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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 ...
Electromagnetic fire door holders may also be hard-wired into the fire panel, radio-controlled, triggered by radio waves from a central controller connected to a fire panel, or acoustic, which learns the sound of the fire alarm and releases the door upon hearing this exact sound. [20]
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.
Many modern fire alarm pull stations are single-action and only require the user to pull down a handle to sound the alarm. Other fire alarm pull stations are dual-action, and as such require the user to perform a second task before pulling down, such as lifting or pushing in a panel on the station or breaking a glass panel with an attached hammer.
Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. A coded panel is similar in many ways to a modern conventional panel (described below), except each zone was connected to its own code wheel, which, depending on the way the panel was set up, would either do sets of four rounds of code until the initiating pull station was reset ...
The first modern direct-pull electromagnetic lock was designed by Sumner "Irving" Saphirstein in 1969 [6] [7] [8] for initial installation on doors at the Montreal Forum. [9] Fire concerns by local authorities in locking the doors at the Forum prompted management to find a locking solution that would be safe during a fire incident.
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Depressing the bar unlatches the door, allowing occupants to quickly leave the building. [3] Modern fire standards often mandate that doors be fitted with crash bars in commercial and other occupancies where mass evacuation may be slowed by other types of door openers. They are sometimes intended solely for emergency use and may be fitted with ...
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