ASHRAE 34
Designation and Safety Classification of Refrigerants
Published by American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)
The CFR incorporates ASHRAE 34 by reference, which makes the edition it names part of the regulation. The CFR requires the edition it names, which may not be the newest. To enforce any other edition, the agency must publish the change in the Federal Register.
The 2 editions the CFR requires
Different parts name different editions; each applies where its part says so. Newest first.
ASHRAE 34-2024, copyright 2024, including addenda approved through August 30, 2024
As the CFR lists it: “ANSI/ASHRAE Standard 34-2024, Designation and Safety Classification of Refrigerants, copyright 2024, including addenda approved through August 30, 2024”
ASHRAE 34-78, approved 1978
As the CFR lists it: “ANSI/ASHRAE 34-78, Number Designation of Refrigerants (approved 1978), (“ANSI/ASHRAE 34-78”)”
- Listed in 46 CFR 147.7(c)(1); required by46 CFR 147.90 ↗
How to read it
- Where to get itASHRAE website ↗
The web address the CFR prints for this publisher.
A free or purchased copy may not be the edition the CFR names; check it against the edition above. Every incorporated standard can also be inspected at the National Archives (NARA) and at the agency named in the section that lists it.
ASHRAE 34 is copyrighted by its publisher; RegKnot shows its title and the editions the CFR names, not its text. Read from the eCFR's incorporation-by-reference sections, current as of October 26, 2026. The regulation text governs. All standards the CFR requires.