FF: Extension Rod - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
2100 Electromagnetic Door Holder. Architectural Builders Hardware Mfg. Inc.
Doormouse fire door holder | Hard-Wired | Geofire
LCN SEM7850 Wall Mounted Magnetic Door Holder
WW: No power? No problem! - I Dig Hardware - Answers to your door, hardware, and code questions from Allegion's Lori Greene.
Fire hold open magnets
Electro Magnetic Door Holder
Amazon.com: Electric Magnet Fire Door Holder 70kg Holding Force Basic Wall Mount Hold : Electronics
Questions about fire doors: Everything you always wanted to know - Construction Specifier
Fire Door Hold Back Device Installation
Blazequel - Fire Door Holdback & Closing Systems
Fire Door Retainer - Door Hold Open Magnet
Rixson 980M Floor Mounted Electromagnetic Door Holder/Release
Electric Magnet Fire Door Holder Holding Force Floor Mount hold 60kg DC12V/24V | eBay
Magnetic timed door holder - Envirograf
Wireless Fire Door Holder | Selectrite Hardware - British Made UL and CE rated Door Co-ordinators/Selectors
Fire Door Holder - Surface Mounted - 11KG
dormakaba EM Series Hold-Open Magnets
9409 Allgood Hardware Electromagnetic Hold Open Device
