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3.1.8.8.(2)
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Application
Application 1: 
Fire dampers in ducts penetrating vertical fire separations not required to have a fire-resistance rating, in buildings described in Sentence 1.3.3.2.(1) of Division A.
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Intent
Intent 1: 
To exempt certain ducts from the application of Sentence 3.1.8.7.(1), which would otherwise require fire dampers, on the basis that the installation of fire dampers in this case would lead to a higher level of fire-resistance at the fire damper location than that provided by the fire separation.
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