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3.3.1.18.(2)
ApplicationIntent
OS3
ObjectiveOS3 Safety in Use
Attribution
[F30-OS3.1]
Application
Application 1: 
Maximum size of openings through guards serving:
This applies to 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:
  • where it can be shown that the size of openings does not present a hazard,
  • as stated in Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • as stated in 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,
  • as stated in 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,
  • as stated in Sentence 3.3.2.9.(4), which applies to bleacher seats and indoor and outdoor places of assembly with fixed seat, and
  • as stated in Clause 3.8.3.4.(1)(e), 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 persons [e.g. children] will push their head or body through a guard and fall or become trapped or asphyxiated, which could lead to harm to persons.
Intent 2: 
To exempt a guard from the limitation on the size of openings stated in the latter part of Sentence 3.3.1.18.(2) on the basis that it can be shown that the size of openings that exceed the limit does not present a hazard [e.g. children being able to push their head or body through a guard and falling or becoming trapped or asphyxiated].
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