(U.S. Patent No. 4,609,027)
Get the Highest Clearance of Any Bi-Fold Hangar Door on the Market
Our patented, high-clearance door support arms are located on each side of the Hi-Fold door. The auxiliary arms enable the door to open completely while requiring less overhead space. As the door rises, smooth-rolling steel wheels on the arms contact the optional reinforcement rails on both jamb posts to provide strong, dependable support. Our auxiliary arms are made of heavy-gauge square-steel tubing with self-concealing chain followers.
A double-strength center hinge, welded-steel wind trusses, and strong, vertical joints combine with the auxiliary arms to hold the door in the horizontal, fully open position, with minimal deflection.
