Domestic cooking exhaust equipment shall discharge to the outdoors through sheet metal ducts constructed of galvanized steel, stainless steel, aluminum or copper. Such ducts shall have smooth inner walls, shall be airtight and shall be equipped with a backdraft damper. Installation in Group I-1 and I-2 occupancies shall be in accordance with the Chicago Building Code.
Exception: Within Group R dwelling units or sleeping units, where installed in accordance with the manufacturer's instructions and where mechanical or natural ventilation is otherwise provided in accordance with Article 4, listed and labeled ductless (recirculating) range hoods shall not be required to discharge to the outdoors.
(Amend Coun. J. 9-14-21, p. 35949, Art. V, § 12)