I'm remodeling my upstairs bath room & want to replace my existing bath/light ventilation fan with a Panasonic unit I just bought, model FV-11VQL4. I figured this is the time, because the ceiling drywall opening is completely different from the old fan to the Panasonic. So, ceiling drywall patching will be in the cards.
First problem, although there is an attic above the bathroom, I really can't get to the fan because the roof slope is so low at that point, I'm thinking I can get this from below, as long as I cut out enough ceiling drywall.
The real issue is the mounting instructions which gives 4 mounting variations. The fan housing is rectangular, with about a 1" flange around the perimeter. One mounting variation shows screwing the flange to the bottom of the ceiling joist & presumably you would drywall over the flange. The housing would then be recessed from the drywall ceiling by the thickness of the drywall. Other mounting variations show the housing protruding past the bottom of the ceiling joist by 7/8". This would have the entire square flange standing proud of the finished ceiling & basically sounds wrong to me. Maybe it would make sense if you cut a fresh opening into a finsihed ceiling, but that won't work for me because I have to mount this from below with exposed ceiling joists.
Anyone install a Panasonic fan/light & can offer some guidance?