Electromagnetic door holder. Ruggedly constructed and attractively designed. The housing is finished with an aluminium colour, durable baked polyester powder paint. The floor or wall section houses the electromagnet while the contact plate attaches to the door. The contact plate has a shock absorbing nylon (swivel) ball which allows the plate to adjust to any door angle. Wall units are available in flush or surface mounted versions. Edwards door releases should be installed wherever doors may be effectively used to confine smoke and fire or where the release of a self-closing door from a remote location is desirable for other reasons. Fail-safe operation is an inherent feature of Edwards door holder releases. If power fails, doors are released automatically but may be opened or closed manually at any time. All units are free of moving parts are self-contained and require no maintenance. These door holder-releases have a holding force of approximately 25 lb. The device holds a door open while energized. When de-energized by a relay controlled by the fire alarm system or other switch, the door is released to a closed position, checking the spread of smoke and flames. Electromagnetic door holders should be used and installed in accordance with local building codes and standards. The electromagnet portion consists of a floor plate and a floor housing which when installed with gaskets provided, form a weatherproof electrical junction box. Incoming conduit connects directly into floor plate.