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3.1.9.4.(5)
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Application
Application 1: 
Combustible drain piping that penetrates a horizontal fire separation where the piping leads directly from a noncombustible water closet through a concrete floor slab, in buildings described in Sentence 1.3.3.2.(1) of Division A.
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Intent
Intent 1: 
To exempt combustible drain piping from the application of Sentences 3.1.9.2.(1) and 3.1.9.4.(3) if certain conditions are met, on the basis that the imposed conditions limit the probability of the spread of fire or smoke.
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