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9.33.4.3.(1)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Protection from freezing of equipment that forms part of a heating or air-conditioning system serving only one dwelling unit, that may be adversely affected by freezing temperatures, and that is located in an unheated area, 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 that components of heating or air-conditioning systems will become inoperative or will perform significantly below expectations, which could lead to an inability to maintain adequate indoor air temperatures.
This is to limit the probability of condensation, which could lead to:
  • 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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