Section 65. Boiler rooms

1. Except as hereafter provided, in every multiple
  dwelling  erected  after April eighteenth, nineteen hundred twenty-nine,
  which is four stories or more in height the boiler shall be enclosed  in
  a  room  or  space  constructed  with fireproof walls extending from the
  floor  construction  to  the  ceiling  construction,  and  all  openings
  therefrom  to  other  portions  of  the  dwelling shall be equipped with
  fireproof doors and assemblies with the doors self-closing. However,  in
  all  multiple  dwellings,  on  and after January first, nineteen hundred
  sixty-six, a room or space provided with a central heating  plant  shall
  be  completely  enclosed  with incombustible materials having a standard
  fire-resistive rating of at least one hour.
    2. In such a dwelling access to a cellar or lowest story  in  which  a
  boiler  is  located  shall not be through any boiler room, nor shall any
  cellar or basement stair or any shaft be installed within a boiler room.
    3.  The  department  shall  have  the  power  to  make   supplementary
  regulations relating to boiler or furnace rooms.