The Ontario Building Code | Exhaust Ducts and Outlets
6.2.4.11. Exhaust Ducts and outlets
(1) Where an exhaust duct passes through or is adjacent to unheated space, the duct shall be insulated to prevent moisture or condensation in the duct.
(2) Exhaust outlets shall be designed to prevent back draft under wind conditions.
(3) Exhaust ducts directly connected to laundry drying equipment shall be independent of other exhaust ducts.
(4) Exhaust systems shall discharge directly to the outdoorref ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doors.
In Plain Language
Where an exhaust duct passes through or is adjacent to unheated space, the duct must be insulated to prevent moisture or condensation from forming inside it, which could otherwise lead to mould or corrosion.
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.