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Window blind
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===Vertical=== [[File:Vertical blinds at noon.jpg|thumb|Vertical blinds, vanes are rotated to semi-closed position]] Vertical blinds were introduced in 1948 (Flexible Blind Company, [[Hunter Douglas]]{{sfn | Abercrombie | 1995 | p=250}}), and gained acceptance as an alternative to [[draperies]] due to the streamlined look, versatility, energy efficiency, large variety of finishes.{{sfn | Madill |1995 | p=38}} The construction includes a horizontal (occasionally, in custom designs, tilted) ''track'' with moving ''carriers'' and vertical strips, called ''vanes'', hanging off the carriers{{sfn | Madill |1995 | p=39}} (attached by ''clips''). The vanes can rotate, changing the amount of light entering the room, and, when in open position, traverse the track (and thus be stacked compactly on one side of the window). When closed, the vanes tightly overlap, creating a good barrier against the sunlight penetration in summer and energy loss in winter.{{sfn | Madill |1995 | p=38}} Unlike horizontal blinds, vertical blinds are less likely to collect dust because they stand vertically. Since they draw to the side rather than lifting and lowering, they are easier and faster to operate. They operate best on patio doors and sliding windows that slide from side to side. In the 1970s there were few choices of fabric- usually beige or white, which had to have stiffener embedded to prevent fraying, rather like on roller blinds fabric but using a thicker textile. Vertical blinds became available in flat plastic (PVC), fabric, embossed PVC, also S-curved slats. A more modern modification is to offer them with wood trim at the top and bottom—sometimes midway as well—and these are usually described as "Japanese Vertical blinds" because they are often coordinated with Japanese style Shoji blinds using the same timber. Vertical blinds were most popular in the UK during the 1990s, since then sales have slowed as they lost popularity with a younger generation. Stationary vertical blinds are hung in the doorways of some homes and businesses which generally leave the door open. Movement of the blind may signal a change in airflow, or someone entering the doorway. More commonly, however, these vertical blinds are made of thick plastic. In the cold rooms of food businesses, this slows the heat leakage into the cold room. In warmer climates, vertical blinds discourage flies and some other insects from entering the building. In certain areas of the UK window blinds are used to disguise the fact that offices have PCs in them and are used as a burglary deterrent.
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