2006 New York Code - Supplemental Vertical Exits.

 
    § 27-374 Supplemental vertical exits. Enclosed interior stairs, ramps,
  or escalators may provide access to an area of refuge located on a floor
  nearer to the street floor, when complying with the following:
    (a)  Limitation.  They shall be supplemental vertical exits serving no
  other purpose than to connect a floor area with an area of refuge.
    (b) Capacity. The capacity of supplemental vertical exits shall be  as
  listed for stairs in table 6-1.
    (c) Construction. Supplemental vertical exits shall comply with all of
  the construction requirements for interior stairs as provided in section
  27-375 of this article.
    (d) Openings. There shall be no openings in supplemental vertical exit
  enclosures  other than the exit doors and doors leading into the area of
  refuge.
    (e) Identification. Every supplemental vertical exit shall have a sign
  at the entrance designating its destination reading, "EXIT  TO  AREA  OF
  REFUGE ON......FLOOR."