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  2. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    If a fire alarm control panel, burglar alarm control panel, or similar emergency system is triggered, it will cut electrical power to the electromagnetic door holders under its control. The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC ...

  3. Fire door - Wikipedia

    en.wikipedia.org/wiki/Fire_door

    The intumescent and smoke-seal bounding of fire doors should be routinely checked, as should the action of the door closer and latch. Some fire doors are held open by an electromagnet, which is typically wired to a fire alarm system. If the power fails or the fire alarm is activated, the coil is de-energized, and the door closes.

  4. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Eclipse door spring and separate checking mechanism. 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.

  5. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    A fire alarm system is a building system designed to detect, alert occupants, and alert emergency forces of the presence of fire, smoke, carbon monoxide, or other fire-related emergencies. Fire alarm systems are required in most commercial buildings. They may include smoke detectors, heat detectors, and manual fire alarm activation devices ...

  6. Fire alarm control panel - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_control_panel

    A single-zone alarm control panel. A fire alarm control panel (FACP), fire alarm control unit (FACU), fire indicator panel (FIP), or simply fire alarm panel is the controlling component of a fire alarm system. The panel receives information from devices designed to detect and report fires, monitors their operational integrity, and provides for ...

  7. Crash bar - Wikipedia

    en.wikipedia.org/wiki/Crash_bar

    Crash bar. 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.

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