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3.4.6.10.(2)
OS3OS3
ObjectiveOS3 Safety in Use
Attribution
[F30-OS3.1] [F10-OS3.7] Applies to portion of Code text: “No exit door shall open directly onto a step …”
Application
Application 1: 
Exit doors opening directly onto a step.
This applies, in buildings described in Sentence 1.3.3.2.(1) of Division A, to:
Application 2: 
This also applies to:
Exceptions: 
except:
  • if there is a danger of blockage from ice or snow,
  • 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 3.3.1.3.(5), which applies to rooftop enclosures,
  • as stated in 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
  • as stated in 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 a person will step through the door down onto a step, which could lead to the person falling, which could lead to harm to the person.
Intent 2: 
To limit the probability that a person will step through the door down onto a step in an emergency situation, which could lead to the person falling or obstructing other persons using the exit, 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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