Edwards Signaling 1502 Series electromagnetic door holder is a high quality device for use with double doors. The electromagnet assembly is designed for floor mounting. The electromagnet is designed to be floor mounted using the supplied floor mounting plate. Field wiring connections are made to the wiring inside the electromagnet. The catch plate assembly may be mounted to the doors either by through-bolting or by using the concealed surface mounting plates. Designed to be used on self-closing, swinging doors to automatically isolate an area when activated by fire alarm, smoke detection or sprinkler systems. Can also be operated by manual control - wherever the instant closing of doors is necessitated for safety or for convenience. Hospitals - for stairwell doors, room doors, long corridors, schools - exit door (closes all doors at once by pushbutton control); offices (instant privacy by pushing a button on your desk), nursing homes and public buildings. Kidde 1502 Series door holder is an auxiliary device designed for applications that require holding double doors.