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9.32.3.5.(4) | Application | Intent |
OH1 | OS3 |
Objective | OS3 Safety in Use |
Attribution | |
Application | Application 1: Connection of outdoor air supply fans to the outdoors,
in self-contained heating-season mechanical ventilation systems that are not
coupled to forced air heating systems, serving single dwelling
units with 5 or fewer bedrooms that are supplied with electrical power
and a heating system, in buildings to which:
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 outdoor air supply flow
will not be equal to the normal operating exhaust capacity of the principal
ventilation fan, which could lead to excessive depressurization of dwelling
units by exhaust fans, which could lead to the spillage of combustion products
from fuel-burning appliances that are susceptible to spillage.
This is to limit the probability of the entry of carbon monoxide
gas into living space, which could lead to the acute poisoning or asphyxiation
of persons.
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