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Modern double-glazed sash windows are available. These may have true muntins or "glazing bars", or may imitate them by applying them to the surface of the glazing, giving the appearance of multiple small panes, whereas each sash consists of only one large double-glazed unit. [citation needed]
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]
In 1996 the company expanded and set up a new division, Windowstyle, which manufactures Safestyle's double glazed PVCu windows and doors in Barnsley, South Yorkshire. The company has invested more than £6.5 million in Windowstyle to date, including £2.5 million worth of state-of-the-art glass toughening and processing machinery.
Clear double glazing has a U-factor between 1.8 and 3 W/(m 2 ⋅K) or between 0.3 and 0.5 Btu/(h⋅ft 2 ⋅°F) (about R-2) Clear triple glazing has a U-factor between 0.5 and 1 W/(m 2 ⋅K) or between 0.1 and 0.2 Btu/(h⋅ft 2 ⋅°F) (about R-3). Double and triple glazing are critical for energy efficiency. Single glass windows are no longer ...
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
The double glazing and conservatory industry in the UK is large, with 14,000 window, door and conservatory companies operating. [3]An investigation by consumer magazine Which? indicated that the UK's double glazing industry had a lack of transparency regarding prices, acknowledging the importance of the industry ensuring that all traders were reputable.