The Ontario Building Code | Connections and Openings in Air Duct Systems
6.2.3.3. Connections and openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings in Air Duct Systems
(1) Air duct systems shall have,
(a) tight-fitting connections throughout, and
(b) no openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings other than those required for proper operation, inspection and maintenance of the system.
(2) Access openings="http://thehandyforce.com/windows/" title ="Window installer in Toronto">openings shall be provided in duct systems to allow the removal of material that may accumulate in plenums and ducts.
In Plain Language
Connections and openings in air duct systems must meet specific requirements addressing how ducts interface with equipment, other ducts, and the building structure without compromising fire separations or performance.
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.