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9.32.3.4.(12)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Connections between ventilation systems and heating systems, in self-contained heating-season mechanical ventilation systems 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 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 connections of the ventilation system to the heating system will lead to malfunction of the heating system, which could lead to the inadequate thermal comfort of occupants, which could lead to harm to persons.
Intent 2: 
To direct Code users to Articles 9.33.4.1. and 9.33.5.2. for requirements dealing with the installation of heating and air-conditioning equipment.
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