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9.32.3.11.(3)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F63-OH1.1]
Application
Application 1: 
Insulation of exhaust ducts that:
  • pass through an unheated space, or
  • are not separated from an unheated space by an insulated building assembly.
This applies to self-contained heating-season mechanical ventilation systems serving single dwelling units with 5 or fewer bedrooms that are supplied with electrical power and a heating system, in buildings to which:
  • Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], or
  • Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6 and Sentence 6.2.2.1.(3)].
Exceptions: 
except as stated in Sentence 9.32.3.1.(1), which applies to heating-season mechanical ventilation systems designed to comply with CAN/CSA-F326-M.
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Intent
Intent 1: 
To limit the probability that water vapour will condense on the interior surface of exhaust ducts, which could lead to:
  • the deterioration of ducts, which could lead to the blockage of ducts (e.g. ducts collapsing due to corrosion), which could lead to inadequate ventilation, or
  • the generation of pollutants from biological growth.
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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