N.Y. Labor Law § 266: Exterior enclosed fireproof stairway

§ 266. Exterior enclosed fireproof stairway. "Exterior enclosed

fireproof stairway" means a stairway conforming to the following

requirements:

1. It shall be completely enclosed from top to bottom by walls of

fireproof material not less than eight inches thick extending from the

sidewalk, court or yard level to the roof, and above the roof so as to

form a bulkhead.

2. It shall in all other respects except as herein provided conform to

the requirements of section two hundred and seventy in regard to the

construction of stairways and their enclosures, except that stairways

and landings in an exterior fireproof enclosed stairway not exceeding

one hundred feet in height may be constructed of other than

incombustible material to be approved by the board.

3. There shall be no opening in any wall separating it from the

building.

4. Access shall be provided to the stairway from every floor of the

building by means of an outside balcony or vestibule of steel, iron or

masonry. Every such balcony or vestibule shall have an unobstructed

width of at least forty-four inches and shall be provided with a

fireproof floor and a railing of incombustible material not less than

three feet high. Access to such balconies from the building and to the

stairway from the balconies shall be by means of firedoors. The level of

the balcony floor shall be not more than seven inches below the level of

the door sill of the building. The doors shall swing outward onto the

balcony and inward from the balcony to the stairway, and shall be

provided with locks or latches with visible fastenings requiring no key

to open them in leaving the building. The balconies shall be open on at

least one side, upon an open space not less than one hundred square feet

in area.

5. The landings shall be of such width that the doors in opening into

the stairway shall not reduce the free passageway of the landings to a

width less than the width of the stairs.

6. Such stairway shall be provided with a proper lighting system

furnishing adequate light and shall be so arranged as to ensure its

reliable operation, when through accident or other cause the regular

factory lighting is extinguished.