Final answer:
Wood shims are installed in multiple locations around the inside of a door frame to ensure alignment and balance.
Step-by-step explanation:
Wood shims are installed in multiple locations around the inside of a door frame. They are typically placed between the door frame and the rough opening to ensure the door is properly aligned and balanced.
The number of wood shims required depends on the size of the door and the alignment needed. It is common to use at least three shims on each side of the frame, near the top, middle, and bottom. However, additional shims may be necessary to achieve the desired results.