3 ms·

Berbel has a unit that opens when using the unit and closes, when not in use. Quite ingenious, if you ask me. [1]: https://www.berbel.de/dunstabzuege/zubehoer/

• brnt 4y ago
  That's clever, but this [1] is already common and I guess not much worse? [1] https://www.ventilatieshop.com/terugslagklep-in-ventilatiekanaal-150mm/ https://www.ventilatieshop.com/terugslagklep-in-ventilatieka...
  • nice__two 4y ago
    It is much worse. The Berbel retains the insulation provided by the wall, when closed. This is nothing more than a fancy hole in the wall. Opening and closing, means you get the best of both worlds.