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6.2.3.11.(2)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Interlocking of make-up air facilities with the exhaust devices they serve, for ventilating systems that exhaust air to the outdoors, 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:
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Intent
Intent 1: 
To limit the probability that exhaust systems will operate without the introduction of make-up air, which could lead to the depressurization of occupied space from which air is being exhausted, which could lead to:
  • a reduction in exhaust air volume, which could lead to inadequate ventilation, or
  • the entry of combustion products from fuel-fired appliances into 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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