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Learn about different types of garage doors, such as sectional, roller and swinging, and their advantages and disadvantages. Find out how garage doors are made of various materials, such as steel, aluminum, wood, fiberglass and vinyl, and how they can be insulated for thermal and acoustic performance.
Learn about the origin, function and design of doors, from ancient Egypt to modern times. Find out how doors are made of different materials, such as wood, stone, metal and glass, and how they can be hinged, sliding, folding or automatic.
Lumber is wood that has been processed into uniform and useful sizes, such as beams and planks. It is mainly used for construction framing and finishing, and is referred to as timber in some regions. Learn more about lumber terminology, re-manufactured lumber, plastic lumber and lumber history.
A recloser or autorecloser is a switchgear that detects and interrupts transient faults on overhead electricity distribution networks. Learn about the different classes, operating principles, history and purposes of reclosers in electric power engineering.
Learn about the revolving door, a device that consists of three or four doors that rotate around a vertical axis within a cylindrical enclosure. Find out how it works, why it is used, and how it evolved from a patent in 1888 to a modern security feature.
Learn about the origin, evolution and benefits of ceiling fans, a common device for circulating air in rooms or spaces. Find out how ceiling fans work, how they differ from air conditioning and how they are used in various countries and regions.
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