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.)
Mine are attached on one side and open outwards. So when fully open (looking down from above) they make an L shape. There’s a little like crank handle you rotate to open/close them.
I don’t really like this style, but that’s what came with the house.
Edit: They’re casement windows, here’s a pic:
I never understood the crank handle for floor level windows, still - pretty unique