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9.32.3.9.(3)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Installation of carbon monoxide alarming devices in suites of residential occupancy that contain a fuel-burning appliance [see Sentence 9.32.3.8.(6) for additional requirements regarding rooms containing a solid-fuel-burning appliance].
This applies to 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)].
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Intent
Intent 1: 
To limit the probability of carbon monoxide gas entering living space undetected, which could lead to the acute poisoning or asphyxiation of persons.
Intent 2: 
To limit the probability that the carbon monoxide alarming devices will not be loud enough to wake sleeping occupants, which could lead to carbon monoxide gas entering living space undetected, which could lead to the acute poisoning or asphyxiation of persons.
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