Section 27-756. Installation and operation of ventilating and air conditioning systems

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Where mechanical ventilation  is  accepted  as  an  alternate  for,  or a supplement to, natural means of ventilation, or is
  required under the conditions herein prescribed, or where ventilation is
  provided by means of air conditioning system, the system, equipment, and
  distributing ducts shall be installed in accordance with the  applicable
  provisions of subchapters thirteen through fifteen of this chapter. Such
  required  ventilating  and/or  air conditioning systems shall be kept in
  operation at all times when the building or space is  being  used  in  a
  normal manner in accordance with the purpose for which it was intended.

                    
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