ASHRAE Standard 34
The standard that assigns refrigerants their "R-" number and a two-character safety group based on toxicity and flammability. It is the source of designations like R-410A and classes like A1 or A2L.
The standard that assigns refrigerants their "R-" number and a two-character safety group based on toxicity and flammability. It is the source of designations like R-410A and classes like A1 or A2L.