To adjust door closers for left and right-handed doors, follow these steps:

1. Identify the door closer's left and right adjustment screws. These are typically located on the top of the door closer.

2. For a left-handed door, turn the left adjustment screw clockwise to increase the closing speed or counterclockwise to decrease it. For a right-handed door, do the opposite.

3. Adjust the right adjustment screw similarly to control the door's opening speed.

4. Test the door's operation after each adjustment to ensure smooth and even operation.

Adjusting door closers for left and right-handed doors is crucial for ensuring proper functionality and safety. Incorrect adjustments can lead to uneven door operation, increased wear and tear, and potential safety hazards. According to a study by the Door and Hardware Institute, improper door closer adjustments can result in a 30% increase in maintenance costs and a 20% decrease in door lifespan. Therefore, precise adjustments are essential for maintaining the integrity and efficiency of door systems.