Kolbe’s Ultra Series Folding Window aids in designing open spaces with expansive views, fresh air and natural light. The window complements the company’s folding door line with matching profiles. It accommodates up to eight panels on each side, spanning more than 50 ft. with each panel as wide as 39 3/8 in. and as high as 72 in. Double-pane insulating glass with LoE2-270 coating, 3-in. stiles and rails and 1 3/4-in.-thick pine wood construction are standard.