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3.3.2.5.(2)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Minimum clear width of aisles leading to exits, in places of assembly that contain fixed seats.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A.
Exceptions: 
except where the aisles:
  • serve not more than 60 seats, or
  • serve seats on one side only.
Application 2: 
This also applies to:
  • tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1), and
  • 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 9.10.1.2.(2).
Exceptions: 
except as stated in:
  • Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • Sentence 3.1.6.2.(2), which prohibits air-supported structures from being used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies,
  • Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction,
  • Article 3.3.2.10., which applies to outdoor places of assembly,
  • Article 3.3.2.11., which applies to bleachers of the telescopic type, and
  • Sentence 3.8.1.3.(1), which applies to barrier-free design in buildings described in Sentence 3.8.1.1.(1).
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Intent
Intent 1: 
To limit the probability that aisles will be of insufficient width to permit efficient egress in an emergency situation, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 2: 
To exempt aisles from the minimum width of 1 100 mm required in the first part of Sentence 3.3.2.5.(2) on the basis that they serve a limited number of seats.
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