Turn the power off and unplug the appliance from the wall socket. 2. Access your fan by removing front panel, which is held in place by screws on most models. 3. Disconnect the wiring loom via the plastic joiner and unscrew the nuts holding the fan in position. 4. Clean any dust with a dry paint brush and vacuum the fan blades. You may also vacuum ash and debris from where the fan is located. Clean carefully around the motor. 5. Place two or three drops of sewing machine oil on the shafts at the bearings. 6. Place the fan back into position, following steps 1-3 in reverse.