"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 assume you are talking about the motors without a capacitor and a start
terminal. These motors develop weak torque until reaching full speed. The
lubrication gums and the motor spins slow for awhile. It is best to
dissasemble the motor, degrease the bearings and apply a light oil (like 3
and 1 motor oil).