Things You'll Need
Sloped ceiling bracket (for electrical boxes)
Screws from fan kit
Ceiling fan kit, including extension rod
Ceiling fans are designed to hang off level surfaces. This presents a problem when you have a sloped ceiling, such as a cathedral ceiling. Installing a ceiling fan on a sloped ceiling requires a few special parts, which you can find at your home improvement store. A sloped mounting bracket will connect to the electrical box and give you a flat surface from which to work, and an extension rod will lower the level of the fan so the blades will clear the ceiling.
Turn off the power to the existing fixture at the house fuse box. Set up a ladder under the fixture to provide easy access. Use a screw driver to remove the screws holding the fixture to the ceiling.
Pull the fixture down from the ceiling to expose the wiring behind it. Disconnect the wires from the fixture and the wires from the exposed electrical box behind it. Discard the fixture.
Mount your sloped ceiling bracket onto the electrical box, using the provided mounting screws. Pull the loose wires down through the open center of the bracket.
Assemble the fan unit on the floor according to the manufacturer's instructions. String the wires from the top of the fan unit up through the extension rod.
Take the fan up the ladder and position it so the top of the extension rod is near the electrical box. Connect the wires from the box to the wires from the extension rod, connecting black to black and white to white with wire nuts. Wrap electrical tape around each connection. Twist the uninsulated ground wire from the ceiling around the green ground screw in the extension rod, and tighten the screw.
Raise the base of the extension rod up to the mounting bracket, tucking the wires inside the bracket as you do. Secure it there with the provided screws.
Turn the power back on and test the fan at the wall switch.