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9.33.4.1.(1)
ApplicationIntent
OH1OS2OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F41,F63-OH1.1] [F51,F52-OH1.2]
Application
Application 1: 
Design, construction and installation of heating and air-conditioning systems, 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 or air-conditioning systems, with respect to maintaining indoor air temperatures and relative humidity, will fall significantly below expectations.
This is to limit the probability of the inadequate control of temperatures and relative humidity, which could lead to condensation, which could lead to:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of building elements.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, or
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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