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3.6.5.8.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F02-OS1.2]
Application
Application 1: 
Maximum flame-spread rating of material used to construct return ducts, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to:
  • the fire safety characteristics of heating, ventilating and air-conditioning systems, as stated in Article 6.2.1.2., and
  • buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to:
    • mechanical ventilation systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.1.(2)
    • the ventilation of storage garages for more than 5 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3),
    • mechanical ventilation systems used for the ventilation of rooms and spaces in dwelling units during the non-heating season, where natural ventilation is not provided in accordance with Article 9.32.2.2., as stated in Clause 9.32.2.1.(1)(b),
    • heating and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
    • air duct distribution systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
Exceptions: 
except as exempted in:
  • Sentence 3.6.5.8.(2), which applies to return ducts directly above or within 600 mm of the outside furnace casing, and
  • Sentence 3.6.5.8.(3), which applies to return ducts serving solid-fuel-fired furnaces.
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Intent
Intent 1: 
To limit the probability that material used to construct return ducts will have inappropriately high flame-spread properties, which could lead to the spread of fire across the exposed surfaces of the ducts, which could lead to the spread of fire to other parts of the building, which could lead to harm to persons.
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