The Braun series of ultra quiet ceiling fans(XB80)specify they are to be controlled by
an ON/OFF, mechanical, or relay type of switch. They cannot be speed controlled.
The line voltage is fed to a 2 by 8 inch circuit board that converts the AC to DC.
The fan is just too quiet to not have some kind of timer on it. An Amazon customer left a review
of the Maestro MA-T51MN, saying it worked just fine on his XB80, but that was one positive against many
warnings. Anybody got an opinion? Dale.