18-28-512.2 Materials.
   Subslab soil exhaust system duct material shall be air duct material listed and labeled to the requirements of UL 181 for Class 0 air ducts, or any of the following piping materials that comply with the Chicago Plumbing Code as building sanitary drainage and vent pipe: cast iron; galvanized steel; copper or copper-alloy pipe or tube; and plastic piping.
(Amend Coun. J. 9-14-21, p. 35949, Art. V, § 25)