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9.32.3.2.(4) | Application | Intent |
| OH1 | OS3 |
| Objective | OS3 Safety in Use |
| Attribution | |
| 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:
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 flow-regulating dampers will
create too small an opening, 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 that flow-regulating dampers will
create too large an opening during cold weather, which could lead to thermal
shock to heat exchangers, which could lead to the premature failure or cracking
of heat exchangers, 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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