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6.3.1.2.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Design and installation of masonry or concrete chimneys, 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 heating systems, other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2).
Exceptions: 
except as stated in Sentence 6.3.1.2.(1), which applies to rectangular masonry or concrete chimneys not more than 12 m in height that serve:
  • appliances with a combined total rated heat output of 120 kW or less, or
  • fireplaces.
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Intent
Intent 1: 
To limit the probability that the performance of chimneys will fall significantly below expectations, which could lead to radiant heat loss, which could lead to failure, which could lead to the ignition of combustible building elements, which could lead to harm to persons.
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