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9.33.4.5.(1)
ApplicationIntent
OS3OH1OS1OP1
ObjectiveOH1 Indoor Conditions
Attribution
[F23-OH1.1,OH1.2]
Application
Application 1: 
Design and installation of mechanical systems and equipment serving only one dwelling unit, in 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 limit the probability of:
  • the inadequate performance or failure of mechanical equipment, ducting or piping, which could lead to an inability to maintain adequate indoor air temperatures, or
  • rupture or leakage at joints in chimneys or vents, which could lead to the ingress of combustion products or gas fumes into living space.
This is to limit the probability of:
  • the inadequate control of relative humidity,
  • the generation of pollutants from:
    • harmful micro-organisms and the media they grow on,
    • biological growth, or
    • 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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