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A plug door is a door designed to seal itself by taking advantage of pressure difference on its two sides and is typically used on aircraft with cabin pressurization. The higher pressure on one side forces the usually wedge -shaped door into its socket to create a seal, which prevents it from being opened until the pressure is equalised on both ...
Designers of commercial buildings must install a vestibule between the main entry doors leading to spaces that are greater than or equal to 3,000 square feet (280 m 2). One other requirement of the design is that it is not necessary for both sets of door to be open in order to pass through the vestibule, and they should have devices that allow ...
In organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (−O−R 2 Si−O−SiR 2 −, where R = organic group). They are typically colorless oils or rubber-like substances. Silicones are used in sealants, adhesives, lubricants, medicine, cooking utensils, thermal insulation, and ...
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A revolving door has three or four doors that hang on a center shaft and rotate around a vertical axis within a round enclosure. In high-rise buildings, regular doors are hard to open because of air pressure differentials. In order to address this problem, the revolving door was invented in 1888 by Theophilus Van Kannel of Philadelphia ...
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