Hey folks, purchased some RV windows (30x15) for my CCT. The windows came with no instructions or hardware. The trim rings have holes predrilled (six horizontally top and bottom and two vertically each side, brand is ToughGrade, purchased on Amazon.
Looks like there is a groove around perimeter of window frame to receive the screws once installed in sidewalls. Do these need to be pre-drilled or will the screws just bite into the groove? Also what size screws recommended? The windows are 1.5" finished depth which should work well since my interior walls are 3/8" plywood and frame members are 1"x1.5" aluminum with 1" foam insulation boards in between.
Thanks!