The Ontario Building Code | Yoke Vents
220.127.116.11. Yoke vents
(a) installed for each section of 5 storeys or part of them counted from the top down,
(b) installed at or immediately above each offset or double offset, and
(c) sized in accordance with Sentence 18.104.22.168.(1).
(2) The yoke vent shall be connected to the soil or waste stack by means of a drainage fitting at or immediately below the lowest soilor waste pipe from the lowest storeyof the sections described in Sentence (1).
(4) A yoke vent need not be installed provided the soil or waste stack is interconnected with the vent stackin each storey of the section in which fixtures are located by means of a vent pipe equal in size to the branch or fixture drain or 2 in. in size, whichever is smaller.