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Http://www.doubleglazing.com/windows/cost-of-double-glazing/

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Double glazing is nothing but insulating glass that has a minimum of two or more glass panes. The glass panes are either separated by a vacuum or space filled with gas so that there is not much heat transfer from the building's envelope part around. These glasses are also helpful http://jasperbtka48159.digiblogbox.com/13412578/what-exactly-is-upvc-double-glazing-and-the-way-do-you-use-it-for-your-advantages

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