Ordered two of these fans to replace existing lower rated fans in the main bathroom and an ensuite off the main bedroom. Easy to install, with clear instructions for wiring alternate connections for high or low speed running and timer setting. I wired them on high speed and set the timer on for about 25 minutes. Fans are relatively quiet because they are in line and not fitted to ceiling which usually causes a lot more noise.
Now in in situ for a week and condensation problems in main bedroom and other parts of house have virtually disappeared even although we have been experiencing extremely low night and day temperatures during this winter spell. JOB DONE!