The Ontario Building Code | Indirect Connections
7.3.3.11. Indirect Connections
(1) Where a fixture or device is indirectly connected, the connections shall be made by terminating the fixture drain above the flood level rim of a directly connected fixture to form an air break.
(2) The size of the air break shall be at least 25 mm.
In Plain Language
Where a fixture or device connects indirectly (rather than tying straight into the drainage system), the connection must terminate above the flood level rim of a receptor, preventing sewage from backing up into the fixture.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.