Dorgard DDH3 Fire Exit Door Holder Battery Operated is the easiest way to remain compliant whilst allowing you to leave your Fire doors open, the Dorgard fits quickly and easily using only 2*C size Alkaline batteries leaving minimal fuss and mess. There is no requirement to wire the holder into the existing fire alarm system. The Dorgard constantly “listens” for a fire alarm activation and in the event that it hears a recognized sound releases the door to ensure that a fire does not spread. Available in a multitude of colors to match many door styles it is the easiest way to allow ease of access for Wheelchairs, ventilation & free movement.