A manual Prido folding door measuring 5×5 meters has a U-value of 1.34 W/(m²K) fully covered, or 1.47 W/(m²K) with one row of type B1 windows, calculated according to EN12428. A motorized 4×4 m folding door has a U-value of 1.57 W/(m²K). This is approximately 40% better than frame-built folding doors thanks to the sandwich construction with 50 mm polyurethane insulation.