ARCHIVED - 3.2.8.5.(1)

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3.2.8.5.(1)


Objective	OS1 Fire Safety
Attribution	[F06-OS1.2] [F05-OS1.5]
Application	Application 1: Vestibule protection of exits that open into an interconnected floor space. This applies to buildings described in Sentence 1.3.3.2.(1) of Division A that contain portions of a floor area or mezzanines that do not terminate at an exterior wall, a firewall or a vertical shaft, and are required by Clause 3.2.8.1.(1)(b) to be protected in conformance with Articles 3.2.8.3. to 3.2.8.9. Application 2: This also applies to: elevator hoistways that open into an interconnected floor space and into storeys above the interconnected floor space, as stated in Sentence 3.2.8.5.(3), and buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], where there are: openings through floors that are not protected by shafts or closures, as stated in Sentence 9.10.1.2.(6), or interconnected floor spaces, as stated in Sentence 9.10.9.5.(1). Exceptions: except: as exempted in Article 3.2.8.2., which applies to certain occupancies and situations, as exempted in Sentence 3.3.4.2.(3), which applies to dwelling units, as stated in Sentence 3.8.3.3.(11), which applies to barrier-free design in buildings described in Sentence 3.8.1.1.(1), and as exempted in Sentence 9.9.4.7.(1), which applies to buildings: that are not more than 2 storeys in building height, that are not more than 600 m² in building area, and in which a stairway connects the first storey to the second storey of a suite of Group D or Group E occupancy.
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Intent	Intent 1: To limit the probability that smoke will migrate from a floor area into exit stairs in a fire situation, which could lead to the buildup of smoke in the exit stairs, 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 the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders.
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