18-28-510.7 Suppression required.
   Ducts shall be protected with an approved automatic fire suppression system installed in accordance with the Chicago Building Code.
   Exception: An approved automatic fire suppression system shall not be required in ducts conveying materials, fumes, mists and vapors that are nonflammable and noncombustible.
(Amend Coun. J. 9-14-21, p. 35949, Art. V, § 23)