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9.32.3.8.(4)
ApplicationIntent
OS3OH1
ObjectiveOS3 Safety in Use
Attribution
[F81-OS3.4]
Application
Application 1: 
Introduction and minimum temperature of outdoor makeup air for any mechanical air-exhausting device, in dwelling units that:
This applies to self-contained 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 requirements for outdoor makeup air in Article 9.32.3.8. where a test performed in accordance with the procedures in CAN/CGSB-51.71 indicates that the maximum depressurization levels will not exceed 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 that occupants will disable outdoor air supply fans, which could lead to excessive negative pressure, which could lead to the spillage of carbon monoxide gas from fuel-burning appliances that are susceptible to spillage, which could lead to the acute poisoning or asphyxiation of persons.
Intent 2: 
To exempt mechanical air exhausting devices that are principal ventilation fans operating at a rate not greater than the maximum permitted in Table 9.32.3.3. from the provisions in Article 9.32.3.8. for outdoor make-up air fans, on the basis that Articles 9.32.3.4. and 9.32.3.5. address outdoor make-up air for the principal ventilation fan.
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