It was a beautiful day in NY for January, clear skies and 45deg. I'll take it because I got a ton done today.
It's always scary to cut a hole in a perfectly good roof, but I measured twice (more like 5 times) and cut once.
Lots of GE Silicone,should be water tight.
DONE! Black one is a regular vent and the white one is a fantastic fan.
I'm glad I'm past that.