ARCHIVED - 9.32.3.2.(4)

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9.32.3.2.(4)


Objective	OH1 Indoor Conditions
Attribution	[F40,F43,F50,F53-OH1.1]
Application	Application 1: Adjustability, accessibility, and position indicator of required flow-regulating dampers 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.
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Intent	Intent 1: To limit the probability that the dislodgement of flow-regulating dampers will go unnoticed and unrectified, which could lead to an inability to regulate the airflow in ventilation systems, which could lead to: when the damper is closed, inadequate ventilation or excessive negative pressure, and when the damper is fully open in cold weather, thermal shock to heat exchangers. This is to limit the probability of: the inadequate control of airborne pollutants, or oxygen and other components necessary for breathable air, the inadequate control of relative humidity, which could lead to condensation on interior surfaces, where there is excessive negative pressure: 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, or cracking or premature failure of heat exchangers, which could lead to the leakage of combustion gases into living space. 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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