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Cellular shades are a window covering used to block or filter light and insulate windows to save energy. Cell size can vary. Cell shapes hold trapped air and create a barrier between the window surface and the a room. Since there's no test for shades they can't be ranked, but they qualified for a 2011 US energy tax credit.〔(【引用サイトリンク】title=Is it Worth It? Honeycomb Shades )〕 In 1985, Hunter Douglas launched the Duette Honeycomb Shades line which featured the honeycomb construction used today. Many brands now offer similarly constructed shades, also known as honeycomb shades or honeycomb blinds. Windows and doors make up for approximately one-third of a home’s total thermal loss, according to the Natural Resources Defense Council.〔(【引用サイトリンク】title=Smarter Living: Energy Out the Window? )〕 This applies to heat loss in winter, and entry of undesired heat in summer. When air inside the room comes in contact with windows, it is cooled or warmed. By convection this air then circulates around the room. Cell shapes in the blinds hold trapped air and create a barrier between the window surface and the a room.〔(【引用サイトリンク】title=Is it Worth It? Honeycomb Shades )〕 Shades, however, provide only slight control of air infiltration.〔(【引用サイトリンク】url=http://energy.gov/energysaver/articles/energy-efficient-window-treatments )〕 Cellular shades can be constructed as single cell, double cell, or triple cell shades. Single cell fabric has an R-Value between 0.28 and 0.44 (1.6 and 2.5 imperial), and double cell fabric has a metric R-value between 0.49 and 0.70 (2.8 and 4.0 imperial).〔(【引用サイトリンク】title= Prevent Heat Loss In Your Home: R-Value )〕 A 6 mm (¼”) thick single pane window has a metric R-value of 0.16 (0.91 imperial).〔(【引用サイトリンク】title=R-values of Insulation and Other Building Materials )〕 Unlike window blinds, which are made of hard materials, they are made of a soft paper- or cloth-like material. Typically spun lace and bonded polyester are used, but other fabrics can be used during the manufacturing process. In common with all blinds cellular shades can reduce of solar gain in summer,〔(【引用サイトリンク】title= Residential, Today's Windows & How they Work )〕 and provide black out for sleeping. Also as with other window treatments, they are raised and lowered horizontally with a string. Cordless cellular shades are available to reduce the risk of strangulation for small children.〔(), U.S. Consumer Product Safety Commission, Safety Alert: Are Your Window Coverings Safe? (retrieved 15 April 2015)〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cellular shades」の詳細全文を読む スポンサード リンク
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