Sound insulation of plastic windows v one of their major properties. In a modern profile the double-glazed window is responsible for it. Good sound insulation of the PVH windows in many respects depends on quality of production of a double-glazed window.
The noise making harmful effects on a human body became the real disaster recently. The main sources of city noise are the industrial enterprises and moving transport, especially along big highways where in the afternoon noise level reaches 80 dB.
The sanitary standard of noise for premises - 40 dB in the afternoon and 30 dB at night.
