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BC § 804.2
Interior floor finish and floor covering materials required by Section 804.4.1 of this code to be of Class I or II materials shall be classified in accordance with NFPA 253 or ASTM E 648. The classification referred to herein corresponds to the classifications determined by NFPA 253 or ASTM E 648 as follows: Class I, 0.45 watts/cm 2 or greater; Class II, 0.22 watts/cm 2 or greater.
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