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.