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Amount of heat that “escapes” through windows is defined by the U-factor (coefficient of heat transmission through windows). There is a general rule that the lower the U factor, the better the thermal insulating properties of windows. When a three-chamber FORIS 100 system is used the U-factor for window profiles is Uf = 1,6 W/(m2xK) whereas the five-chamber FORIS 500 system makes it possible to reach the U-factor value as low as Uf = 1,2 W/(m2xK). In combination with excellent thermal insulation of glazing panels where the corresponding U factor is Ug = 1,0 W/(m2xK) savings on heating costs can reach even up to 60%.