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by brnt 1241 days ago
That's clever, but this [1] is already common and I guess not much worse?

[1] https://www.ventilatieshop.com/terugslagklep-in-ventilatieka...

1 comments

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.