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9.24.2.4.(4)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Intermediate support for framing above door openings in non-loadbearing, steel stud fire separations required to have a fire-resistance rating, in 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 of inadequate top support for the frames of rated doors, which could lead to an inadequate resistance to forces exerted by the warping of rated doors under fire loads, which could lead to the opening of gaps between such doors and their frames.
This is to limit the probability of compromised fire resistance of the assembly, which could lead to harm to persons.
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