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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.

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.

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