Interior Finish, Class B 2
Interior Finish, Class B 2 : Materials having flame spread index 26-75, smoke developed index 0-450 when tested in accordance with NFPA 255, Standard Method of Test of Surface Burning Characteristics of Building Materials. Includes any material with a flame spread index of -25 or more but not more than 75 and with a smoke developed index of 450 or less
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