16 CFR Appendix G1 to Part 305 - Appendix G1 to Part 305—Furnaces—Gas

Appendix G1 to Part 305—Furnaces—Gas
Furnace type Range of annual fuel utilization efficiencies
(AFUEs)
Low High
Non-Weatherized Gas Furnaces—All Capacities 80.0 99.0
Weatherized Gas Furnaces—All Capacities 81.0 95.0
[87 FR 61475, Oct. 12, 2022]