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9.9.4.7.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Stairways that serve the second storey of suites of Group D or E occupancy that are located partly on the first storey and partly on the second storey, where:
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except for exits that serve not more than one dwelling unit, as stated in Sentence 9.9.4.1.(1).
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Intent
Intent 1: 
To supersede the requirements stated in Sentence 9.9.4.2.(1), which would otherwise require the stairway to be separated from floor areas, and in Sentence 9.10.1.2.(6), which would otherwise require an unenclosed stairway to conform to Subsection 3.2.8. for the protection of openings through floor assemblies, if certain conditions are met.
This is to limit the probability of delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
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