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9.32.3.11.(9)
ApplicationIntent
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F50,F52,F53-OH1.1]
Application
Application 1: 
Sizing of ducts, 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:
  • where the size of ducts can be determined using Table 9.32.3.11.A. or 9.32.3.11.B., in which case the Tables are to be used to determine the duct size, 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 of:
  • where both exhaust and supply ducts are undersized, inadequate ventilation,
  • where supply ducts alone are undersized, excessive negative pressure, or
  • where exhaust ducts alone are undersized, excessive positive pressure.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or oxygen and other components necessary for breathable air,
  • the inadequate control of relative humidity, which could lead to condensation on interior surfaces,
  • condensation within assemblies,
  • moisture ingress from the ground,
  • the ingress of soil gases (such as methane and radon), or
  • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • pollutant ingress (including combustion products and soil gases).
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 Subsection 9.33.4. to ducts in residential occupancies where the size of a duct cannot be determined using Table 9.32.3.11.A. or 9.32.3.11.B.
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