The three-chamber system designated to construct the outside door, windows and diffrent types of shopwindows. The thermal break used in profiles 24mm wide,made of polyamide enriched with the addition of multi-directional oriented fiberglass significally increases mechanical strength of the outer and inner chamber in the profile. The IMPERIAL door profiles have a heat transfer coefficient U = 2.2 ÷ 2.3 W / m2K, which classifies them in material group 2.1 according to DIN 4108. The use of brand fittings and a wide range of threshold solutions makes the system very modern and versatile.