ATLANTA, GA — The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has published ANSI/ASHRAE Standard 34-2001, “Designation and Safety Classification of Refrigerants.”

“The standard establishes a simple means of referring to common refrigerants in place of chemical names, formulas or trade names,” the society states. “It also establishes safety classifications based on toxicity and flammability data.”

“The standard now contains all addenda in one document, which makes it more convenient and easier to use,” said Steve Szymurski, chair of the Standard 34 committee.

Five new addenda — 34m, 34n, 34r, 34s, and 34t — add designations and safety classifications for R-414B, -416A, and -417A; change the safety classification of R-245fa to B1; and change the composition tolerances for R-402A and -402B.

To order, contact ASHRAE Customer Service, 800-527-4723 (U.S. and Canada) or 404-636-8400 (worldwide); 404-321-5478 (fax); or visit (website).

Publication date: 01/21/2002