The Ontario Building Code | Cleanout
9.21.4.7. Cleanout
(1) Except for a chimney flue constructed to serve a masonry fireplace, a cleanout opening with a metal frame and tight-fitting metal door shall be installed near the base of the chimney flue.
In Plain Language
A cleanout, an accessible opening at the chimney's base, is required as set out in this article, letting soot and debris be removed periodically.
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.