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9.10.13.13.(3)
ApplicationIntent
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Application
Application 1: 
Fire dampers in noncombustible branch ducts that pierce required fire separations around exhaust duct risers in which the air flow is upward, where:
  • the melting point of the branch ducts is not below 760°C,
  • the branch ducts are carried up inside the risers not less than 500 mm, and
  • the exhaust ducts are under negative pressure as described in Article 9.10.9.18.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To exempt certain branch ducts from the requirements of Sentence 9.10.13.13.(1), which would otherwise require fire dampers to be installed, on the basis that:
  • the ducts are capable of withstanding high temperatures,
  • it is unlikely that hot gases will contact combustible building components, and
  • the lack of dampers in this case will not contribute significantly to the spread of fire.
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