Cassette type air conditioner and smoke detector mounted on ceiling wall. Air duct on ceiling in hotel. Air heading unit on gypsum wall. Cool system in the building. Air flow and ventilation
![aircraft design - What is this white smoke like thing, seen inside the cabin before takeoff? - Aviation Stack Exchange aircraft design - What is this white smoke like thing, seen inside the cabin before takeoff? - Aviation Stack Exchange](https://i.stack.imgur.com/ziKLl.png)
aircraft design - What is this white smoke like thing, seen inside the cabin before takeoff? - Aviation Stack Exchange
![Borker Air Conditioner with Leaking Water, Smoke and Fire, Flat Vector Illustration Isolated on White Background. Stock Vector - Illustration of weather, cartoon: 266115054 Borker Air Conditioner with Leaking Water, Smoke and Fire, Flat Vector Illustration Isolated on White Background. Stock Vector - Illustration of weather, cartoon: 266115054](https://thumbs.dreamstime.com/z/borker-air-conditioner-leaking-water-smoke-fire-flat-vector-illustration-isolated-white-background-overheated-damaged-266115054.jpg)