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5.3.1.2.(3)
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Application
Application 1: 
Metal-framed glazed assemblies that are used as storm windows or doors, or that are required to have a fire-protection rating, and 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].
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Intent
Intent 1: 
To exempt certain glazed assemblies from the requirement for a thermal break stated in Sentence 5.3.1.2.(2), on the basis that:
  • the assemblies are installed as storm windows and doors, because in this application they act as a secondary protection against heat transfer, or
  • the assemblies are required to have a fire-protection rating and it is recognized that fire is a more serious hazard than inadequate thermal performance and that rated glazed assemblies with thermal breaks are unlikely to be available.
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