This American National Standard (ANS) is a national voluntary consensus standard developed under the auspices of the American
Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Consensus is defined by the American National Standards
Institute (ANSI), of which ASHRAE is a member and which has approved this standard as an ANS, as “substantial agreement reached
by directly and materially affected interest categories. This signifies the concurrence of more than a simple majority, but not necessarily
unanimity. Consensus requires that all views and objections be considered, and that an effort be made toward their resolution.”
Compliance with this standard is voluntary until and unless a legal jurisdiction makes compliance mandatory through legislation.
2007ASHRAE 34-2007 Designation and Safety Classification of Refrigerants
2004ASHRAE 34-2004 Designation and Safety Classification of Refrigerants (Includes ANSI/ASHRAE addenda listed in Appendix C; Addenda A@B@C@E@F@K@N@O@P@Q@R@S@ and U: 2006; 2006 SUPPLEMENT to Addenda A@B@C@E@F@K@N@O@P@Q@R@S@ and U)
2001ASHRAE 34-2001 Designation and Safety Classification of Refrigerants (Includes ANSI/ASHRAE Addenda Listed in Appendix C; Errata: February 7@ 2002; Addendum A: June 22@ 2002; Addendas B@ D and E: January 30@ 2003; Addendas F@ G and H: July 3@ 2003; Addendum C: January 30
1997ASHRAE 34-1997 Designation and Safety Classification of Refrigerants (Addendas 34a@ 34b@ 34c@ 34d@ 34e@ and 34f; January 17@1998; Addendums 34h@ 34j@ 34k@ February 5@2000; Addendums 34l@ 34o@ 34p@ June 24@2000; Addendums 34t@ 34u@ November 2000)
1992ASHRAE 34-1992 Number Designation and Safety Classification of Refrigerants (Addendum 34A-O and 34 Q-Z: 1996; 34 AB - 1996; Addenda 34 AE - 04/07/1997)