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Thanks to using of the double glazed units our widows can reduce the heat losses significantly. The low carbon units nave got 2, 3 or even 4 glasses. The basic features of the glazed units, which influenced the thermal insulation are:

- the metal oxides coat on the glass surface, which reflects the thermal radiation,

- the internal cavity between the glass filled with argon - a noble gas ,

- the tight construction of the glass unit,

- using of the warm edge spacer bars to reduce so-called the thermal bridge.

The double glazed units offer many different options like: