I have a bathroom with no window, but there is a duct of about 4 metres which goes through a bedroom (boxed in at top corner of room) and out the back.
The old fan was a cheapy axial thing which I'm sure didn't even blow the air all the way out of the duct.
I went an bought a greenwood airvac S90 fan a while ago which isnt yet fitted but I dont think this has an overrun or humidistat.
I'm happy to get another one as I really need a decent fan to combat the mould which grows on the ceiling, anyone got any recommendations? The duct is 100mm diameter.
Cheers