I have just moved into a flat and too my dismay the extractor fan in the bathroom is not working, well it's barley working. It is a circular fan whereby you can unscrew the middle part. I suspect that the air is being sucked out through a pipe which runs across all the flats on my floor (second of eight). I have a larger fan in the kitchen but that seems to be working fine. Do you think it's possible to fix it or am I better fitting a new one? BTW I have a couple of feet above the bathroom before it reaches the flat above me.