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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.
Fire doors need to be closed in case of fire to help prevent the spread of fire and smoke. Any fire doors which are normally held open must automatically close and lock when a fire is present in the building. The function of an emergency exit rim device (crash bar or panic bar) will permit escape through a fire door, however it must re-latch ...
Wireless, battery-operated, fire door retainers can also be used to safely and legally hold fire doors open. Rated fire doors are tested to withstand an ASTM E119 standard time-temperature curve for a specified period. [8] There are 20, 30, 45, 60, and 90-minute-rated fire doors that are certified by an approved laboratory designated as a ...
A fail-secure locking device remains locked when power is lost. Fail-safe locking devices are unlocked when de-energized. Direct pull electromagnetic locks are inherently fail-safe. Typically the electromagnet portion of the lock is attached to the door frame and a mating armature plate is attached to the door.
Magnetic smoke door holders and retainers are wall-mounted solenoids or electromagnets controlled by a fire alarm system or detection component that magnetically secures spring-loaded self-closing smoke-tight doors in the open position. The device demagnetizes to allow automatic closure of the door on command from the fire control or upon ...
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