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9.24.3.2.(4)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum upward extension and fastening of framing above doors installed in steel door frames in non-loadbearing exterior and interior 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 the inadequate attachment of upper runners to studs, which could lead to framing of inadequate stiffness to resist forces exerted by the twisting of door frames on exposure to heat from a fire, which could lead to the premature failure of fire-rated assemblies, which could lead to harm to persons.
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