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3.1.8.5.(1)
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Application
Application 1: 
Determination of the fire-protection rating of closures of the same fire-protection rating installed on opposite sides of the same opening.
Exceptions: 
except where fire dampers, window assemblies and glass block are used as closures.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A, and buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] as stated in Sentence 9.10.3.1.(1).
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Intent
Intent 1: 
To clarify how the fire-protection rating for certain closures is determined.
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