heavy steel doors closed during a fire, to better contain fires within rooms.
Types of Door Closers
There are many different variations on the standard electric door closers too, but most of them are for commercial use, where attaching it to the building's existing electrical and security systems wouldn't be as much of an issue.
*heavier exterior doors.
* Glass door closers don't require you to bolt the device to the delicate glass frame.
*door closers that are capable of attaching to a wide variety of doors.
*garage door up via mechanical action.
