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Pipe shafts and ducts passing from one floor to another shall be enclosed with construction providing fire resistance of not less than one hour except that pipes and ducts requiring openings through floors not exceeding nine square feet in area shall not require enclosure; provided, that openings between such pipes or ducts and the floor construction shall be filled with noncombustible materials securely held in place to prevent the passage of fire.
(Prior code § 62-3.4)