A ceiling fan electrical box supports the weight of a fan and provides a junction point for wiring. Typically, the box also has knockout holes for the wires and is fitted with nonmetallic cable clamps to protect the wiring. It’s important to select the correct type of ceiling fan box for your house and install it according to the manufacturer’s instructions. If you have questions or concerns, consult a licensed electrician.
Turn Off the Power
Before starting any electrical work, turn off the power to the room in which you’ll be working. This will ensure that no one accidentally turns the power back on while you’re working. If there is no label on the breaker switch, use a circuit tester to find the switch that controls the room’s electricity and change it to the “off” position.
Inspect Your Outlet Box
If the house has been previously occupied, look for a brace to support the outlet box. The builders who framed the house may have attached the box to a woodblock between joists in the ceiling. If you can’t see how the box got braced, consider purchasing a fan rated box that has built-in bracing or a brace kit.
You can purchase a fan box from any home improvement store or online. They come in both round and octagonal, new-work and old-work, and with various mounting options. Some are side-mount with a tab that you screw to a joist, while others have a hanger-style arm that extends between two joists and gets screwed to both.