---
kind: "section"
citation: "10 C.F.R. § 431.76"
title: "10"
number: "431.76"
heading: "Uniform test method for the measurement of energy efficiency of commercial warm air furnaces."
url: "https://uscodex.org/cfr/10/431.76"
---

# §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.

## Notes

### Amendments

[88 FR 36234, June 2, 2023]

### Source

Source: 69 FR 61939, Oct. 21, 2004, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

### Source

Source: 64 FR 54141, Oct. 5, 1999, unless otherwise noted.

### Amendments

[88 FR 36234, June 2, 2023]