Teresa, I have seen several different "systems" used for securing them. Rather than asking us, I would go shopping for doors. While you are there, ask to see the directions for securing the doors on the unit or units that you like. They should come with directions. Then ask to see the hardware. Some of it can be pretty flimsy. If your home center doesn't want to help you on this, then go to a specialty fireplace store. There are several fireplace and outdoor furniture stores around here and there probably are in your area also.