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A residential garage door opener. The motor is in the box on the upper-right. A garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance.
A hinge on each side that attaches to the bottom of each side of the garage door. Using track hardware, a car can be parked much closer to the door, as the door is positioned entirely inside the garage door header when in the open position. Track-type hardware has less arc when raising and lowering the garage door than jamb-type hardware.
The act of pushing or pulling the door triggers the open and close cycle. These are also known as power-assisted doors. In addition to activation sensors, automatically opening doors are generally fitted with safety sensors. These are usually an infrared curtain or beam, but can be a pressure mat fitted on the swing side of the door.
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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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