CODE® xiii
, TABLE OF CONTENTS
CHAPTER 6 SPECIFIC APPLIANCES . . . . . . . . . . 6-1 634 Gaseous Hydrogen Systems (IFGC) . . . . . . . . . . .6-11
Section 635 Outdoor Decorative Appliances (IFGC) . . . . . . . .6-11
601 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
602 Decorative Appliances for Installation CHAPTER 7 GASEOUS HYDROGEN
in Fireplaces (IFGC). . . . . . . . . . . . . . . . . . . . . . 6-1 SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . .7-1
603 Log Lighters (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-1 Section
604 Vented Gas Fireplaces 701 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
(Decorative Appliances) (IFGC) . . . . . . . . . . . . 6-1 702 General Definitions (IFGC) . . . . . . . . . . . . . . . . . . .7-1
605 Vented Gas Fireplace Heaters (IFGC) . . . . . . . . . . 6-1 703 General Requirements (IFGC). . . . . . . . . . . . . . . . .7-1
606 Incinerators and Crematories (IFGC). . . . . . . . . . . 6-1 704 Piping, Use and Handling (IFGC) . . . . . . . . . . . . . .7-2
607 Commercial-industrial Incinerators (IFGC). . . . . . 6-1 705 Testing of Hydrogen Piping Systems (IFGC) . . . . .7-3
608 Vented Wall Furnaces (IFGC) . . . . . . . . . . . . . . . . 6-1 706 Location of Gaseous
609 Floor Furnaces (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-2 Hydrogen Systems (IFGC) . . . . . . . . . . . . . . . . .7-4
610 Duct Furnaces (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-2 707 Operation and Maintenance of Gaseous
Hydrogen Systems (IFGC) . . . . . . . . . . . . . . . . .7-4
611 Nonrecirculating Direct-fired Industrial
708 Design of Liquefied Hydrogen Systems
Air Heaters (IFGC). . . . . . . . . . . . . . . . . . . . . . . 6-2
Associated with Hydrogen Vaporization
612 Recirculating Direct-fired Industrial Air Operations (IFGC) . . . . . . . . . . . . . . . . . . . . . . . .7-4
Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
613 Clothes Dryers (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-3 CHAPTER 8 REFERENCED STANDARDS . . . . . . .8-1
614 Clothes Dryer Exhaust (IFGC). . . . . . . . . . . . . . . . 6-3
615 Sauna Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-5 APPENDIX A SIZING AND CAPACITIES OF
616 Engine and Gas Turbine-powered GAS PIPING (IFGS) . . . . . . . . . . . . . A-1
Equipment (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-6 Section
617 Pool and Spa Heaters (IFGC). . . . . . . . . . . . . . . . . 6-6 A101 General Piping Considerations . . . . . . . . . . . . . . . A-1
618 Forced-air Warm-air Furnaces (IFGC). . . . . . . . . . 6-6 A102 Description of Tables . . . . . . . . . . . . . . . . . . . . . . A-1
619 Conversion Burners (IFGC) . . . . . . . . . . . . . . . . . . 6-7 A103 Use of Capacity Tables . . . . . . . . . . . . . . . . . . . . . A-4
620 Unit Heaters (IFGC). . . . . . . . . . . . . . . . . . . . . . . . 6-7 A104 Use of Sizing Equations . . . . . . . . . . . . . . . . . . . . A-6
621 Unvented Room Heaters (IFGC) . . . . . . . . . . . . . . 6-7 A105 Pipe and Tube Diameters . . . . . . . . . . . . . . . . . . . A-7
622 Vented Room Heaters (IFGC) . . . . . . . . . . . . . . . . 6-8 A106 Examples of Piping System Design and
623 Cooking Appliances (IFGC) . . . . . . . . . . . . . . . . . 6-8 Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
624 Water Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-8
APPENDIX B SIZING OF VENTING SYSTEMS
625 Refrigerators (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-9 SERVING APPLIANCES
626 Gas-fired Toilets (IFGC) . . . . . . . . . . . . . . . . . . . . 6-9 EQUIPPED WITH DRAFT
627 Air-conditioning Appliances (IFGC) . . . . . . . . . . . 6-9 HOODS, CATEGORY I
APPLIANCES AND
628 Illuminating Appliances (IFGC) . . . . . . . . . . . . . 6-10
APPLIANCES LISTED
629 Small Ceramic Kilns (IFGC) . . . . . . . . . . . . . . . . 6-10 FOR USE WITH TYPE B
630 Infrared Radiant Heaters (IFGC) . . . . . . . . . . . . . 6-10 VENTS (IFGS) . . . . . . . . . . . . . . . . . . B-1
631 Boilers (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 Section
632 Equipment Installed in Existing B101 Examples Using Single-appliance
Unlisted Boilers (IFGC) . . . . . . . . . . . . . . . . . . 6-10 Venting Tables . . . . . . . . . . . . . . . . . . . . . . . . . B-1
633 Stationary Fuel-cell Power Systems (IFGC) . . . . 6-11 B102 Examples Using Common Venting Tables. . . . . . B-4
