Clopy Doors
Sectional doors are the most widely used upward acting doors today. They are typically constructed of four or more horizontally hinged sections which are raised and lowered with the assistance of a spring counterbalance. Sectional doors are guided open and closed by continuous tracks on each side of the jambs that allow the door to move upward, resting horizontally above the opening, vertically, or at an angle along the wall above the opening.
