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The Dorma EM500A electromagnetic hold open device is suitable for use with overhead door closers and floor springs. To avoid inflicting twisting forces on the door leaf it is recommended that the electromagnetic device is fitted in the same horizontal plane as the closing device (or as close as is practical). Failure to do so can result in the door leaf twisting which can prevent the door from closing properly in an emergency.
Electro-magnets for hold-open systems
The statutory regulations which apply in many countries allow fire and smoke check doors to be held open for a limited period of time by electro-magnetic hold-open devices which, in the event of a fire, are de-energized to release the door so as to enable automatic closing.
Benefits for the installer/fabricator
Benefits for the architect/specifier
Benefits for the user
• 24V DC Operating Voltage
• 400N Holding Force
• Designed & Fully Compliant to EN1155
• CE Marked