The uPVC profiles have European-style grooves for oriented hardware installations, which facilitate the installation of all hardware fittings produced in accordance with European harmonized standards. The fastening screws of the hardware accessories of plastic steel doors and windows are fixed and reinforced by at least two layers of inner walls, which increases the reliability of the use of the hardware. The casement window frame and the fan are sealed with two inner and outer special structure and special material sealing strips, which increases the watertightness and airtightness of the doors and windows.