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9.21.2.1.(1)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Chimneyflues serving fireplaces or incinerators having a combined total rated heat output of 120 kW or less, where rectangular masonry or concrete chimneys are not more than 12 m in height, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to chimney flues serving fireplaces or incinerators having a combined total rated heat output of 120 kW or less, where rectangular masonry or concrete chimneys are not more than 12 m in height, in buildings to which Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6], as stated in Sentence 6.3.1.2.(1).
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Intent
Intent 1: 
To limit the probability that the powerful exhausting capacity of solid-fuel-burning fireplaces or incinerators will partially or completely overpower the draft of other fuel-burning appliances that have a less powerful draft, which could lead to combustion products escaping from these other fuel-burning appliances, which could lead to negative effects on the air quality of indoor spaces, which could lead to harm to persons.
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