xiv 2021 INTERNATIONAL FUEL GAS CODE®
, TABLE OF CONTENTS
CHAPTER 1 SCOPE AND ADMINISTRATION . . 1-1 306 Access and Service Space (IFGC) . . . . . . . . . . . . . .3-7
307 Condensate Disposal (IFGC) . . . . . . . . . . . . . . . . . .3-9
PART 1—SCOPE AND APPLICATION. . . . . . . . . . . 1-1 308 Clearance Reduction (IFGS) . . . . . . . . . . . . . . . . . .3-9
Section 309 Electrical (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . .3-12
101 Scope and General Requirements (IFGC) . . . . . . . 1-1 310 Electrical Bonding (IFGS) . . . . . . . . . . . . . . . . . . .3-12
102 Applicability (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 1-2
CHAPTER 4 GAS PIPING INSTALLATIONS . . . . .4-1
PART 2—ADMINISTRATION AND Section
ENFORCEMENT . . . . . . . . . . . . . . . . . 1-3 401 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Section 402 Pipe Sizing (IFGS). . . . . . . . . . . . . . . . . . . . . . . . . .4-1
103 Code Compliance Agency (IFGC) . . . . . . . . . . . . . 1-3 403 Piping Materials (IFGS). . . . . . . . . . . . . . . . . . . . .4-39
104 Duties and Powers of the 404 Piping System Installation (IFGC). . . . . . . . . . . . .4-41
Code Official (IFGC) . . . . . . . . . . . . . . . . . . . . . 1-3
405 Piping Bends and Changes in
105 Approval (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Direction (IFGS) . . . . . . . . . . . . . . . . . . . . . . . .4-44
106 Permits (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 406 Inspection, Testing and Purging (IFGS) . . . . . . . .4-44
107 Construction Documents (IFGC) . . . . . . . . . . . . . . 1-5 407 Piping Support (IFGC). . . . . . . . . . . . . . . . . . . . . .4-46
108 Notice of Approval (IFGC) . . . . . . . . . . . . . . . . . . 1-6 408 Drips and Sloped Piping (IFGC) . . . . . . . . . . . . . .4-46
109 Fees (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 409 Shutoff Valves (IFGC). . . . . . . . . . . . . . . . . . . . . .4-47
110 Service Utilities (IFGC) . . . . . . . . . . . . . . . . . . . . . 1-6 410 Flow Controls (IFGC) . . . . . . . . . . . . . . . . . . . . . .4-48
111 Temporary Equipment, 411 Appliance and Manufactured
Systems and Uses (IFGC) . . . . . . . . . . . . . . . . . 1-6 Home Connections (IFGC) . . . . . . . . . . . . . . . .4-49
112 Inspections and Testing (IFGC) . . . . . . . . . . . . . . . 1-7 412 Liquefied Petroleum Gas Motor Vehicle
113 Means of Appeal (IFGC) . . . . . . . . . . . . . . . . . . . . 1-8 Fuel-dispensing Facilities (IFGC) . . . . . . . . . . .4-50
114 Board of Appeals (IFGC) . . . . . . . . . . . . . . . . . . . . 1-8 413 Compressed Natural Gas Motor Vehicle
Fuel-dispensing Facilities (IFGC) . . . . . . . . . . .4-51
115 Violations (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
414 Supplemental and Standby
116 Stop Work Order (IFGC) . . . . . . . . . . . . . . . . . . . . 1-9
Gas Supply (IFGC) . . . . . . . . . . . . . . . . . . . . . .4-53
415 Piping Support Intervals (IFGS) . . . . . . . . . . . . . .4-53
CHAPTER 2 DEFINITIONS . . . . . . . . . . . . . . . . . . . 2-1
416 Overpressure Protection Devices (IFGS). . . . . . . .4-53
Section
201 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
CHAPTER 5 CHIMNEYS AND VENTS . . . . . . . . . .5-1
202 General Definitions (IFGC) . . . . . . . . . . . . . . . . . . 2-1
Section
501 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
CHAPTER 3 GENERAL REGULATIONS . . . . . . . 3-1
502 Vents (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2
Section
503 Venting of Appliances (IFGS) . . . . . . . . . . . . . . . . .5-3
301 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
504 Sizing of Category I Appliance
302 Structural Safety (IFGC) . . . . . . . . . . . . . . . . . . . . 3-2 Venting Systems (IFGS) . . . . . . . . . . . . . . . . . .5-13
303 Appliance Location (IFGC) . . . . . . . . . . . . . . . . . . 3-2 505 Direct-vent, Integral Vent, Mechanical
304 Combustion, Ventilation and Vent and Ventilation/Exhaust
Dilution Air (IFGS) . . . . . . . . . . . . . . . . . . . . . . 3-3 Hood Venting (IFGC) . . . . . . . . . . . . . . . . . . . .5-17
305 Installation (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . 3-6 506 Factory-built Chimneys (IFGC). . . . . . . . . . . . . . .5-18
2021 INTERNATIONAL FUEL GAS CODE® xiii
, TABLE OF CONTENTS
CHAPTER 6 SPECIFIC APPLIANCES . . . . . . . . . . 6-1 634 Gaseous Hydrogen Systems (IFGC) . . . . . . . . . . .6-11
