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3.1.5.16.(3)
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Application
Application 1: 
Polypropylene pipes and fittings used for drain, waste and vent piping for the conveyance of highly corrosive materials and for piping used to distribute distilled or dialyzed water in laboratory and hospital facilities, in buildings described in Sentence 1.3.3.2.(1) of Division A that are required to be of noncombustible construction, where:
  • the building is sprinklered throughout,
  • the piping is not located in a vertical shaft, and
  • piping that penetrates a fire separation is sealed at the penetration by a fire stop system that, when subjected to the fire test method in ULC-S115, “Fire Tests of Firestop Systems,” has an FT rating not less than the fire-resistance rating of the fire separation.
Application 2: 
This also applies 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 of noncombustible construction, as stated in Sentence 9.10.6.1.(1).
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Intent
Intent 1: 
To exempt certain combustible materials from the application of Sentence 3.1.5.1.(1) if certain conditions are met, on the basis that the materials are deemed to insignificantly contribute to fire growth and spread.
Intent 2: 
To exempt polypropylene pipes and fittings from the application of Sentence 3.1.5.16.(1) if certain conditions are met, on the basis that these materials are deemed to insignificantly contribute to fire growth and spread.
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