Just installed a Camco version on the MH for all 3 vents, this includes the kitchen "Fantastic Fan" vent too. The fan-tastic fan install was slightyl different than the others, I just sheet metal screwed the cover brackets where they needed to be and all works well. Sure dont want to put more holes in the roof.
I Bought on amazon @ 14.99ea w/free shipping. I have the original max air's on the toy trailer, very comparable in quality, but much cheaper price. All vent are slightly limited from full open but I don't think this will affect venting.