We moved some time ago and in the new washroom there is a lot of dust on the surfaces (I clean it nearly every day but next day there is a new layer). Only source I could imagine is the ventilation system. My guess is there is a missing part like a fabric layer or something on top of the shown part on the picture.
Is this assumption right and how could I add it?
Addition: On one outer side of the washroom is a fireplace. Once we start the ventilation (button for it like for light) when the fireplace is burning, the smoke comes into the washroom.
Best Answer
Your exhaust fan is bringing smoke/soot into your bathroom. Your fan is operating correctly and no screen or filter on it will solve your problem. Make sure the flue for your fireplace is completely open. You might want to keep your bathroom door closed when the fireplace is in use, or at least don't use the fan.