The closing of doors is important in public places or other buildings where climate control has been installed. It also helps to keep out dust and dirt and gives protection from the weather. This can be ensured by the use of door closures.
These are devices that are spring-loaded and get energized when a door is opened. The spring then pulls the door back into its closed position. Designs of door closers are varied and can vary from closers that operate in both directions to those that work only in one direction. They can be mounted overhead, on the floor, in the hinge, or be concealed.
A concealed door closer is installed in the body of the door and comes in many various designs. Some of them will hold open for a while before closing. Other will delay the closing for a brief period. The speed of closing can also be controlled, so that doors do not slam shut. It makes for improved aesthetics.