The following diagram illustrates how to measure your opening and door.
(A) Measure door width. (A) x (B) = door size
(B) Measure door height.
(C) Measure headroom over door to insure that you have enough room for standard track.A standard track will be 12 inch radius or 15 inch radius. If you have less than 15 inches of headroom then you will need a low headroom track to insure room for door to operate properly.
(D) Measure inside door jamb .You will need 4 inches of solid jamb on each side of the door to attach the tracks.
This information is to help give you a idea of what you will need and to help the DO-IT-YOURSELF purchases. We include a site inspection with all install purchases.