Mag Hold Open

See Door Holder. An electromagnetic device that holds fire doors open during normal operation and releases automatically upon fire alarm activation. Mag hold-opens are the only code-compliant way to prop fire doors open.

Components include an electromagnet (wall or floor mounted) and a metal armature plate (door mounted). When energized, the magnet holds the armature with 20-80 lbs of force. Fire alarm signal removes power, releasing the door to close via its closer.

Installation requires connection to the building fire alarm system and a dedicated power source. Single-point and multi-point configurations are available. Wall-mounted holds work for standard swing; floor-mounted accommodates various angles. Related: fire door, door holder, door closer. Shop electromagnetic hold-opens.

Related Terms

Knock Down Frame

Transom Closer

Touchless Door Opener

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Since 1938, American Doors has supplied commercial doors, frames, and hardware across the U.S., growing from a Houston-based distributor into a multi-market platform serving contractors throughout Texas and Colorado. Family-owned for more than 85 years, we emphasize continuity and craftsmanship, with AHC-certified hardware specialists and experienced estimators delivering fully coordinated Division 8 and Division 10 solutions from specification through installation.

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