3.1.9.4.

(1) Combustible sprinkler piping is permitted to penetrate a fire separation provided the fire compartments on each side of the fire separation are sprinklered.

(2) Reserved.

(3) Except as permitted by Sentences (4) to (8), combustible piping shall not be used if any part of that system penetrates,

(a) a fire separation required to have a fire-resistance rating, or

(b) a membrane that forms part of an assembly required to have a fire-resistance rating.

(4) Combustible piping is permitted to penetrate a fire separation required to have a fire-resistance rating or a membrane that forms part of an assembly required to have a fire-resistance rating, provided,

(a) the piping is sealed at the penetration by a fire stop system that has an F rating not less than the fire-resistance rating required for the fire separation when subjected to the fire test method in CAN4-S115-M, “Fire Tests of Firestop Systems”, with a pressure differential of 50 Pa between the exposed and unexposed sides, with the higher pressure on the exposed side, and

(b) the piping is not located in a vertical shaft.

(5) Combustible drain piping is permitted to penetrate a horizontal fire separation provided it leads directly from a noncombustible water closet through a concrete floor slab.

(6) Combustible piping is permitted on one side of a vertical fire separation provided it is not located in a vertical shaft.

(7) Combustible piping is permitted to penetrate a vertical or horizontal fire separation provided the fire compartments on each side of the fire separation are sprinklered.

(8) Combustible piping not more 25 mm in diameter containing chlorine gas is permitted to penetrate a fire separation between a chlorine gas service room built in conjunction with a public pool or public spa, and the remainder of the building.