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9.33.4.1.(1)
ApplicationIntent
OH1OS2OS3
ObjectiveOS3 Safety in Use
Attribution
[F44-OS3.4] Applies only to heating systems.
Application
Application 1: 
Design, construction and installation of heating, including ducting, and mechanical heating equipment serving only one dwelling unit, for buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to:
  • the sizing of single or multiple exhaust ducts serving principal exhaust fans, as stated in Sentence 9.32.3.4.(8), and
  • the sizing of exhaust ducts serving required kitchen, bathroom, water-closet room and other supplemental exhaust fans, as stated in Sentence 9.32.3.5.(5).
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Intent
Intent 1: 
To limit the probability that the performance of heating equipment, with respect to the spillage of combustion products from fuel-burning appliances that are susceptible to spillage, will fall significantly below expectations, which could lead to the entry of carbon monoxide gas into living space, which could lead to the acute poisoning or asphyxiation of persons.
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