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3.4.6.16.(9)
ApplicationIntent
OS3
ObjectiveOS3 Safety in Use
Attribution
[F10,F81-OS3.7]
Application
Application 1: 
Locking of exit and egress doors for the egress of persons other than the public during times when the public is neither present nor being admitted to the area that the exit and egress facilities serve, where:
  • the doors do not lead into exit stairs,
  • the doors do not lead from exit stairs to the exterior of the building,
  • the doors do not serve any other occupancy,
  • the area served contains at least one telephone:
    • that is accessible and in operation at all times,
    • that is not coin or card operated, and
    • marked to indicate that it is for emergency use,
  • the area served is illuminated by normal power or by emergency power when the doors are locked,
  • there are provisions that enable an announcement to be made throughout the area served before the locks are fastened, and
  • the locks are designed for use during times when the building is not occupied.
This applies to exit and egress doors referred to in Sentence 3.4.6.16.(1):
  • that do not comply with Sentence 3.4.6.15.(1),
  • that comply with Sentences 3.4.6.16.(2) to (9),
  • that serve a floor area or part of a floor area used exclusively for a bank or the sale of retail merchandise, and
  • in buildings that are sprinklered throughout.
This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A, to:
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, and
  • 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).
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Intent
Intent 1: 
To supersede the requirements of Sentence 3.4.6.16.(5) that doors be readily openable and permit locked doors if certain measures are taken.
This is to limit the probability that persons will be trapped in a floor area 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.
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