2006 New York Code - Ventilation.

 
    §  27-838  Ventilation.  Fixed  ventilation  for combustion air to the
  incinerator room shall be provided by a louvered opening in  a  wall  to
  outdoor  air.  When ducts are used, they shall be sized and installed so
  as to provide the amount of air required  for  combustion,  taking  into
  consideration  head  loss.  Fans  may be installed to deliver air to the
  incinerator  room,  provided  they  are  in   operation   whenever   the
  incinerator  is  in  use.  Louvers,  ducts,  and  fans shall be sized to
  deliver at least two and one-half cfm of air for each pound per hour  of
  refuse  while  burning is taking place. All duct work shall be installed
  in accordance with the  requirements  of  subchapter  thirteen  of  this
  chapter.