On our 24RBS, I was surprised to find that the small (5 inch ?) fan would keep the mirror from steaming up when taking a shower. As part of our deal, the dealer supplied a max air vent cover for the outside, which I installed. We had a trip coming up with no electric, so I installed a Vortex II fan. Moves a lot more air, and installs from the inside without breaking the roof seal. I would say it moves about 3/4 as much as a Max Air fan. Jay
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