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Double Glazed windows are manufactured by having two panes of glass separated with a spacer bar, these panes are sealed across the outside edges from the glass to make a sealed unit, this unit is often pumped with argon gas that windows let much less heat through than do single http://www.mediafire.com/file/d20d8owvez6j1au/Why+You+Should+Choose+Double+Glazed+Windows1.pdf/file


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