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3.2.6.2.(4)


Objective	OS1 Fire Safety
Attribution	[F03-OS1.2,OS1.5]
Application	Application 1: Design, with respect to limiting the movement of smoke from a fire in a floor area below the lowest exit storey into upper storeys, of buildings. This applies to high buildings, as defined in Sentence 3.2.6.1.(1): of Group A, D, E or F major occupancy classification that are more than 36 m high, measured between grade and the floor level of the top storey, or 18 m high, measured between grade and the floor level of the top storey, and in which the cumulative or total occupant load on or above any storey above grade, other than the first storey, divided by 1.8 times the width in metres of all exit stairs at that storey, exceeds 300, containing a Group B major occupancy in which the floor level of the highest storey of that major occupancy is more than 18 m above grade, containing a floor area or part of a floor area located above the third storey designed or intended as a Group B, Division 2 occupancy, and containing a Group C major occupancy whose floor level is more than 18 m above grade.
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Intent	Intent 1: To limit the probability that smoke will migrate from a floor area below the lowest exit storey into upper storeys in a fire situation during the time required to achieve occupant safety and for emergency responders to perform their duties, which could lead to: delays or inefficiencies in fire suppression operations, which could lead to the spread of fire, which could lead to harm to persons, including emergency responders, and delays in evacuation or moving to a safe place, which could lead to harm to persons.
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