A window from plastic

According to GOST 23166-99, there are 5 grades of window structures. They are divided by the degree of resistance to external loads.

During the installation of a window from plastic, a professional is obliged to make the correct calculations, taking into account a large number of factors. This is the shape of the building, the number of floors and climatic conditions. You should also take into account the wishes of the customer for the window. Whether it should be opening or deaf, the number of caskets, the need for the installation of imposts for additional rigidity.