10 CFR § 431.76 - Uniform test method for the measurement of energy efficiency of commercial warm air furnaces.
---
identifier: "/us/cfr/t10/s431.76"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 431.76 - Uniform test method for the measurement of energy efficiency of commercial warm air furnaces."
title_number: 10
title_name: "Energy"
section_number: "431.76"
section_name: "Uniform test method for the measurement of energy efficiency of commercial warm air furnaces."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "431"
part_name: "ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 6291-6317; 28 U.S.C. 2461 note."
regulatory_source: "64 FR 54141, Oct. 5, 1999, unless otherwise noted."
cfr_part: "431"
---
# 431.76 Uniform test method for the measurement of energy efficiency of commercial warm air furnaces.
(a) *Scope.* This section prescribes the test requirements used to measure the energy efficiency of commercial warm air furnaces with a rated maximum input of 225,000 Btu per hour or more.
(b) *Testing and calculations*—(1) *Thermal efficiency.* Test in accordance with appendix A to subpart D of this part when making representations of thermal efficiency.
(2) *Thermal efficiency two.* Test in accordance with appendix B to subpart D of this part when making representations of thermal efficiency two.
[88 FR 36234, June 2, 2023]