Re: rooftop vent
i agree. it could be for that, except that there are ribs between the skins about a foot away from the vent on all 3 sides except toward the front, so im not sure if there would be a good air exchange between the skins, at least this is how it is on a Wayne, Im not sure about other manufacturers. after closing it off i have noticed a definite temperature increase as i believe more hot air from my heater is being retained, and not going straight out the top of the bus. i could see it being used to reduce condensation from inside the bus though.