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2. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   Wall-mounted electromagnetic door holder securing a door in the open position. 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.

3. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   Because the mating area of the electromagnet and armature is relatively large, the force created by the magnetic flux is strong enough to keep the door locked even under stress. Typical single door electromagnetic locks are offered in both 600 lbf (2,700 N) and 1,200 lbf (5,300 N) dynamic holding force capacities.

4. Doorstop - Wikipedia

   en.wikipedia.org/wiki/Doorstop

   A newer version of equipping the door with the stopping mechanism is to attach a magnet to the bottom or top of the door on the side which opens outward, which then latches onto another magnet or magnetic material on the wall or a small hub on the floor. The magnet must be strong enough to hold the weight of the door, but weak enough to be ...

5. Electromagnetic shielding - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_shielding

   As soon as an electric field is applied to the surface of an ideal conductor, it induces a current that causes displacement of charge inside the conductor that cancels the applied field inside, at which point the current stops. Similarly, varying magnetic fields generate eddy currents that act to cancel the applied magnetic field. (The ...

6. Door chain - Wikipedia

   en.wikipedia.org/wiki/Door_chain

   A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [ 2 ]

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