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9.32.3.4.(6) | Application | Intent |
| OH1 | OS3 | OS2 |
| Objective | OS3 Safety in Use |
| Attribution | |
| Application | Application 1: Flow-regulating dampers in outdoor air supply
ducts installed between the furnace and the
outdoors in self-contained heating-season mechanical ventilation systems 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 of an inability to regulate the
supply of outdoor air to the dwelling unit, which could lead to excessive
negative pressure (where supply fans alone are affected), 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 limit the probability of an inability to regulate the
supply of outdoor air to the dwelling unit during cold weather, which could
lead to thermal shock to the heat exchanger, which could lead to premature
failure or cracking of the heat exchanger, which could lead to the leakage
of carbon monoxide gas into living spaces, which could lead to the acute poisoning
or asphyxiation of persons. |
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