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A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50° C, indicating how the concept may have started: [2]
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Overhangs are used to block direct sunlight in the summer, and allow it in the winter, and heat reflecting blinds are inserted between the thermal wall and the glazing to limit heat build-up in the summer months. Another study [42] analyzed double-green skin facade (DGSF) on the outside of high-rise buildings in Hong Kong. Such a green facade ...
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A clear example is an airspace; the R-value of an 1/2 inch airspace is about 1 (in US units), while the R-value of a 4 inch space is virtually the same. The FTC determined that the potential for misleading claims was so high they essential banned the use of "R-value per inch" as an advertising claim.
The foil plant was shut down in May 1990 after the company had the plant on the market for two years. The final products made there were honeycomb foil used in the aircraft industry and coil for window blinds. Kaiser Aluminum and Chemical were trying to get out of the foil business. The final 100 employees were laid off with the shutdown. [69]
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