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3.4.6.10.(2)
ApplicationIntent
OS3OS3
ObjectiveOS3 Safety in Use
Attribution
[F81,F10-OS3.7] Applies where there is a danger of blockage from ice or snow.
Application
Application 1: 
Exit doors opening directly onto a step, where there is danger of blockage from ice or snow.
This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A, to:
Application 2: 
This also applies to:
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 in the first part of Sentence 3.4.6.10.(2) prohibiting exit doors from opening onto a step, on the basis that a step of limited height will minimize the danger of door blockage from ice or snow without creating an undue risk of injury or delay.
This is to limit the probability that an accumulation of ice or snow outside the door will block the door, which could lead to persons being unable to leave the building 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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