The GD-830 series door holder is a fail-safe unit energized by a power supply installed on large-scale building, between fire escape doors. It releases the armature plate allowing the door closer to close the door when the fire prevention system detects a fire alarm or emergency. The electromagnetic door holder are constructed with a PUSH OFF button on magnet for instant release, the door can be open or close manually at any time.

The GD-900 series door holder is a fail-safe unit energized by a power supply installed on large-scale building, between fire escape doors. It releases the armature plate allowing the door closer to close the door when the fire prevention system detects a fire alarm or emergency. The floor mount are constructed with a PUSH OFF button on magnet for instant release, the door can be open or close manually at any time. Also available in wall flush mount installation and optional stainless steel box for surface mount model.