2021 IFGC® – International Fuel Gas Code®
The 2021 International Fuel Gas Code® (IFGC®), published by the International Code Council, establishes the minimum safety requirements for the design, installation, and inspection of fuel gas systems in residential and commercial buildings.
This code regulates the safe use of natural gas and propane systems, ensuring that fuel gas piping and appliances operate safely and efficiently.
What the 2021 IFGC Covers
The IFGC includes regulations for:
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Fuel gas piping system installation
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Gas appliance installation and safety
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Combustion air requirements
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Venting systems and exhaust requirements
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Gas pressure regulation and piping sizing
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Chimneys, vents, and connectors
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Inspection and testing procedures for gas systems
These standards help protect buildings and occupants by ensuring fuel gas systems are installed according to nationally recognized safety practices.
Who This Book Is For
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Plumbers
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Gas technicians
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HVAC technicians
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Mechanical contractors
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Building inspectors
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Code enforcement officials
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Plumbing and mechanical exam candidates
Professionals working with natural gas or propane systems rely on the IFGC as a core reference for compliant installations.
Why the 2021 Edition Matters
Using the correct code cycle helps you:
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Pass licensing and certification exams
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Avoid failed inspections
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Meet local jurisdiction requirements
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Reduce safety risks on the jobsite
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Install gas systems according to industry standards
Using outdated codes can lead to inspection failures, project delays, and costly corrections.
The Standard for Fuel Gas Safety
The IFGC 2021 is a critical codebook used by contractors, inspectors, and technicians to ensure safe and compliant fuel gas installations throughout the United States.

