The Ontario Building Code | Oval Chimney Flues
9.21.2.6. Oval Chimney Flues
(1) The width of an oval chimney flueshall be not less than two-thirds its breadth.
9.21.3. Chimney Lining
In Plain Language
Oval chimney flues, an alternative shape to round or rectangular, must meet the requirements set out in this article.
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.