Dorgard Acoustic Hold Open Door Release Device

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 or a general noise level exceeding 80 decibels.

The door releases 14 seconds after sound activation.

• Overall height - 205mm
• Casing height - 150mm
• Width - 195mm
• Depth - 45mm
• Built in safety feature releases the closer if the general noise level exceeds 80 decibels.
• Automatic night time release facility.
• Battery operated wireless unit.
• Complies with BS EN 1155.
• Complies with BS 7273-4 Cat C.
• CE marked.
• Black supplied from stock but other colours available by special order.
• Operation: Activated after hearing a continuous sound exceeding 65 decibels, 14 seconds after sound activation the door is released.