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WW: No power? No problem! - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
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Blazequel - Fire Door Holdback & Closing Systems
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Electro Magnetic Door Holder
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FF: Extension Rod - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
SDC EH Series Magnetic Door Holder & Releasing Device
FF: Mag-Holder / Mag-Lock Conflict - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
Magnetic timed door holder - Envirograf
Amazon.com : Electromagnetic Door Holder Fire Proof electromagnetic Releaser : Office Products
Durable magnetic door holder,Fail-unlocked Fire door magnetic door holder,Hold Open Magnets with signal output,Nordson
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Fire hold open magnets
China Metal Cover 24V Floor Mount Magnetic Door Holder for Fire Doors Magnetic Door Hold Open Device Photos & Pictures - Made-in-china.com
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dormakaba EM Series Hold-Open Magnets
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Questions about fire doors: Everything you always wanted to know - Construction Specifier
