The Ontario Building Code | Connections and Openings in Air Duct Systems
184.108.40.206. Connections and openings in Air Duct Systems
(1) Air duct systems shall have,
(a) tight-fitting connections throughout, and
(b) no openingss other than those required for proper operation, inspection and maintenance of the system.
(2) Access openings shall be provided in duct systems to allow the removal of material that may accumulate in plenums and ducts.