Door closer of Steel Fire Door first function is to buffer damping effect, quickly open the door to the occurrence of damping positioning, and the damping force can be self regulating strength and scope. The effect against forced open the door when the door lock or fast collision wall, or emergency escape against people in the fast open fire door. It is also because people are flurried, too big to cause great counterforce, to prevent the huge reaction to hurt people.
The second function of the China Steel Fire Door is slow down the door, it can be adjusted according to the specific impulse. It is more suitable for using in occasions with many people, especially in hospitals, welfare homes and so on.