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3.4.3.3.(4)
ApplicationIntent
OS3OP1OS1
ObjectiveOS1 Fire Safety
Attribution
[F12-OS1.2]
Application
Application 1: 
Projection of handrails and construction below handrails into the required width of means of egress.
This applies to floor areas that are intended for occupancy, 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 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
  • Sentences 3.8.1.3.(1) and 3.8.3.3.(1), which apply to barrier-free design in buildings described in Sentence 3.8.1.1.(1).
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Intent
Intent 1: 
To supersede the requirements of Sentences 3.4.3.2.(8) and 3.4.3.3.(1), and permit a reduction in the width of exits resulting from handrails and construction below handrails if the width reduction is limited to a small reduction.
This is to limit the probability that an exit will be substantially reduced in width, which could lead to emergency responders being delayed in gaining access to floor areas in a fire situation, which could lead to delays or ineffectiveness in emergency response operations, which could lead to the spread of fire, which could lead to harm to persons.
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