N.Y. Multiple Residence Law § 205: Separation and ventilation of stairs

§ 205. Separation and ventilation of stairs. 1. All stairs and

fire-stairs shall be completely separated from one another and from

every elevator or other shaft by fireproof walls. They shall be

constructed of fireproof material throughout and shall contain no wood

or other inflammable material of any kind, except that handrails of

hardwood may be provided.

2. Access to stairs and fire-stairs from any public vestibule or other

public hall shall be through fireproof doors and assemblies, with the

doors self-closing and at least three feet wide, or through pairs of

such doors at least four feet wide, containing in either case a fixed

sash glazed with wire glass at least one-quarter inch thick and at least

three hundred sixty square inches in area.

3. At the highest level of every stair and fire-stair there shall be

provided a window or a skylight. At such termination, there shall also

be an opening of at least one hundred forty-four square inches which

shall communicate directly to the outer air, which opening may be a part

of such window or skylight. Except as herein provided, such skylight

shall ccomply with the provisions of subdivision two of section one

hundred eight.