StacksVerified U.S. regulatory reference

16 CFR Part 305, Appendix G4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov
TypeRange of annual fuel utilization efficiencies (AFUEs)
LowHigh
Mobile Home Gas Furnaces—All Capacities80 | 97.3

[87 FR 61475, Oct. 12, 2022]