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5.3.1.2.(2)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F63-OH1.1]
Application
Application 1: 
Metal-framed glazed assemblies separating interior conditioned space from interior unconditioned space or exterior space that are installed to provide resistance to heat transfer 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 5.3.1.2.(3), which applies to:
  • 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: 
To limit the probability of the inadequate control of heat transfer through metal-framed glazing assemblies under expected environmental loads, which could lead to condensation.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • deterioration, which could lead to compromised integrity of the separators.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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