YES, I changed out the stock exhaust fan with a MAXX FAN. To compensate for the curved roof, I made a hardwood frame, with curved undersides front and back, and straight at the sides. It is about a half inch thick at the center.
The frame is screwed to the roof from below. Calking bead between and along the outer edges on top. That keeps the Maxx Fan frame from being distorted. I see you went ahead without a frame. Good Luck!
Originally Posted by scf
Wondered if anyone has had experience in installing a Maxx Fan on a slightly curved roof and whether or not a tapered shim is required to flush fit the flange. I have a '98 Scamp
16' and am in the process of installing a Maxx Fan in front of stock original escape
hatch. There is a slight curve side to side from the roof line center to the outside edge of the mounting flange (approx 1/4" drop from center to outside). I was hoping that between a little flex in the roof flange mount and butyl tape along with rv sealant would take up the variation. Any thoughts or experience with this out there?