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3.4.2.3.(1)
ApplicationIntent
OS1
ObjectiveOS1 Fire Safety
Attribution
[F10,F05-OS1.5]
Application
Application 1: 
Minimum distance between 2 required exits from floor areas that are intended for occupancies, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to:
  • the minimum distance between stairs serving a roof intended for an occupant load more than 60, as stated in Sentence 3.3.1.3.(4), 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 to be located above the first storey on any building,
  • Sentence 3.1.6.2.(2), which prohibits air-supported structures to be 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 3.4.2.3.(2), which applies to measurement, for the purpose of applying Clauses 3.4.2.3.(1)(a) and (b), of the minimum distance between 2 required exits from a floor area that is intended for occupancy,
  • 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 limit the probability that exits will be located too close to one another, which could lead to persons not having a choice of an alternative egress route in the event that one route to the exits is blocked or obstructed in a 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.
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