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Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types ...
A medical alarm [1] is an alarm system designed to signal the presence of a hazard requiring urgent attention and to summon emergency medical personnel.Other terms for a medical alarm are Personal Emergency Response System (PERS) or medical alert.
Door viewers — small fish-eye lenses that allow residents to view outside without opening the door. Door windows — there are three common methods to add security to windows in or beside doors: security bars and grates, security films (coatings applied to the glass in windows to reinforce it), or breakage resistant windows ( plexiglas ...
Modifications had been made to the door, including to the standard locking system, which affected the warning system that was designed to alert the pilot when the door isn't closed, according to ...
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]
An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.
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