I believe the in-line fuse to my heater/defroster is 8 amp. I'd think a 20 amp would allow your motor to sustain damage if a short occurred. I don't think the windings in the motor would handle that much current.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.