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Re:Insulation: First the body, then the home (2011) by brnt on Tuesday January 31, 2023 @08:57AM (#34595017)
That's clever, but this [1] is already common and I guess not much worse?

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

Re:Insulation: First the body, then the home (2011) by nice__two on Tuesday January 31, 2023 @11:18AM (#34597119)
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.