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Windows' properties
2011-11-23 14:24

When are the windows wind and cold proof? Before you buy it, check its parameters that would influence on heating bills.
All factors and exploitation capabilities are described by common European norms. When we buy windows, firstly we should take care of CE sign that ensures that window is produced with European norms. CE sign is complied with information about such parameters like air permeability, water resistance and radiation capabilities. In some cases there is no particular value, but proper product class. Getting to know with window properties, will allow us make a good buying decision.
Heat loss and heat permeability are most important property that influence heating bills. It describes an amount of energy that goes through the window of 1 sq. m. size providing the difference between outdoor and indoor of 1 K. The lower this indicator is, the better. Windows can be described as a energy-saving when the parameter is lower than 1.3 W/sq. m. Some sellers presents glass parameter as a indicator for whole window.

 


 In the other hand, Rw is a coefficient of acoustic isolation. Given on decibels (dB), it determines an ability to damp the sound from outdoor. In contrast to heat permeability, the higher the coefficient is, the quieter the room will be.



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