What does Class A flammability mean?
The product can be used in any building, public or private, in America. To merit a Class A rating per ASTM E-84, a product must have a smoke developed rating between 0 and 450 as well as having a flame spread rating of less than 25. The ASTM E-84 is a 25-foot tunnel test measures both flame spread and smoke developed and is the same as the NFPA 255, UBC 42-1 and UL 723. The flammability classification of a material is determined by comparing the test results with standards established by the National Fire Protection Association (NFPA 701).
