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Kolbe’s Folding Door Systems’ panels fold back against each other to create an opening up to 45' wide. With a maximum of eight panels per side, the folding doors have an optional 4-5/8" bottom rail to accommodate LoE2-270 glass and provide better views when the doors are closed. A proprietary thermal weep improves the door’s energy efficiency, and optional features include concealed hardware and mortised hinges. Three configurations are available: In the first, all panels fold to one side; in the second, panels split and fold on one side of the opening. A floating option allows panels to be folded to either side. kolbe-kolbe.com