7.5.2.

(1) A soil or waste pipe may serve as a wet vent provided that,

(a) the hydraulic load is in accordance with Table 7.5.8.1.,

(b) the number of wet vented water closets does not exceed 2,

(c) when 2 water closets are installed, they are connected at the same level to a vertical part of the stack by means of a double fitting in accordance with Table 7.2.4.5.,

(d) the water closets are installed downstream of all other fixtures,

(e) trap arms and fixture drains connected to the wet vent do not exceed 2 in. in size, except for connections from floor drains in accordance with Sentence 7.5.1.1.(3),

(f) the total hydraulic load on the wet vent does not exceed the limits stated in Table 7.5.8.1. when separately vented branches or fixture drains in the same storey, having a total hydraulic load not greater than 2 fixture units, are connected to a wet vent or a wet vented water closet trap arm,

(g) the hydraulic load to be considered when sizing a continuous vent, that serves a wet vent only includes the hydraulic load that is wet vented,

(h) when a wet vent extends through more than one storey, the total discharge from any one storey above the first storey does not exceed 4 fixture units,

(i) there is not more than one nominally horizontal offset in the wet vent, and,

(i) the offset does not exceed 1 200 mm for pipes 2 in. or less in size, or

(ii) the offset does not exceed 2 500 mm for pipes larger than 2 in. in size,

(j) the wet vented portion is not reduced in size except for the portion that is upstream of floor drains in accordance with Sentence 7.5.1.1.(3), and

(k) the length of the wet vent is not limited.