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9.10.9.11.(3)
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Minimum fire-resistance rating of fire separations that separate mercantile occupancies from dwelling units, where not more than 2 dwelling units are located in a building containing a mercantile occupancy.
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 supersede the requirements of Sentence 9.10.9.11.(2) for a residential occupancy with not more than 2 dwelling units that is adjacent to a mercantile occupancy and permit a reduction in the minimum required fire-resistance rating of the fire separation, on the basis that the number of dwelling units is limited and thus the mercantile occupancy does not pose a risk to a large number of persons.
This is to limit the probability that fire will spread from one mercantile occupancy to an adjacent residential occupancy having a different degree of fire risk, which could lead to harm to persons.
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