How it Works?
Once installed, Dorgard works by listening out for a continuous sound of 65 decibels or higher. Once this sound has been identified, after approximately 14 seconds Dorgard will release the fire door and under the pressure of the overhead door closer the door will close, sealing the area and preventing the spread of smoke and fire.
Click here to view how Dorgard is installed.
As Dorgard is wireless it requires no wiring into the building’s main fire alarm system meaning that disruption during installation is minimal and fast.
When Dorgard is holding a fire door open, it “listens” for the continuous sound of a fire alarm. Dorgard needs to “hear” a fire alarm that exceeds 65 decibels for longer than 14 seconds. At a general noise level of 80 decibels Dorgard will release. This facility has been built into the unit as a safety feature. Should the noise level in your premises exceed 80 decibels it is unlikely that you would hear a 65 decibel alarm, therefore the Dorgard releases the fire door to close.
Unlike electro-magnetic retainers (EMR), Dorgard requires no wiring as it is battery operated and self-contained. Installation is easy, quick and non-disruptive. It is affixed to your fire door with four screws and takes approximately 5 minutes to install. Once you have inserted two C-size batteries (supplied), Dorgard is ready for duty.