2006 New York Code - Vertical And Horizontal Openings.

 
    §  57.  Vertical  and  horizontal  openings.  In  order to prevent the
  vertical and horizontal spread of fire, smoke and gases,  it  shall,  in
  addition to other applicable provisions of this article, be necessary to
  comply with the requirements of this section.
    1.  All  doors opening from shafts, stair halls or stairs and the door
  assemblies shall  be  fire-retarded  with  the  doors  self-closing  and
  without  transoms  or  any other opening. Except in the case of elevator
  shafts, such shafts, stair halls  or  stairs  may  be  protected  by  an
  automatic sprinkler system in lieu of fire retarding.
    2.  All  other doors opening upon entrance halls or other public halls
  or corridors in every part of the dwelling shall be self-closing, except
  where such  dwelling  is  equipped  throughout  with  an  approved  type
  automatic  sprinkler  or  fire-detecting system. It shall be unlawful to
  attach to or maintain on or about any door required to  be  self-closing
  any device which prevents the self-closing of such door.
    3.  Every existing interior glazed sash, window or opening, other than
  a door, or a fireproof sash, window or opening glazed with  wire  glass,
  in  any  partition  forming  required enclosures around stairs or shafts
  shall be removed and the openings closed up and fire-retarded.