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Utilizing a breaching tool is unnecessary if the door is unlocked and easy to open. [5] [3] [6] [1] If the door is locked, breachers can attempt to force inward-opening doors with a strong kick. The breacher will aim to hit the door near the locking mechanism, but not kick the doorknob itself as one can easily twist an ankle doing so. [7]
A crash bar (also known as a panic exit device, panic bar, or bump bar) [1] [2] is a type of door opening mechanism which allows users to open a door by pushing a bar. While originally conceived as a way to prevent crowd crushing in an emergency, crash bars are now used as the primary door opening mechanism in many commercial buildings.
At night, the door can be unlocked, and only releases the key after it has been locked again. During the day, the door cannot be locked using the normal key. [4] The night mode works as follows: Unlock the door from the outside; Push the key through the lock, so that the key protrudes from the inside of the door; Open the door and enter
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.
Historically, such locks were intended for use at night-time, hence the name. [5] The keyless egress that they offer is a valuable fire safety measure, but may be a security risk if breaking a glass panel (usually in the door) or a nearby small window allows an intruder to reach the knob inside and open the door from the outside.
These doors usually open outward using a secure locking mechanism with multiple pins or hatch dogs to prevent opening while in flight with a large outward-facing pressure differential. This design of door can be lighter than a plug door of the same dimensions due to the need for reinforcing the opening around a plug door. A door plug, not to be ...