Installed a Hengs vortex insert from inside. Less complex and didn't have to get on the roof. $70 at PPL. You remove the crank handle and screen. Then insert the fan from inside and use he screw holes to mount it. Gears line up and a hand crank is replaced with a turn knob handle.
Push on. Push off. No fancy thermostat. Or motorized hood riser. Not reversible. No rain sensor. But guess what? In the bathroom I don't need all those bells and whistles. Wired into the light fixture.
There are two models. One with speed control and one without. I bought two more and will be installing in the bedroom and kitchen tis week.
2014 FR330 DS