Flammability Class
The ASHRAE 34 number denoting burning behavior: 1 = no flame propagation, 2L = mildly flammable with low burning velocity, 2 = flammable, 3 = higher flammability (e.g., propane R-290 is A3).
The ASHRAE 34 number denoting burning behavior: 1 = no flame propagation, 2L = mildly flammable with low burning velocity, 2 = flammable, 3 = higher flammability (e.g., propane R-290 is A3).