1022.9 Smokeproof Enclosures and Pressurized Stairways

discharge serving such stories shall be a smokeproof enclosure or pressurized stairway in accordance with Section 909.20 ...

A smokeproof enclosure or pressurized stairway shall exit into a public way or into an exit passageway, yard or open space having direct access ...

be by smoke detectors installed at each floor level at an approved location at the entrance to the smokeproof enclosure. When the closing device for the stair shaft and vestibule doors is activated by smoke detection or power failure, the mechanical equipment shall activate and operate at the required performance levels. Smoke detectors shall be installed in accordance with Section 907.3. Where required by Section 1022.9, a smoke proof enclosure shall be constructed in accordance with this section. Where access to the roof is required by the New York City Fire Code , such access shall be from the smoke proof enclosure where a smoke proof enclosure is required. Smokeproof enclosures shall consist of one of the following systems: 1. An enclosed interior exit stairway constructed in accordance with Section 1022.1 and accessed through an open exterior balcony. 2. An enclosed interior exit stairway constructed in accordance with Section 1022.1 and accessed through a naturally ventilated vestibule. 3. An enclosed interior exit stairway constructed in accordance with Section 1022.1 and accessed through a mechanically ventilated vestibule. 4. A pressurized interior ...

at an approved location at the entrance to the smokeproof enclosure. When the closing device for the stair shaft and vestibule doors is activated by smoke detection or power failure, the mechanical equipment shall activate and operate at the required performance levels. Smoke detectors shall be installed in accordance with Section 907.10. Smokeproof enclosure ventilation systems shall be independent of other building ventilation systems. The equipment and ductwork shall comply with one of the following:   1. Equipment and ductwork shall be located exterior to the building and directly connected to the smokeproof enclosure or connected to the smokeproof enclosure by ductwork enclosed by 2-hour fire-resistance-rated fire barriers.   2. Equipment and ductwork shall be located within the smokeproof enclosure with intake or exhaust directly from and to the outside or through ductwork enclosed by 2-hour fire-resistance-rated fire barriers.   3. Equipment and ductwork shall be located within the building if separated from the remainder of the building, including other mechanical equipment, by 2-hour fire-resistance-rated fire barriers. Before the mechanical equipment is approved, the system shall be tested in the presence of the department or approved agency to confirm that the system is operating in compliance with these requirements. Door opening force shall not exceed limits in Section 1008.1.2. Each vestibule shall have a minimum net area of 16 square feet (1.5 m 2 ) of opening in a wall facing an outer court, yard or public way that is at least 20 feet (6096 mm) in width. The provisions of Sections 909.20.4.1 through 909.20.4.4 shall apply to ventilation of smoke proof enclosures by mechanical means. Mechanical vestibule and stair shaft ventilation systems and automatic fire detection systems shall be powered by a standby power system conforming to Section 403.10 and Chapter 27. *Section BC 909.20.6.2 was amended by: Local Law 111 of 2013 – Update #83. This law has an effective date of Dec. 2, 2013. Where required by Section 1019.1.8, a smoke proof enclosure shall be constructed in accordance with this section. Where access to the roof is required by the New York City Fire Code, such access shall be from the smoke proof enclosure where a smoke proof enclosure is required. Smokeproof enclosures shall consist of one of the following systems:   1. An enclosed interior exit stairway constructed in accordance with Section 1019.1 and accessed through an open exterior balcony.   2. An enclosed interior exit stairway constructed in accordance with Section 1019.1 and accessed through a naturally ventilated vestibule.   3. An enclosed interior exit stairway constructed in accordance with Section 1019.1 and accessed through a mechanically ventilated vestibule.   4. A pressurized interior exit stairway constructed in accordance with Section 1019.1 ...

-resistance-rated construction, or the fire-resistance rating of the stairway enclosure, whichever is greater. Access to the enclosed usable space shall not be directly from within the stair enclosure.    Exception: Spaces under stairways serving and contained within a single residential dwelling unit in Group R-2 or R-3.   There shall be no enclosed usable space under exterior exit stairways unless the space is completely enclosed in 1-hour fire-resistance-rated construction. The open space under exterior stairways shall not be used for any purpose. A stairway in an exit enclosure shall not continue below the level of exit discharge unless an approved barrier is provided at the level of exit discharge to prevent persons from unintentionally continuing into levels below. Directional exit signs shall be provided as specified in Section 1011. An approved barrier shall consist of one-hour rated construction separating the portion of the vertical exit above grade from the portion below grade, with a three-quarter hour rated self-closing door, opening in the direction of exit travel from the floors below grade.    Exception: Such barrier separating the above grade portion of the vertical exit from the portion below grade shall not be required in Group E and R-3 occupancies. A sign shall be provided at each floor landing in interior vertical exit enclosures connecting more than three stories designating the floor level, the terminus of the top and bottom of the stair enclosure and the identification of the stair. The signage shall also state the story of, and the direction to the exit discharge and the availability of roof access from the stairway for the Fire Department. Each stair shall be identified by an alphabetic letter. Stairway identification signs shall be provided on both sides of each stair door. The signs shall be located 5 feet (1524 mm) above the floor landing in a position which is readily visible when the doors are in the open and closed positions. A smokeproof enclosure or pressurized stairway ...