I have another potential option, but we do not have an upgrade kit for a 14"x14" vent available. And to be completely honest, it wouldn't be the best route to go anyways. By the time you buy the upgrade kit and motor, it is going to cost you almost or as much as a brand new vent with powered fan.
I know you mentioned not wanting to do a complete replacement because your current one is under warranty, but your best option is a complete replacement and it will come with a warranty. So it... view full answer...
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