[anpat]

Thank you for linking this, I noticed this in every apartment I lived in Germany and was wondering what is it called. The door frame had rubber/plastic dampener that would literally create a vaccum like effect when closing (i.e the room door would slam if I closed the balcony door).

They really made a difference in terms of inside temperature.

Also the ability to tilt windows and even doors (vertically) was an amazing feature.