The Ontario Building Code | Chimney Flue Limitations
9.21.2.1. Chimney Flue Limitations
(1) Achimney flue that serves a fireplace or incinerator shall not serve any other appliance.
(2) Achimney flue that serves a solid fuel-burning appliance shall not be connected to a natural gas- or propane-fired appliance.
(3) Achimney flue that serves a solid fuel-burning appliance shall not be connected to an oil-burning appliance unless the solid fuel-burning appliance is listed for such installation and the installation of both appliances meets their respective installation requirements.
In Plain Language
A chimney flue has limitations on what it can serve, as set out in this article, addressing safe venting capacity and appliance compatibility.
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.