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Interior finish materials shall be grouped in the following classes in accordance with their flame spread and smoke-developed index where tested in accordance with ASTM E 84.

Class A: flame spread index 0—25; smoke-developed index 0—450.

Class B: flame spread index 26—75; smoke-developed index 0—450.

Class C: flame spread index 76—200; smoke-developed index 0—450.

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