When turning on the ceiling fan in the bathroom of my RV I found it a chore to have to go back later to shut it off. I took care of this by installing a simple timer in series with the fan switch.
By leaving the fan switch in the on position, the ceiling fan is now controlled by the timer. When entering the bathroom I twist the timer knob a little and the fan goes off a few minutes after I exit.
Frank Woythal, Andover, New York