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6.2.3.8.(5)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Discharge location of exhaust ventilating systems serving 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:
Exceptions: 
except as stated in Sentence 6.2.3.8.(6), which applies to exhaust systems serving rooms that are accessible only from a storage garage and are not served by duct systems serving other parts of the building.
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Intent
Intent 1: 
To limit the probability that:
  • pollutants or water vapour will not be removed from the building, or
  • when an exhaust system is not in operation and conditions of positive wind or stack effect pressure exist, airborne contaminants (e.g. exhaust fumes from a parking garage) will enter 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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