(1)all parts of a permanent building be shall properly and sufficiently Ventilated.(2)Unless the auditorium of a permanent building is air conditioned, it shall in addition to natural ventilation be provided with sufficient number of power-driven exhaust fans suitably located and of adequate size, at least one large size exhaust fan being provided for every 150 persons.The number and size of such fans shall be approved by the licensing Authority and shall be entered in the licence. All exhaust fans shall be kept working during performances except when the air-conditioning plant, if any, is working.(3)When windows or skylights which provide internal ventilation have to be darkened or obscured, free permanent ventilation shall also be provided through ridge or ceiling ventilators. The clear opening of such ventilation shall be not less than one square foot for every ten Persons accomodated:Provided that the Licensing Authority may relax the condition in the case of buildings already constructed and having sufficient ventilation otherwise, if the extra ventilation is likely to prove very expensive.(4)Except in the case of air-conditioned buildings, ceiling and bracket fans, in such numbers and of such size as may be approved by the Licensing Authority, shall be provided in addition to exhaust fans.(5)If more than one exhibition is given on any day, the entire auditorium shall be flushed with air for at least fifteen minutes before each exhibition and shall be aired thoroughly. No Spectator shall be permitted to be present in the auditorium during this period.
