Door Closers UNION offers a wide range of door closers to suit most applications and projects. A number of considerations should be taken into account in order to select the correct unit for a particular use. Please contact UNION Customer Service for further advice. Download Door Closer Look Up Table (.pdf, 825 kB) UNION Door Closers EPD (.pdf, 455 kB) Overhead door closersUNION's range of surface-mounted rack and pinion closers includes models with fixed CEN power size rating and closers with adjustable CEN power size ratings. Electromagnetic and hold-open devicesElectromechanical door controls, ensuring safety and convenience. UNION electromechanical door controls are ideal for use on fire doors when linked to a fire alarm or smoke detection system.