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9.10.22.2.(2)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Reduction in the vertical clearance described in Sentence 9.10.22.2.(1) for framing, finishes and cabinets located directly above the location of gas or electric ranges, where the framing, finishes and cabinets are:
  • noncombustible, or
  • protected by
    • asbestos millboard not less than 6 mm thick, covered with sheet metal not less than 0.33 mm thick, or
    • a metal hood with a 125 mm projection beyond the framing, finishes and cabinets.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To supersede the requirements of Sentence 9.10.22.2.(1) and permit a reduction in vertical clearance, if certain conditions are met.
This is to limit the probability that heat radiating from a range or from open fire will ignite nearby framing, finishes or cabinetry, which could lead to the spread of fire, which could lead to harm to persons.
Intent 2: 
To supersede the requirements stated in CSA B149.1, referred to in Sentence 9.10.22.1.(1), with regard to natural gas ranges, in cases of conflict.
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