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The operator may or may not include a return spring to close the door in case of power failure while the door is open. Operators are often categorized by the means by which the motor's energy is applied. Electromechanical—the motor uses purely mechanical means to open the door: gears, cams, levers and such. This is the preferred type in the US.
Modern openers have “force settings” that make the door reverse if it encounters too much resistance while closing or opening. Any garage door opener sold in the United States after 1992 requires safety eyes—sensors that prevent the door from closing if obstructed. Force settings should cause a door to stop or reverse on encountering more ...
A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]
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