Section 27-876. Chimneys for building service incinerators

Chimneys for
  building service incinerators shall be constructed  in  accordance  with
  the  requirements  of  this  subchapter  for  high or medium temperature
  chimneys, based upon the temperature  of  the  flue  gases  leaving  the
  equipment,  except  that  no  reduction of flue gas temperature shall be
  recognized if such reduction is the result of using water  scrubbers  or
  barometric  dampers.  In  addition,  such chimneys shall comply with the
  following:
    (a) Chimneys shall extend through the roof and be open to the air.
    (b) Chimneys shall be provided with a spark arrester  as  required  in
  paragraph four of subdivision (a) of section 27-875 of this article.
    (c)  Incinerators  may discharge into chimneys serving other equipment
  provided such combined chimney  is  of  adequate  size  for  both  uses,
  conforms  to  construction  required  for  the  highest temperature, and
  adequate draft control equipment is provided for each  device  connected
  to the combined chimney.