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3.4.6.9.(2)
ApplicationIntent
OS3
ObjectiveOS3 Safety in Use
Attribution
[F10-OS3.7]
Application
Application 1: 
Minimum clear width of vestibules, enclosed balconies or bridges, where the vestibules, enclosed balconies or bridges are used as parts of a horizontal exit.
This applies:
  • in buildings described in Sentence 1.3.3.2.(1) of Division A, to:
  • to horizontal exits in 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 9.9.2.1.(3).
Application 2: 
This also applies to:
  • ramps, stairways and passageways used by the public as access to exits, as stated in Appendix Note A-3.4.6., and
  • tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).
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,
  • Sentence 3.3.1.3.(5), which applies to rooftop enclosures,
  • Sentence 3.4.2.2.(2), which applies to mezzanines that:
    • are not required to terminate at a vertical fire separation [see Article 3.2.8.1.],
    • are not intended for an occupant load more than 60,
    • do not exceed the area limits for rooms and suites in Table 3.4.2.2., and
    • have limited travel distances to egress doors or stairs,
  • Sentence 3.4.2.2.(3), which applies to at least half of the required means of egress from a mezzanine if the mezzanine is not required to terminate at a fire separation as permitted by Sentence 3.2.8.2.(1), 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 vestibules, enclosed balconies or bridges that are used as parts of a horizontal exit 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 supersede the requirement for a minimum clear width in the first part of Sentence 3.4.6.9.(2) and permit the projection of handrails into this clear width, if the projection of the handrails is limited.
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