I purchased this Martec fan to 'match' a smaller one installed in the toilet. While this fan externally matches the look, it is no match to the smaller version in the build. The exhaust vent on this fan clips on, and found it kept coming un-done from the fans force, while the smaller one screws on. We had to tape the exhaust vent onto the unit to fix the design issue.
After a few weeks the nut holding the fan on came loose and the fan was rattling around. So again had to 'repair' another fault.
Otherwise the fan sucks well, not whisper quiet as some claim.
Generally don't mind Martec products, but this one is pretty poor for the price.