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9.10.16.1.(1)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Separation [fire stopping] of vertical concealed spaces in interior walls and exterior walls from:
  • other vertical concealed spaces, and
  • horizontal concealed spaces.
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 wall assemblies 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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