Section 27-981.2. Carbon monoxide detecting devices; where required

a. Every
  dwelling  unit  in  a  building  within occupancy groups J-1, J-2 or J-3
  where a fossil fuel-burning furnace or  boiler  is  located,  and  every
  dwelling  unit  in  a building that is in close proximity to a source of
  carbon  monoxide,  as  such  proximity  is  established  by  the   rules
  promulgated by the commissioner in consultation with the fire department
  and  the department of health and mental hygiene, shall be equipped with
  an operational carbon monoxide detecting device approved  in  accordance
  with  the rules promulgated by the commissioner in consultation with the
  fire department  and  the  department  of  health  and  mental  hygiene,
  provided  that  there  shall  be  installed  at  least  one approved and
  operational carbon monoxide detecting device within fifteen feet of each
  room lawfully used for sleeping purposes. Such carbon monoxide detecting
  device may be combined with a smoke detecting device that complies  with
  the  provisions  of  this  title  and  any  applicable rules promulgated
  thereunder.
    b. In every building classified in  occupancy  group  G  or  occupancy
  group  H-2,  at  least  one  approved  and  operational  carbon monoxide
  detecting device shall be installed in accordance with rules promulgated
  by the commissioner in consultation with the  fire  department  and  the
  department of health and mental hygiene.
    c.  The  provisions of this article shall apply retroactively to every
  building,  in  accordance  with  the  provisions  of  subdivision  a  or
  subdivision  b  of  this section, irrespective of when such building was
  constructed or a certificate of occupancy for such building was issued.
    d. The provisions of this article may be enforced by  the  department,
  the fire department, the department of health and mental hygiene and the
  department of housing preservation and development.