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9.32.3.5.(6)
OH1OS2OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Airflow measurement and adjustment of flow-regulating dampers in outdoor air supply ducts in self-contained heating-season mechanical ventilation systems that are not coupled to forced air heating 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 the outdoor air supply flow will not be equal to the normal operating exhaust capacity of the principal ventilation fan, which could lead to:
  • excessive negative pressure, or
  • excessive positive pressure.
This is to limit the probability of:
  • where there is excessive negative pressure:
    • the ingress of soil gases (such as methane and radon),
    • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage, or
    • moisture ingress from the ground, or
  • where there is excessive positive pressure, condensation within assemblies.
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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