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5.3.1.3.(2)
ApplicationIntent
OH1OS2OS1
ObjectiveOS1 Fire Safety
Attribution
[F51,F63-OS1.4] Applies where required life safety systems are incorporated in environmental separators.
Application
Application 1: 
Materials installed to provide resistance to heat transfer and air movement in, and at interfaces between, building components described in Sentence 5.1.2.1.(1) that are installed in buildings to which Part 5 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 5].
Exceptions: 
except as stated in Sentence 5.3.1.1.(2), which applies where a lack of resistance to heat transfer will not adversely affect health, safety, the intended use of the building or the operation of building services.
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Intent
Intent 1: 
Where required life safety systems are incorporated in environmental separators, to limit the probability of wind-washing or short-circuiting, which could lead to the inadequate control of heat transfer through environmental separators under expected environmental loads, which could lead to compromised operation of temperature-sensitive or moisture-sensitive life safety systems, which could lead to harm to persons.
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