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.
The 3133SE SENTRONIC® is a concealed in the door, closer/holder designed to provide single point hold-open for fire and smoke barrier doors. Door is held open until current interruption releases the holding mechanism and the door closes. Single lever (track) arm closer is specifically designed for interior doors. Learn More$377.44