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5.4.1.2.(3)
ApplicationIntent
OH1OS2OS1
ObjectiveOS1 Fire Safety
Attribution
[F61,F51,F63-OS1.4] Applies where required life safety systems are incorporated in environmental separators.
Application
Application 1: 
Joints and junctions in air barrier systems and penetrations through air barrier systems in, and at interfaces between, building assemblies 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 5.4.1.1.(3), which applies where a lack of resistance to air leakage 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 the inadequate control of:
  • total heat loss or gain due to air mass transfer,
  • airborne vapour transfer from the interior above ground and from the exterior below ground, or
  • precipitation ingress due to air pressure differences.
This is to limit the probability of compromised operation of temperature-sensitive or moisture-sensitive life safety systems, which could lead to harm to persons.
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