The best development that is used in the production of windows — PVC was the window of self -impedation of the window. It is European development and began to be used very successfully in Russia. Many people order plastic windows with such a system. In Russia, the ventilation problem is quite acute, since in many residential multi -storey buildings the ventilation system works poorly. Issue, still installing plastic windows, the tenant is in a room where there are very few fresh air. In such cases, it is necessary to use the window of self -ventilation of the window, which automatically turns on if the humidity and temperature rises in the room, and how the system of the system is normalized. This system is convenient and makes life more comfortable.