construction, the frame corners are not bevelled but welded into one unit. As a result, there are no butt joints through which moisture can penetrate into the frames. Their surfaces were finished in the corrosivity [...] this project, which started in 2016, involved more than just bringing the entire building complex into line with the required standards for fire, heat and noise protection. "Another requirement was to [...] UV-resistant, light shade. The pivoting windows are closed by means of four-sided fittings, which lock into their outer frames all around and tighten on all sides. This was the only way to achieve sufficient