A few weeks ago I upgraded our '94
Scamp 16 from what I assume was the original 6" fan in a 12" hole (!?!) to a
Dometic Standard Fan-Tastic Ceiling Fan Vent without Thermostat #1631 from Camping World. I went the no frills route, with no thermostat or rain sensor for simplicity, and hopefully durability.
To preserve interior headroom I built a frame (from scrap 3/4" treated plywood) to raise the fan 3/4" on the OUTSIDE and the unit mounts to that.
I used the pre-drilled holes in the fan body to locate the holes in the plywood frame and the
fiberglass shell. I primed and painted the plywood frame, then used butyl tape between both the
fiberglass shell and the plywood frame and the flange on the fan. I bolted thru the flange, plywood frame and
fiberglass shell with stainless steel bolts, washers and nylon insert locknuts, then caulked all seams and bolt heads.
Upon completion the locknuts are hidden in the rat fur and the trim bezel is flush with the rest of the ceiling.
The new fan moves MUCH more air, even on low setting, than the noisy old 6" unit ever did. We are heading out again in a couple of weeks and will put it to the real test if the weather cooperates! (If temps stay in the 30's at night we won't be needing the fan much!)