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9.32.3.5.(9)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Installation of tempering devices in self-contained heating-season mechanical ventilation systems that are not coupled to forced air heating 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:
  • where heat recovery ventilators are used to introduce outdoor air, 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 tempering devices will not function properly, which could lead to incoming cold outdoor air being distributed by the ductwork, which could lead to drafts, which could lead to the inadequate thermal comfort of persons, which could lead to harm to persons.
Intent 2: 
To expand the application of Articles 9.33.4.1. and 9.33.5.2. to the installation of duct heaters, heating coils, or other air-tempering devices for mechanical ventilation systems within the scope of Section 9.32.
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