Walk into any mall in India and you will notice something interesting. The temperature outside the multiplex lobby feels completely different from the temperature inside the movie screen area. That smooth transition does not happen by accident. In multiplexes an air curtain plays a major role in maintaining those temperature zones efficiently. https://medium.com/@divyanshusharma5571398u/air-curtains-in-multiplex-malls-how-cinemas-keep-cooling-efficient-between-lobbies-screens-15c6eec7d8d7