The Lomanco Power Vent is a must in the south. My undersized dedicated AC unit for the upstairs part of the house could barely keep up when the existing vent motor gave up the ghost. This is my second time replacing one of these motors. Mine seem to last around 5 years, running nearly constantly in the summers. You'll know the motor is about to die when it starts getting noisy. You can reuse the fan blade as long as you don't bend it (as in permanently crease it) when extracting the motor from the suspension bracket. Just make sure the fan is relatively balanced, meaning the blades are uniformly shaped from one to the other, before mounting the fan to the new motor. You can set the fan blade on a flat workbench or concrete floor and spin it to evaluate its balance. They're pretty easy to bend back into shape.