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3.2.8.7.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Location and minimum depth of draft stops around openings into interconnected floor spaces.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A that contain portions of a floor area or mezzanines that do not terminate at an exterior wall, a firewall or a vertical shaft, and are required by Clause 3.2.8.1.(1)(b) to be protected in conformance with Articles 3.2.8.3. to 3.2.8.9.
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], where there are:
  • openings through floors that are not protected by shafts or closures, as stated in Sentence 9.10.1.2.(6), or
  • interconnected floor spaces, as stated in Sentence 9.10.9.5.(1).
Exceptions: 
except as exempted in:
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Intent
Intent 1: 
To limit the probability that smoke and heat from a fire in a storey adjacent to a floor opening will migrate into the interconnected floor space and bypass sprinklers and smoke detectors without actuating them, which could lead to:
  • the fire not being controlled or suppressed, which could lead to the spread of fire, which could lead to harm to persons,
  • persons not being promptly notified of the fire situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
  • emergency responders not being promptly notified of the fire situation, which could lead to delays or inefficiencies in carrying out fire emergency response operations, which could lead to:
    • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, and
    • the spread of fire, which could lead to harm to persons.
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