9.10.13.13.(4)

Intent

Intent 1:

To exempt certain 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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