Electromagnetic door holders will allow a fire door to be held open electro-magnetically allowing a free flow of traffic. In the event of a fire (or power failure), the magnet is released and the door closer will close the fire door securely to help limit the spread of fire throughout a building. This type of door control is ideal for busy corridor doors as found in hospitals or schools.
The Briton 533 is a 24V DC Electromagnetic Door Holder with a 200N holding force. This product has a silver finish.
The DORMA EM500A is an electromagnetic hold open door retainer that is suitable for use with overhead door closers and floor springs.
The Arrow 800 Series Electromagnetic Door Holder operates at 24V DC. It has a 200NM Holding force and has a silver finish.