7.5.2.1.Wet Venting

(1) A sanitary drainage pipe is permitted to serve as a wet vent, provided (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) where 2 water closets are installed, they are connected at the same level by means of a double sanitary T fitting if the vent pipe is vertical and by means of a double Y fitting if the vent pipe is horizontal, (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 NPS 2, except for connections from emergency 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 the wet vent or a wet-vented water-closet trap arm, (g) the hydraulic load of separately vented fixtures that drain into the wet vent are not included when sizing the continuous vent that serves the wet vent, (h) where 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 1.2 m for pipes of NPS 2 or less, or (ii) the offset does not exceed 2.5 m for pipes larger than NPS 2, (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), (k) the length of the wet vent is not limited.