The Acudor PS-5030 is designed for installation in plaster walls and ceilings, before the plaster is applied. An expansion casing bead with 3" wide galvanized lath, included as part of the frame, provides a clean, tight finish between the frame and plaster and also adds reinforcement. The door panel is finished flush with the plaster. Our unique concealed hinge and screwdriver operated cam latches allow the door panel to operate freely with no binding, sagging or distortion. Rough Opening Should Be 3/8" Larger Than Order Size Door Sizes Shown Are Width x Height