| HIGHER FLAMMABILITY |
A3 R-50, R-170, R-290 R-600a, R-441a, R-1270 |
B3 R-1140 |
| LOWER FLAMMABILITY |
A2 R-142b, R-152a |
B2 R-30, R-40, R-611, R-717
|
|
A2L HFO-1234yf, HFO-1234ze |
||
| NO FLAME PROPAGATION |
A1 R-11 – R-14, R-22, R-113, R-114, R-115, R-134A, R-410A, R-449B, R-1234zd |
B1 R-10, R-21, R-123, R-764 |
|
LOWER TOXICITY |
HIGHER TOXICITY |
A2L flammable refrigerants have been written into the 2024 Fire Code, Mechanical Code, and Building Code. A2L refrigerants have lower flammability and toxicity than other classifications
A = non-toxic, 2 = flammable, L = low burning velocity — making it the second-safest refrigerant category.
Cylinder Storage Requirements: