Chain—Doors that open with a chain include the chain pull. Mount the chain on either the right or left side of the door.

8 Cycles per Hour—Doors with 8 cycles per hour have an internal electric motor. It's already wired to the door, so you only need to connect the included switch to get these doors moving. However, internal motors aren’t as powerful as external motors, so these doors operate at slower speeds. Because these doors only open and close eight times an hour, they’re suitable for use in areas with light traffic. They can be mounted either on the face of a wall or within a door jamb. In a door jamb, they require 8 1/2" of headroom, 8 1/2" of jamb depth, and 5" on each side.

30 Cycles per Hour—Doors with 30 cycles per hour have a powerful external, direct-drive motor, so they operate faster than internal motor doors. Because they can open and close up to 30 times an hour, they’re suitable for medium-traffic areas. However, external motors require more installation space. In addition to a remote, they also have a control box used to open, close, or stop the door. It has a timer you can program to automatically close the door after a set duration. The control box is rated NEMA 4X to seal out dirt, dust, and water from washdowns. A safety sensor at the base of these doors will stop them from closing if an obstruction is detected. Mount these doors on the face of a wall. Sized to be slightly larger than your door opening, they fit over imperfectly aligned doorways without an issue.