909.5.3 Opening protection.
BC § 909.5.3
Openings in smoke barriers shall be protected by automatic-closing devices actuated by the required controls for the mechanical smoke control system. Door openings shall be protected by fire door assemblies complying with Section 716.5.3. Exceptions: 1. Passive smoke control systems with automatic-closing devices actuated by spot-type smoke detectors listed for releasing service installed in accordance with Section 907.3.
2.Fixed openings between smoke zones that are protected utilizing the airflow method.
3.In Group I-1, Group I-2, and Group B ambulatory care facilities, where a pair of opposite-swinging doors are installed across a corridor in accordance with Section 909.5.3.1, the doors shall not be required to be protected in accordance with Section 716. The doors shall be close-fitting within operational tolerances and shall not have a center mullion, louvers, grilles, or door undercuts in excess of 3/4 inch (19.1 mm). The doors shall have head and jamb stops and astragals or rabbets at meeting edges. If allowed by the door manufacturer's listing, positive-latching devices are not required.
4.In Group I-1, Group I-2 and Group B ambulatory care facilities, where such doors are special-purpose horizontal sliding, accordion or folding door assemblies installed in accordance with Section 1010.1.4.3 and are automatic closing by smoke detection in accordance with Section 716.5.9.3.
5.Group I-3.
6.Openings between smoke zones with clear ceiling heights of 14 feet (4267 mm) or greater and bank-down capacity of greater than 20 minutes as determined by the design fire size.
