We do this in Hungary, too. I'd venture to guess this is probably the same at least in all of ex-Habsburg Central Europe. I don't know how people in other part

We do this in Hungary, too. I'd venture to guess this is probably the same at least in all of ex-Habsburg Central Europe. I don't know how people in other parts of the world can stand the stench of used up air. You won't notice when you're inside the room, but coming from the outside you feel like suffocating. Or maybe where this isn't common, people have active ventilation systems?