Feeling dumb here. Finishing up a remodel and have a Broan InVent fan with ~1/2" lip around the bottom. The instructions indicate attach the fan to the joists with the bottom 1/2 or 5/8" down and then "install the drywall".
Given that I didn't buy any of the magic stretchable drywall to go around the lip and snap back snug to the body, I have no idea of how that would be accomplished without cutting the hole at the outer perimeter of the lip which, in my thinking, is too big of a gap and makes no sense as the lip would provide no value. It also would not enable me to seal the outer gap so that is a no go in my specific air-tight/sound mitigating construction goals.
I can't bypass this issue of cutting the drywall tight to the body by just doing the install as a retro fit as the exhaust pipe is rigid so I couldn't pull it down.
The only thing I can think of at the moment is to bend the lips/flange up (or cut them off) as they seem to only be there for retrofits (two other fans I installed did not have any of these lips). Thoughts?