Regulations last checked for updates: May 06, 2024

Title 16 - Commercial Practices last revised: May 02, 2024
Appendix Appendix G1 - Appendix G1 to Part 305—Furnaces—Gas
Furnace type Range of annual fuel utilization efficiencies
(AFUEs)
Low High
Non-Weatherized Gas Furnaces—All Capacities80.099.0
Weatherized Gas Furnaces—All Capacities81.095.0
[87 FR 61475, Oct. 12, 2022]
authority: 42 U.S.C. 6294.
source: 52 FR 46894, Dec. 10, 1987, unless otherwise noted.