Section 12(2) in The U.P. Cinematograph Rules, 1951
(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.
