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9.32.3.2.(3)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Isolation of fans and heat recovery ventilators from structural components, in 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:
  • where fans and heat recovery ventilators are mounted on concrete foundations, 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 of the transmission of excessive noise or vibration, which could lead to occupants not using the fans or disabling them, which could lead to inadequate ventilation, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
To exempt fans and heat recovery ventilators fixed only to a concrete base from the requirement to install resilient mountings, on the basis that concrete is unlikely to transmit vibration generated by the equipment to occupied space.
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