2021 International Fuel Gas Code – IFGC-2021

The 2021 International Fuel Gas Code® (IFGC) provides comprehensive requirements for the design and installation of fuel gas systems in residential, commercial, and industrial buildings. It governs piping, appliances, combustion air, chimneys, vents, and gaseous hydrogen systems, ensuring safe and efficient fuel gas usage across all occupancies. Fully aligned with the 2021 I-Code suite.

Highlights:

• Regulates natural gas systems up to 125 psig and LP-gas up to 20 psig from point of delivery to appliance shutoff
• Includes complete standards for gaseous hydrogen systems in Chapter 7
• Covers installation, combustion air, and venting for a wide range of fuel gas appliances
• Supports both prescriptive and engineered design methods for air supply, venting, and pipe sizing
• Provides appendices for gas pipe and vent sizing, inspection procedures, and appeals processes
• References updated technical standards from ASME, ANSI, AGA, CSA, and NFPA
• Revised administration chapter clarifies enforcement roles, jurisdictional edits, and appeals

Who It’s For:
Mechanical engineers, gas system designers, inspectors, code officials, and utility providers responsible for safe and compliant gas system installations.

IFGC-2021