A properly adjusted door closer ensures your door swings shut smoothly, securely, and at just the right speed. If you've installed a UL 63Z0 16100 door closer—or inherited one in your building—you might be wondering how to fine-tune its performance. Maybe the door slams too hard, closes too slowly, or doesn't latch properly.

There are many reasons why a door can not close properly. A bent hinge or a sprung frame may be causing this problem, and these can be fixed by replacing the door. Air pressure can also be a problem, and it can oppose the motion of a door closer. In some cases, it may be necessary to replace the ent