To add to the confusion, I swapped out that noisy bathroom (water closet room) fan for a computer muffin fan (best buy, circuit city, etc.) for a few bucks. Just be sure it's a 12v fan. Much quieter and moves considerably more air. We have the maxxair vent cover over that and all other vents on our Montana. Wish we had the fantastic fan or maxxair fan but we don't.
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