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3.2.6.2.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Design, with respect to limiting the buildup of smoke in the exit stairs in a fire situation, of exit stairs serving storeys below the lowest exit level, and the design of fire emergency and smoke control systems for such exit stairs.
This applies to high buildings, as defined in Sentence 3.2.6.1.(1):
Application 2: 
This also applies to vestibules required to protect an exit opening into an interconnected floor space, as stated in Clause 3.2.8.5.(1)(c).
Application 3: 
This also applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], as stated in Sentence 9.10.9.5.(1).
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Intent
Intent 1: 
To limit the probability that smoke will build up in the exit stairs in a fire situation during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to:
  • delays or inefficiencies in fire suppression operations, which could lead to the spread of fire, which could lead to harm to persons, including emergency responders, and
  • delays in evacuation or moving to a safe place, which could lead to harm to persons.
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