Conquest fire door retainers offer an ideal solution for legally holding open a fire door. These electromagnetic door retainers hold a fire door open, which can either be released manually or releases automatically when the fire alarm system is activated. Available in surface or recess mount and 24V DC or 230V AC configurations, the Conquest fire door holders are suitable for a wide range of applications. Geofire Conquest door holders are some of the most popular on the market; manufactured in the UK and compliant to British and European Standards.