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6.2.3.8.(11)
OH1OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Preventing condensation in exhaust ducts, in ventilating systems, containing air from heated spaces that pass through or are adjacent to unheated spaces, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to 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 ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2), and
  • the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2).
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Intent
Intent 1: 
To limit the probability that exhaust ducts will have inadequate thermal resistance, which could lead to the excessive cooling of exhaust ducts, which could lead to the freezing of water vapour that condenses on the interior surface of exhaust ducts, which could lead to:
  • the blockage of ducts by ice buildup when temperatures are below the freezing point, which could lead to inadequate ventilation, or
  • the growth of mould and mildew in ducts.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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