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Foam board in cold air return?


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This is a cold air return with foam insulation board used to block electrical wires in the stud cavity of a 3 year old home. Logic tells me this is not correct and the only code reference I can find is: M1601.2.1 Duct insulation materials.

Duct insulation materials shall conform to the following requirements:

1. Duct coverings and linings shall have a flame-spread index not greater than 25, and a smoke-developed index not greater than 50 when tested in accordance with ASTM E 84. Specimens tested in accordance with ASTM E 84 shall be representative of the final composite material.

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Does this apply or is there a better code reference?


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