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9.33.6.13.(2)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F63-OH1.1] [F51-OH1.2]
Application
Application 1: 
Provision of return-air inlets, in air duct distribution systems serving heating systems in which the rated heat input does not exceed 120 kW and 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].
Exceptions: 
except for unfinished areas and floor levels that are less than 900 mm above or below an adjacent floor level that is provided with a return-air inlet.
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Intent
Intent 1: 
To limit the probability of:
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], or
  • inadequate ventilation.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or relative humidity, or
  • condensation.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of building elements.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, or
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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