Electromagnetic Door Holders/Releases Designed for virtually any remote door release application, electromagnetic door holders/releases can be be tripped by an alarm or smoke detector or triggered by a remote switch. Floor MountedAvailable for single doors or two doors mounted back-to-back, adequate space must be considered for floor mounted holder/releases. Wall MountedAvailable with surface or concealed wiring, wall mounted holder/releases meet a variety of application requirements. AccessoriesHeavy duty industrial use holder/releases are ideal for applications such as overhead rolling doors, guillotine doors, fire dampers and self-closing windows.