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6.2.3.8.(10)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Connection or interconnection of two or more exhaust ventilation systems, in buildings to which Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6], that serve rooms containing water closets, urinals, basins, showers or slop sinks, or rooms containing residential cooking equipment, and where:
  • the connections are made at the inlet of an exhaust fan, and all interconnected systems are equipped with suitable back pressure devices to prevent passage of odours from one system to another when the fan is not in operation, or
  • exhaust ducts discharge to a shaft that is served by an exhaust fan.
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Intent
Intent 1: 
To limit the probability that the interconnection or connection of exhaust ducts or shafts serving various areas of buildings will lead to the transfer of exhaust air containing grease or moisture to other parts of buildings, which could lead to the contamination of other spaces, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
To exempt certain exhaust systems from the application of Sentences 6.2.3.8.(8) and 6.2.3.8.(9), where safeguards are provided to avoid cross-contamination between the contents of various ducts.
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