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9.9.9.3.(1)
OS3
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Number and separation of means of egress from dwelling units, where egress doors from dwelling units open onto:
  • an exit stairway serving more than one suite,
  • a public corridor serving more than one suite and served by a single exit stairway,
  • an exterior passageway more than 1.5 m above adjacent ground level, serving more than one suite and served by a single exit stairway, or
  • a balcony more than 1.5 m above adjacent ground level, serving more than one suite and served by a single exit stairway.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that persons will not have access to an alternative egress route in the event one route is blocked or obstructed 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.
Intent 2: 
To supersede the requirements of Sentence 9.9.7.2.(1), which would otherwise permit a single exit or doorway from a suite.
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