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9.32.3.8.(3)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Activation of supply fans rated to deliver outdoor makeup air to dwelling units that:
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 9.32.3.8.(2), which exempts the principal ventilation fan operating at a rate not greater than the maximum permitted in Table 9.32.3.3. from the requirements in Article 9.32.3.8. that address the supply of outdoor makeup air to mechanical air-exhausting devices,
  • Sentence 9.32.3.8.(8), which exempts dwelling units with solid-fuel-burning appliances from the requirement for outdoor makeup air when all other fuel-fired appliances are direct-vented or mechanically vented and soil gas is not a concern,
  • Sentence 9.32.3.8.(9), which exempts dwelling units from the requirement for outdoor makeup air, where a test performed in accordance with the procedures in CAN/CGSB-51.71 indicates that the maximum depressurization levels will be within acceptable limits, and
  • 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 the operation of exhaust fans without the simultaneous operation of related makeup air fans, which could lead to excessive depressurization, which could lead to:
  • 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, 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.
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