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NanaWall says its SL84 bi-fold door is the slimmest, most energy efficient bi-fold door available, with the intersection of two folding panels at 3-7/8 inches. Panels are capable of heights up to 11 feet 6 inches. A newly designed Gothic Arch roller system borrows design ideas from bullet trains so only the sides of the roller touching the track. This allows for smooth and easy operation. The patented TwinX enables the system to meet higher wind loads but also conceals the hinges.

What the judges say: “Love the slim lines and the large spans.”