To let a breeze into your room, do your windows open out from the bottom or the top?
If your windows are stacked (upper and lower) which part opens and which part stays fixed?
(Germans with 3D windows don’t count. Lüften is a weird cultish ritual and you should all feel bad.)
Both top and bottom, but opening the top half leaves a gap between the pane and screen while the mechanism for the bottom half is broken, so it falls back down unless I prop it up with a stick.