The purpose of this fact sheet is to provide an update on ASHRAE standards for refrigerants and to introduce the new refrigerants that have been awarded an «R» number over the last few years and introduced into the international market.
ASHRAE Standard 34, Designation and Safety Classification of Refrigerants, establishes a simple means of referring to common refrigerants rather than by their chemical name, formula, or trade name.
ASHRAE assigns numbers and safety classification to the refrigerants based on toxicity and flammability data submitted by the refrigerant’s producer. For pure compounds, the numbers are based on chemical formula.
For blends, numbers are assigned sequentially based on the completion of a satisfactory review of data provided by the refrigerant’s producer. Information is available in the current edition, ANSI/ASHRAE Standard 34-2022.
Download Update on New Refrigerants Designations and Safety Classifications - July 2024
