N.Y. Labor Law § 267: Horizontal exit

§ 267. Horizontal exit. 1. "Horizontal exit" means the connection by

one or more openings, protected by firedoors, through a fire wall in any

building, or through a wall or walls between two buildings, which doors

shall continuously be unlocked and the opening unobstructed whenever any

person is employed on either side of the opening.

2. Exterior balconies and bridges not less than forty-four inches in

width connecting two buildings and not having a gradient of more than

one foot fall in six, may also be counted as horizontal exits when the

doors opening out upon said balconies or bridges are fireproof doors and

are level with the floors of the building, and when all doors of both

buildings opening on such balconies or bridges are continuously kept

unlocked and unobstructed whenever any person is employed on either side

of the exit, and when such balconies or bridges are built of

incombustible material and are capable of sustaining a live load of not

less than ninety pounds per square foot with a factor of safety of four;

and when such balconies or bridges are enclosed on all sides to a height

of not less than six feet and on top and bottom by fireproof material,

unless all windows or openings within thirty feet of such balconies in

the connected buildings shall be encased in metal frames and sash and

shall have wired glass where glass is used.

3. In any case there shall be on each side of the wall or partition

containing the horizontal exit and independent of said horizontal exit,

at least one stairway conforming to the requirements for a required

exit.