Windows allow you to fill the room not only with light, but also with fresh air. To do this, in the frames of old wooden windows, the windows were provided, however, the frames themselves were also opened, allowing to look out, wash the window and ventilate the room well. Now plastic windows are installed almost everywhere, the design of which is different from wooden. But ventilation is required in this case. Some manufacturers of cheap plastic windows construct a window box so that the wings do not open completely or open on a small angle. It’s not very convenient. So that both window sash can be opened completely, as well as each of them separately, impost is used. This is a vertical plastic profile with an increase in the steel made inside him. Impost usually divides the window into two parts of the vertical line, while two sashs are formed, freely opening at a large angle and not interfering with ventilation. In addition, the possibility of opening a window opening allows you to completely transfer large items through it, which is sometimes extremely necessary. For example, you can thus deliver a large closet to the apartment. Impost is attached to the rest of the window profile details in two ways: mechanical and welded. In the first case, steel bolts and special fasteners are used, and in the second – the sail. It should be noted that the welded impost, of course, is ahead of the strength of the mechanical fastening. He can withstand very significant loads, reliably protecting the frame from defects and deformation. Also, thanks to the hermetically soldered impost, you can no longer be afraid that a fungus or mold will start in the frame. It is also important that this structural element is perfectly opposed by wind loads.
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