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9.10.9.10.(2)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Division by fire separations of horizontal service spaces or other concealed spaces located above required vertical fire separations, where the construction between such spaces and the spaces below is constructed as a fire separation having a fire-resistance rating not less than that required for the vertical fire separation.
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:
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Intent
Intent 1: 
To supersede the requirements of Sentence 9.10.9.10.(1), which would otherwise require the space between a horizontal service space or other concealed space and a required vertical fire separation to be divided at the fire separation, if certain conditions are met.
This is to limit the probability that fire will spread from one fire compartment to another by means of the horizontal service space or concealed space, which could lead to harm to persons in the other compartment.
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