A door closer is a mechanical or automatic device that closes a door, in general after someone opens it, or after it was automatically opened.
Norton 7705PTDO-120V-689 Master Unit w/ Integral Smoke Detector Power Track Electromechanical Closer-HolderThe Norton Power Track® Closer-Holders combine the functions of a single point electromechanical door holder with the proven reliability of a 7705PTDO Door Closer. The track assembly contains an arm slide and solenoid operated hold open mechanism and is available with an integral smoke detector. The closer is mounted on the door. The Power Track and hook-up box are mounted to the frame face for pull side installations. The Power Track is an aluminum extrusion which incorporates a solenoid actuated cam that locks the arm slide in the track at a selected point. The degree of door hold open is selected by adjustment of the telescoping arm. When there is power to the unit, the door will hold open at the selected hold open point. Any power interruption will release the arm slide and the door will close. The door can be released manually at any time. Learn More$1,130.63
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