2006 New York Code - Boiler Rooms

 
    §  139.  Boiler  rooms.   In every dwelling the boiler or furnace of a
  central heating plant shall be enclosed in a fireproof room or space and
  all openings therefrom to  other  portions  of  the  dwelling  shall  be
  equipped   with   fireproof   doors   and   assemblies  with  the  doors
  self-closing, except that in any  dwelling  three  stories  or  less  in
  height, such room or space may in the alternative be enclosed with walls
  or  partitions  constructed  of fire-resistive materials and the ceiling
  fire retarded.