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9.10.16.1.(3)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Fire stopping at interconnections between concealed vertical and horizontal spaces in interior coved ceilings, drop ceilings and soffits where the exposed construction materials within the concealed spaces have a surface flame-spread rating greater than 25.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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Intent
Intent 1: 
To limit the probability that concealed spaces in interior coved ceilings, drop ceilings and soffits will not be separated from certain other concealed spaces, which could lead to the spread of fire within these spaces, which could lead to harm to persons.
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