To adjust a door closer, follow these steps:

1. Locate the door closer and identify the adjustment screws. These are typically found on the top or side of the closer.

2. Turn the adjustment screw counterclockwise to increase the door's closing speed or clockwise to decrease it.

3. Test the door by opening and closing it several times to ensure the desired speed is achieved.

4. If the door slams shut too hard, adjust the spring tension by turning the tension screw clockwise to decrease the force or counterclockwise to increase it.

5. Check the door closer's alignment and make any necessary adjustments to ensure the door closes smoothly and evenly.

Adjusting a door closer is essential for maintaining the functionality and safety of a door. According to the National Fire Protection Association (NFPA), doors in buildings must close within 15 seconds to prevent unauthorized access and ensure fire safety. An improperly adjusted door closer can lead to doors that are too slow or too fast, compromising security and fire safety. Additionally, a door that closes too hard can cause damage to the door, frame, or other adjacent structures. By properly adjusting the door closer, you can ensure that the door operates efficiently and safely, contributing to the overall home improvement and security.