Panda Windows & Doors’ TS.83 Thermally Broken Multi-Sliding Door System provides a contemporary solution for large openings in more extreme climates. Interior and exterior extrusions are crimped together using isobars made of polyamide, creating a U-value of 0.29. Panels can be grouped together, reach 12 ft. high, up to 6 ft. wide, and accommodate approximately 7 to 8 lbs. per sq. ft.