Western Window Systems' Series 7600 Multi-Slide Door has a new extrusion profile design, custom thermal break design and technology that enables larger panel sizes, and improved tolerances that allow for operating force improvements while still providing industry leading U-factors. It features large, unobstructed rolling glass panels that stack or slide into pockets to create extra-wide openings for indoor-outdoor commercial and residential living spaces and are available with panels up to 15 feet tall.