You do actually get 'trickle vents' on windows in UK new builds (I think there is a regulation requiring some sort of passive or mechanical ventilation). Basically a letterbox like slit above the window. Problem is that it doesn't air the room very well when it is open, and you can usually only close it with a sad little plastic flap so all the soundproofing and thermal insulation of the window is made pointless..
You do actually get 'trickle vents' on windows in UK new builds (I think there is a regulation requiring some sort of passive or mechanical ventilation). Basically a letterbox like slit above the window. Problem is that it doesn't air the room very well when it is open, and you can usually only close it with a sad little plastic flap so all the soundproofing and thermal insulation of the window is made pointless..