The inner flange is 1.25 inches. The outer flange on top is 1 7/8 inch, the bottom flange is 7/8 inch. Width of opening past inner flange is is 20 1/2 inches long by 6 7/8 inches high.
FAQ Installation I see the overall dimensions but I am interested in is the opening sizes on the electronic box as there is a flange for the door to rest on.
I see the overall dimensions but I am interested in is the opening sizes on the electronic box as there is a flange for the door to rest on.