Door Closers

Door closers have many uses other than just closing a door. First they help commercial buildings be more energy efficient. They make sure doors that have limited access close behind the people that are key holders. Door closers also control the rate in which they close so that the door doesn't hit you in the back. Most importantly they control the rate a fire can spread through a building. As a result many local fire codes require them. Door closers work with springs and hydraulic fluid to c...
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