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(a) Exit. An “exit” is a means of egress from a building or structure including outside exits, vertical exits, horizontal exits and exit connections as herein defined.
(b) Vertical Exit. A “vertical exit” is a means of exit used for ascension or descension between two or more levels including stairways, smokeproof towers, ramps, escalators and fire escapes.
(c) “Horizontal exit” means a protected opening through a two-hour fire partition through or over or around a fire wall or a bridge connecting two buildings.
(d) “Outside exit” means an exit from the building to a public way, to an open area leading to a public way, or to an enclosed fire-resistive passage leading to a public way.
(e) “Exit connections” means and includes doorways, aisles, corridors, foyers, lobbies and other horizontal means of exit leading to a vertical exit, a horizontal exit or an outside exit.
(f) “Flight” means a series of steps between successive landings or between a landing and a floor.
(g) “Landing” means a platform between two flights of stairs.
(h) “Newel post” means an upright post at the end of a stair railing.
(i) “Ramp” means an inclined passageway connecting two levels.
(j) “Riser” means the vertical distance of a step between two successive treads or between a tread and a landing or floor.
(k) “Stairways” means one or more flights of stairs with connecting landings.
(1) “Enclosed stairway” means a stairway separated by fire-resistive partitions from the rest of the building.
(2) “Exterior stairway” means a stairway on the outside of a building or structure.
(3) “Interior stairway” means a stairway within a building or structure.
(l) “Tread” means the horizontal distance between two successive risers in a flight.
(Prior code § 67-2)
All required means of exit shall be continuous means of egress to the outside and shall consist of vertical exits, horizontal exits and outside exits together with the exit connections leading thereto, and shall be arranged, located and constructed as required in this chapter.
(Prior code § 67-3)
Exits from a story above or below grade shall consist of interior stairways except as otherwise required in this section.
(a) Smokeproof Towers. A smokeproof tower may be used in lieu of any required interior stairway. At least one smokeproof tower shall be provided in every building, having a height exceeding 264 feet.
(b) Horizontal Exits. A horizontal exit may be used in lieu of an interior stairway when there is not less than one interior stairway or outside exit in each fire area connected by the horizontal exit, provided that no greater than 50 percent of the exits in any fire area shall be horizontal exits.
(c) Escalators. An escalator may be used in lieu of one of three required interior stairways.
(d) Exterior Stairways. Exterior stairways may be used in lieu of not more than 50 percent of the required interior stairways; provided, however, that the vertical distance from grade to the highest floor served by an exterior stairway shall not exceed 30 feet.
(e) Ramps. Ramps complying with the requirements of Section 13-160-430 may be used in lieu of any required stairway.
(f) Slide Pole. Slide poles as permitted by Section 13-160-050.
(g) Elevators shall be provided in all new public buildings with emergency hold open buttons and the emergency communications no higher than four feet from the floor, except in buildings which provide ramps for the handicapped as noted in Section 13-160-470 of this Code.
(h) Other means of exit such as collapsible escape ladders or other devices, may be permitted in unusual circumstances and shall comply with such requirements as the building commissioner shall prescribe.
(Prior code § 67-3.1; Amend Coun. J. 4-12-91, p. 32360; Amend Coun. J. 3-5-03, p. 104990, § 34; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)
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