A large amount

Also, special attention will need to be paid to metal, which should be strong enough so that your window could last more than a dozen years. You should also pay attention to the quality of the double -glazed window. If you want to keep heat in your house, then the plastic window should have at least two glass -glow chambers. The window on the window should fit tightly to the surface and should not form any steps. If there is at least a small step, then a large amount of dirt can accumulate in this place.