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9.10.9.18.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Venting of exhaust ducts that are located in vertical service spaces, where the exhaust ducts serve more than one fire compartment.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that smoke from a fire in one compartment will spread to another compartment by means of the exhaust ducts, which could lead to harm to persons in the other compartment.
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