I would not use the pvc pipe or similar method on this. The end result might be to ever so slightly bend the rear housing and forever take the bearing out of alignment. You're better off trying to drive it out from the back side, either by slightly overdrilling the holes where the motor mounts go through and using a drift punch to catch the edges of the stator or through the rear vent holes, at an angle away from the windings. Using a pvc pipe, end of a hammer, etc, is a real risk on stamped steel housings. That process is better used for cast iron and, even then, cautiously with many fans. You can also freeze the whole motor casing, stator and all, then quickly heat the outside of the case while trying to drive the stator out. Sometimes that creates just enough of a gap in the freeze/heat between the case and the stator.