Heavy duty door closer
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Door Closers are devices that automatically close a door after it has been opened. Their primary purpose is to comply with fire safety, ensuring that fire doors are never left opened in a way that might facilitate the spread of a fire.
How do door closers work?
Some door closers use an air cylinder which, when opened, fill with air. As the door closes, a piston forces the air out of the cylinder. A hole controls the rate of closure, and this is often adjustable. Hydraulic door closers work in a similar way, but instead use an oil to slow down the closure.