NIBCOU4551H 1 HD SOC FLG PVC 80 Dark Grey, 1 Inch

Would this mount to soffit with wood screws?

is the stated 1 ½” size for the od or id of the pvc pipe?

Schedule 40 1.5" pvc pipe is 1.92" od. how is that going to fit inside this flange?

Nibco 4551-h series pvc pipe fitting, flange, schedule 80, 3/4" socket . 3/4 " pvc pipe will fit in the hole, right?