ARCHIVED - 9.32.3.10.(3)

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9.32.3.10.(3)


Objective	OS3 Safety in Use
Attribution	[F53-OS3.4]
Application	Application 1: Static pressure differentials for rating the capacity of fans, in 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 9.32.3.1.(1), which applies to heating-season mechanical ventilation systems designed to comply with CAN/CSA-F326-M, and Sentence 9.32.3.10.(4), which applies to heat recovery ventilators used to provide one or more required fans.
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Intent	Intent 1: To limit the probability that the airflow resistance of ducts will not be taken into account, which could lead to fans performing significantly below the required capacity, which could lead to an inadequate volume of makeup air, which could lead to excessive negative pressure in dwelling units, 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.
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