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...
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...
The BRITON 570 Series Dogging Device Kit is suitable for use with Briton 570 Series panic hardware. It features a manual hold-open function which is operated by key, holding the latch in withdrawn pos...