Section 31(iv) in Punjab Cinemas (Regulation) Rules, 1952
(iv)[ There shall be a time gap of not less than twenty minutes between two cinematograph shows. The duration of an interval in a cinematograph show shall be not less than ten minutes. During the gap between two shows and the interval in a show all doors and ventilators shall be kept wide open and all exhaust and other fans will be worked at top speed so that the whole of the auditorium shall be flushed with air completely] [Punjab Government Notification published in Punjab Government Gazetted, Legislative Supplement Part III, dated 24.7.1956.].
