9.32.3.8.(4)

Objective

OS3 Safety in Use

Attribution

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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