"Bob F" wrote in message
. ..
I've seen a number of older exhaust fans that start very slowly. Turn them
on, they barely turn for up to several minutes, then finally speed up
fairly quickly to normal operating speed. Can anyone suggest why this
happens, and a way to fix them to operate properly?


I've seen this a number of times with bathroom exhaust fans. After removing
the internal parts and cleaning them thoroughly, performance on many of them
improves. Gunk tends to build up on the fan blade which I surmise causes it
to be heavier than the little motor was designed for. If not then I replace
the motor and blade or install a new and improved (Panasonic) bath fan.