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3.1.3.1.(3)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire separations between major occupancies at the vertical plane around the perimeter of an opening through a horizontal fire separation [forming an interconnected floor space] in a building conforming to the requirements of Articles 3.2.8.2. to 3.2.8.9.
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Intent
Intent 1: 
To exclude from the fire separation requirements of Sentence 3.1.3.1.(1), the plane surrounding an open space between storeys if certain design conditions are met and measures are taken [as described in Articles 3.2.8.2. to 3.2.8.9.] to:
  • provide adequate evacuation times,
  • control fuel load and fire spread, and
  • provide tenable conditions along exit routes and during evacuation and emergency response operations.
This is to limit the probability of harm to persons during a building fire.
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