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9.33.4.5.(1)
OS3OH1OS1OP1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Design and installation of mechanical systems and equipment serving only one dwelling unit, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability of:
  • the inadequate performance or failure of mechanical equipment, ducting or piping, or
  • rupture or leakage at joints in chimneys or vents.
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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