It is a three-chamber system intended for construction of external doors, windows and all types of window displays. Thermal break 24 mm wide used in the profiles, reinforced multidirectional glass-fibre, considerably improves mechanical resistance of the internal and external chambers in the profiles. The thermal break is additionally equipped with Coex sealing thread that forms a reliable moisture insulation and an excellent vapour barrier during the process of heat treatment of the powder-varnished profiles. IMPERIAL door profiles have heat transfer coefficient of UR=2.2÷2.3 W/m2K, which ranks them in the material group 2.1 according to DIN 4108. Owing to parameters: significant width of profiles equal to 65 mm (window and door frames, columns, door leaves) and 74 mm (window leaves) and wall thickness 1.7÷2.0 mm a rigid, static profile has been achieved, which enables construction of doors with maximum leaf dimensions: width 1 300 mm - with maximum height of 2 200 mm, width 1 200 mm - with maximum height of 2 400 mm. System for filling fixing: from 4 to 51 mm (enabling also external glazing), use of branded fittings as well as a wide array of threshold solutions make the system state-of-the-art and universal. IMPERIAL windows offer the advantage of proper matching of the leaf to the window dimensions (several types of window frames and leaves) and enable selection of the leaf depending on the fittings – some windows are suitable especially for aluminium fittings, according to EURO standard, as well as to PVC fittings.