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6.2.3.15.(1)
ApplicationIntent
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F81,F44-OH1.1]
Application
Application 1: 
Location and installation of fans for heating, ventilating and air-conditioning systems, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to:
  • mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2),
  • the ventilation of storage garages for more than 4 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3),
  • the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2),
  • heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
  • air duct distribution systems serving heating systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
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Intent
Intent 1: 
To limit the probability that an inappropriate location or installation of fans will lead to:
  • zones of depressurization in the building, which could lead to the spillage of combustion products from fuel-fired appliances, and
  • the distribution of contaminants that might be present in boiler or furnace rooms by entraining them in the air being circulated in ductwork serving the building.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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