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Openings in all required stairway and shaft enclosures shall be limited to those essential to the purpose of the shaft and shall be protected with self-closing one-and-one-half-hour Class B fire doors or other approved protective assemblies complying with the requirements of Section 15-12-070 with the following exceptions:
(a) In residential units not exceeding three stories in height, openings in the enclosures of stairways serving not more than four dwelling units in any floor may be protected with doors not less fire-resistant than solid wood doors one-and-three-fourths-inches thick, and shall be equipped with approved self-closing devices.
(b) Door openings in elevator and dumbwaiter shafts shall be protected by opening protective assemblies having a fire-resistive rating of one-and-one-half-hour conforming to the test requirements of Sections 15-12-080 to 15-12-100 inclusive, and Sections 15-12-120 to 15-12-150 inclusive. Such doors shall not be required to be self-closing and no heat-actuated closing device shall be installed on any landing opening in an elevator or dumbwaiter hatchway.
(c) In all occupancies except Class B, institutional, stairwell doors in buildings of Type I construction serving not more than three floors may be equipped with automatic closers activated by products of combustion (other than heat) fire detectors. Such closers shall comply with all of the following:
(1) Upon release of the hold-open mechanism, the door shall be self-closing.
(2) The hold-open mechanism shall be so designed that the door may be instantly released manually and upon release become self-closing.
(3) Upon loss of power to the hold-open device, the hold-open mechanism shall release.
(4) Each door shall be equipped with a fire detector on either side of the door opening arranged so that operation of either detector will release the hold- open mechanism.
(5) Each fire detector shall be located on the ceiling along the centerline of the door opening not more than five feet or less than one foot from the opening. Where a door opening into a stairwell has more than one double door, each pair of doors shall be equipped with detectors arranged to release all doors at that floor level.
(6) The fire detectors, hold-open mechanisms, and closers, shall be listed by a national products testing laboratory whose main purpose is the testing of products for fire protection and safety.
(Prior code § 62-3.6; Amend Coun. J. 6-27-90, p. 17607)