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3.1.10.2.(1)
OS1OP1+OP3
ObjectiveOS1 Fire Safety
Attribution
[F03-OS1.2] Applies to portion of Code text: “A firewall that separates a building or buildings with floor areas containing a Group E or a Group F, Division 1 or 2 major occupancy shall be constructed as a fire separation of noncombustible construction having a fire-resistance rating not less than 4 h …”
Application
Application 1: 
Minimum fire-resistance rating of a firewall that separates a building or buildings with floor areas containing Group E or Group F, Division 1 or 2 major occupancies.
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] as stated in Sentence 9.10.11.3.(1).
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Intent
Intent 1: 
To limit the probability that a firewall will have insufficient fire-resistance, which could lead to the spread of fire from one building to another, which could lead to harm to persons in the building not originally involved in the fire.
Intent 2: 
To limit the probability that fire will spread from one building to another during the time needed for emergency responders to carry out their duties, which could lead to harm to persons in the building not originally involved in the fire.
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