18-28-607.1 General.
   Ducts and air transfer openings in assemblies required to be protected shall be protected as provided in Chapter 7 of the Chicago Building Code.
(Amend Coun. J. 11-9-16, p. 36266, § 36; Amend Coun. J. 4-10-19, p. 100029, Art. XII, § 12; Amend Coun. J. 9-14-21, p. 35949, Art. VI, § 9)