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9.32.3.2.(3)
ApplicationIntent
OH1OS3
ObjectiveOS3 Safety in Use
Attribution
[F81-OS3.4]
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 disabling the supply fans, which could lead to excessive negative pressure (where supply fans alone are disabled), which could lead to the spillage of carbon monoxide gas from fuel-burning appliances that are susceptible to spillage, which could lead to the acute poisoning or asphyxiation of 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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