9.32.3.8.(5)

Objective

OS3 Safety in Use

Attribution

Intent

Intent 1:

To limit the probability of the premature failure of 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 supply fans from the requirement to be approved to handle untempered outdoor air, in situations where the outdoor makeup air is tempered before it reaches the supply fan.

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