Interior Finish, Class A
Interior Finish, Class A : Materials having flame spread 0-25, smoke developed 0-450 when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials. Includes any material classified at 25 or less on the flame spread test scale and 450 or less on the smoke test scale when any element thereof, when tested, does not continue to propagate fire
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