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The organization was founded in 1989 [2] by a group of window and door industry professionals in response to mounting pressure from local and national governments to standardize energy efficiency ratings for windows and doors. Before NFRC standardized energy efficiency ratings, each manufacturer developed their own methods.
This replaced the Windows desktop as the primary interface of the operating system. Additionally, the on-screen Start button was replaced by a hidden button in the corner of the screen; Microsoft explained that the Start button was removed because few people used it, noting the addition of "pinning" apps to the taskbar from Windows 7. [1] [2]
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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