HVAC Systems · Refrigeration — Refrigerants & ASHRAE 34

Safety Group Classification

The ASHRAE 34 two-character code for a refrigerant: a letter for toxicity (A = lower, B = higher) and a number for flammability (1 = none, 2L = mild, 2 = flammable, 3 = higher flammability). Example: R-410A is A1, R-32 is A2L.

Common uses

Determining handling, storage, and machinery-room requirements

Related terms

• ASHRAE Standard 34
• A2L Refrigerant
• Toxicity Class
• Flammability Class