What should be a glass packet in a metal -plastic window
Double -glazed window, at least should be two -chamber and have at least thirty centimeters in thickness.
Double -glazed windows with a large number of cameras, respectively, have better tightness, heat and noise insulation.
Furniture on the windows should be fulfilled according to generally accepted European standards, aesthetic, durable, easy to operate regardless of humidity and temperature.
The presence of two or three turns of the circuits in the wings ensure additional tightness.
In addition to the above characteristics, the manufacturer has a large role in the qualitative functioning of the windows. Before buying, you need to make certificates about firms offering their products, get acquainted with customer reviews and only after that, choose the most suitable options.