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3.1.8.3.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Division by fire separations of a horizontal service space or other concealed space located above a required vertical fire separation, including the walls of a vertical shaft, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Exceptions: 
except as stated in Sentence 3.6.4.2.(2), which applies to the fire separation of horizontal service spaces.
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Intent
Intent 1: 
To limit the probability that fire will spread from one fire compartment to another fire compartment through concealed spaces located above a vertical fire separation, which could lead to harm to persons.
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