Section 635 Outdoor Decorative Appliances (IFGC) . . . . . . . .6-11
601 General (IFGC). . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
602 Decorative Appliances for Installation CHAPTER 7 GASEOUS HYDROGEN
in Fireplaces (IFGC). . . . . . . . . . . . . . . . . . . . . . 6-1 SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . .7-1
603 Log Lighters (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-1 Section
604 Vented Gas Fireplaces 701 General (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1
(Decorative Appliances) (IFGC) . . . . . . . . . . . . 6-1 702 General Definitions (IFGC) . . . . . . . . . . . . . . . . . . .7-1
605 Vented Gas Fireplace Heaters (IFGC) . . . . . . . . . . 6-1 703 General Requirements (IFGC). . . . . . . . . . . . . . . . .7-1
606 Incinerators and Crematories (IFGC). . . . . . . . . . . 6-1 704 Piping, Use and Handling (IFGC) . . . . . . . . . . . . . .7-2
607 Commercial-industrial Incinerators (IFGC). . . . . . 6-1 705 Testing of Hydrogen Piping Systems (IFGC) . . . . .7-3
608 Vented Wall Furnaces (IFGC) . . . . . . . . . . . . . . . . 6-1 706 Location of Gaseous
609 Floor Furnaces (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-2 Hydrogen Systems (IFGC) . . . . . . . . . . . . . . . . .7-4
610 Duct Furnaces (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-2 707 Operation and Maintenance of Gaseous
Hydrogen Systems (IFGC) . . . . . . . . . . . . . . . . .7-4
611 Nonrecirculating Direct-fired Industrial
708 Design of Liquefied Hydrogen Systems
Air Heaters (IFGC). . . . . . . . . . . . . . . . . . . . . . . 6-2
Associated with Hydrogen Vaporization
612 Recirculating Direct-fired Industrial Air Operations (IFGC) . . . . . . . . . . . . . . . . . . . . . . . .7-4
Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
613 Clothes Dryers (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-3 CHAPTER 8 REFERENCED STANDARDS . . . . . . .8-1
614 Clothes Dryer Exhaust (IFGC). . . . . . . . . . . . . . . . 6-3
615 Sauna Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-5 APPENDIX A SIZING AND CAPACITIES OF
616 Engine and Gas Turbine-powered GAS PIPING (IFGS) . . . . . . . . . . . . . A-1
Equipment (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-6 Section
617 Pool and Spa Heaters (IFGC). . . . . . . . . . . . . . . . . 6-6 A101 General Piping Considerations . . . . . . . . . . . . . . . A-1
618 Forced-air Warm-air Furnaces (IFGC). . . . . . . . . . 6-6 A102 Description of Tables . . . . . . . . . . . . . . . . . . . . . . A-1
619 Conversion Burners (IFGC) . . . . . . . . . . . . . . . . . . 6-7 A103 Use of Capacity Tables . . . . . . . . . . . . . . . . . . . . . A-4
620 Unit Heaters (IFGC). . . . . . . . . . . . . . . . . . . . . . . . 6-7 A104 Use of Sizing Equations . . . . . . . . . . . . . . . . . . . . A-6
621 Unvented Room Heaters (IFGC) . . . . . . . . . . . . . . 6-7 A105 Pipe and Tube Diameters . . . . . . . . . . . . . . . . . . . A-7
622 Vented Room Heaters (IFGC) . . . . . . . . . . . . . . . . 6-8 A106 Examples of Piping System Design and
623 Cooking Appliances (IFGC) . . . . . . . . . . . . . . . . . 6-8 Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
624 Water Heaters (IFGC) . . . . . . . . . . . . . . . . . . . . . . 6-8
APPENDIX B SIZING OF VENTING SYSTEMS
625 Refrigerators (IFGC) . . . . . . . . . . . . . . . . . . . . . . . 6-9 SERVING APPLIANCES
626 Gas-fired Toilets (IFGC) . . . . . . . . . . . . . . . . . . . . 6-9 EQUIPPED WITH DRAFT
627 Air-conditioning Appliances (IFGC) . . . . . . . . . . . 6-9 HOODS, CATEGORY I
APPLIANCES AND
628 Illuminating Appliances (IFGC) . . . . . . . . . . . . . 6-10
APPLIANCES LISTED
629 Small Ceramic Kilns (IFGC) . . . . . . . . . . . . . . . . 6-10 FOR USE WITH TYPE B
630 Infrared Radiant Heaters (IFGC) . . . . . . . . . . . . . 6-10 VENTS (IFGS) . . . . . . . . . . . . . . . . . . B-1
631 Boilers (IFGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 Section
632 Equipment Installed in Existing B101 Examples Using Single-appliance
Unlisted Boilers (IFGC) . . . . . . . . . . . . . . . . . . 6-10 Venting Tables . . . . . . . . . . . . . . . . . . . . . . . . . B-1
633 Stationary Fuel-cell Power Systems (IFGC) . . . . 6-11 B102 Examples Using Common Venting Tables. . . . . . B-4
xiv 2021 INTERNATIONAL FUEL GAS CODE®
