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9.32.3.7.(5)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Location of the intake for supplemental exhaust fans installed in kitchens.
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)].
Exceptions: 
except:
  • for range hoods or range -top fans, and
  • 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 vapours and pollutants produced by cooking will not be captured.
This is to limit the probability of the inadequate control of:
  • airborne pollutants and vapours, or
  • relative humidity, which could lead to condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
To exempt range hood and range-top fans in kitchens from the requirement to locate the fan intake on or near the ceiling, on the basis that the range hood or range-top fan intakes capture cooking vapours and pollutants before they can disperse and rise towards the ceiling.
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