1. What are the flange dimensions?
2. What is the mounting screw hole spacing?
3. What is the outlet dimension?
The duct flange is 1-3/4", mounting hole spacing is approx 1-11/16" hole center to hole center, and the outlet diameter is approx. 7/8".
What is the dimension of the square flange?
The dimension of the square flange is 2-1/8" x 2-1/8".
How far does it protrude above the mounting surface? Is there a drawing available?
We have added the drawing the web page. Please review the dimensions there.