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4.1.5.18.(1)
ApplicationIntent
OS1OP1OP3
ObjectiveOS1 Fire Safety
Attribution
[F20-OS1.2]
Application
Application 1: 
Specified horizontal load for the design of firewalls.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.
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Intent
Intent 1: 
To limit the probability that the horizontal load for the design of firewalls will not take into account the maximum expected forces that occur during a fire, which could lead to the structural failure of or damage to the firewalls, which could lead to the spread of the fire, which could lead to harm to persons on the other side of the firewalls.
Intent 2: 
To direct Code users to other requirements in Section 4.1. specifying lateral loads on walls [e.g. wind pressure].
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