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3.1.5.15.(3) | Application | Intent |
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| Application | Application 1: Combustible ducts in a
duct system conveying only ventilation air and contained entirely within a dwelling unit, in buildings described
in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction. Application 2: This also applies to buildings to
which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application
of Part 9] that are required to be of noncombustible
construction, as stated in Sentence 9.10.6.1.(1).
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| Intent | Intent 1: To exempt combustible ducts from the requirements of Sentences 3.6.5.1.(1) and (2) if certain conditions are met, on the basis that the materials
are deemed to insignificantly contribute to fire growth and spread.
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