Notice: This site currently shows the 2012/2017 edition of the Ontario Building Code. The current legally effective code is the 2024 edition (O.Reg. 163/24), in effect since January 1, 2025. Confirm current requirements at ontario.ca.
Navigate

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.