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9.32.3.11.(1)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F81-OH1.1]
Application
Application 1: 
Ventilation ducts and their fittings, in 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:
  • exhaust ducts that serve only a bathroom or water-closet room, are airtight, and are constructed of a material impervious to damage by water,
  • as provided in Sentence 9.32.3.11.(6), which applies to ducts for range hoods and range-top fans, and
  • 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 ducts will leak, which could lead to failure to completely remove pollutants or water vapour from buildings, which could lead to:
  • the discharge of pollutants into living space or into spaces that communicate with living spaces, or
  • condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
To expand the application of Section 9.33. to include ventilation ducts and their fittings installed in dwelling units.
Intent 3: 
To exempt certain exhaust ducts from the requirement to be made of noncombustible material as stated in Article 9.33.6.2., on the basis that the ducts are unlikely to contain grease or other ignitable pollutants.
Intent 4: 
To direct Code users to Sentence 9.32.3.11.(6) for requirements regarding ductwork for range hoods and range-top fans.
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