Ceiling fans need a special electrical box with a mount designed to keep the fixture stable and secure in place. The box should also be fastened to joists in locations where the attic is accessible. Using the right tool can make this job easier and safer. A dual-purpose structure called a joist hanger is an ideal solution. It’s available at home centers and is designed for new construction and remodel in locations where the attic is accessible. This metal bar fits between joists and has a built-in brace that expands when it’s installed in the hole in the ceiling. It’s simple to install and offers enough strength to support a light or fan.
Before starting, shut off electricity to the circuit breaker or fuse that supplies power to the room’s light fixture. Use a stud finder to locate the nearest ceiling joists. If the joists are not readily visible, snap diagonal chalk lines in opposite corners of the room to determine where the center line intersects. The joist where the center line crosses should be the location of your new fan.
If the old outlet box is nailed to a joist, remove it by forcing loose a nail or two horizontally driven screws with a flat pry bar. Then cut a hole in the ceiling, centered on the joist, and fasten a new fan-rated box to it with drywall screws.
If you can’t reach the attic to fasten a box directly to the joist, purchase and install a joist hanger. It’s an adjustable metal brace that slides through a hole in the ceiling, and when twisted, it contacts the joist on each side of the ceiling outlet box hole. The ends of the brace have sharp, built-in nails that dig into the wood on either side to provide a strong connection.