DOB Findings and Recommendations for WTC, Feb 2003

NYC 9/11 Public Portal Document

Section 27-383 of article 7 of subchapter 6 means of egress of chapter one of title twenty-seyen of the administratiye code is amended to read as follows: §27-383 Egress Requirements Ja) Except in occupancy groups J-2 and J-3, the location of eyery exit on eyery floor and every opening from a room classified in occupancy group J-1 and containing cubicles shall be clearly indicated by exit signs. Such signs shall be placed at an angle with the exit opening if such placement is required for the signs to serve their purpose. In long corridors, in open floor areas, and in all other situations where the location of the exit may not be readily visible or understood, directional signs shall be provided to serve as guides from all portions of the corridor or floor. r (bl In addition to the above requirements and the applicable requirements set forth in article 9 of this subchapter, exit signs in high rise buildings classified in Occupancy Group E shall comply with the following: (11 Illuminated exit signs complying with section 27-386 shall be placed in stairwells with horizontal extensions to indicate the transition from yertical to horizontal direction and at turns along the horizontal path. (21 A supplementary sign complying with sections 27-394 and 27-395, except that the lettering and numerals shall be at least one inch (25.4 mml high, indicating the location of a recessed re-entry door shall be securely attached on the wall of the landing that faces the eyacuee on the stairs. (3) In stairs where there is no entry or exiting from such stair for more than four (41 floors, a sign complying with sections 27-394 and 27-395, except that the lettering and numerals shall be at least one inch (25.4 mml high, shall be securely attached at the beginning of the descent into such portion of the stair on the wall of the landing that faces the eyacuee on the stairs stating the location of the next re-entry or exiting floor. On each floor within such portion of the stair a sign complying with sections 27-392 and 27-395 shall be securely attached to the wall of the landing that faces the eyacuee on the stairs approximately fiye feet (1.525 ml aboye the floor indicating the floor number. (4) Signs shall be readily yisible from the egress direction.

5.7.2 Elevator Vestibules Section 27-232 of article 2 of subchapter 2 definitions of title twenty-seven of the administrative code is amended to read as follows: ELEVATOR VESTIBULE - A room or space enclosed with noncombustible smoke barrier partitions with smoke stop doors conforming to subdivision (c1 of section 27-371. Except for such smoke stop doors, openings to elevators and to exits shall be the only other door openings permitted in the enclosing partitions. However, such vestibules, when located in buildings classified in Occupancy Group E. may have other penetrations provided smoke dampers as defined in Reference Standard RS 13-1 protect such penetrations. The requirement for smoke dampers shall not apply to package pass through and communication openings not to exceed one (11 square foot (0.0929 m^1 in area. SMOKE BARRIER - Any continuous noncombustible construction, vertical, horizontal or otherwise, such as a wall, floor, or ceiling assembly, that is designed and constructed to restrict the spread of smoke. A smoke barrier may or may not have a fire resistance rating. Smoke barriers may have openings that are protected by automatic closing devices, adequate to inhibit movement of smoke through the opening. The smoke barrier may be constructed of heat-strengthened or tempered glazing or the equivalent and protected by sprinkler heads constructed in accordance with subchapter 17 of this chapter and installed a maximum of 6'-0" (1.830 ml on center on each side of the barrier. If the smoke barrier is constructed of glass, the portions of the smoke barrier located within two feet (610 mml of the door opening and within five feet (1.525 ml of the floor shall be constructed of tempered glass. Glass panels having an area in excess of nine square feet (0.8361 m^1 with the bottom edge less than 18 inches (457 mml above the floor shall likewise be constructed of tempered glass. Portions of glass smoke barriers within six feet (1.830 ml horizontally of the vertical edge of an opening shall be marked in accordance with the Rules of the Board of Standards and Appeals. Article 5 of subchapter 5 fire protection construction requirements of chapter one of title twenty­ seven of the administrative code is amended by adding a new section §27-353.02 Smoke Protection for Elevators to follow §27-353.01 Smoke Protection for Elevators and Escalators as follows: §27-353.02 - Smoke Protection, Elevators

February 2003 WTC Building Code Task Force Page 45 Findings and Recommendations

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