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Hold Open Devices
Brands: ASSA
Union Assa Abloy Acoustic Hold Open Door Release Device
The Union Assa Abloy acoustic hold open door release device holds the door open until a fire alarm sounds when it will release the door letting it close and is suitable for use with size 3-7 door clos...
Brands: Dorgard
Dorgard Door Closer
This acoustically
activated fire door retainer keeps a fire door open legally and closes the door in the event of an alarm. Activated after hearing a continuous sound exceeding 65 decibels. Door rele...