If you have a sloped ceiling, you can still install a ceiling fan. You will just need to make sure that you get a special mount that is made for sloped ceilings. You may also need to get a longer downrod to accommodate the slope of the ceiling. If you are not sure whether or not your particular ceiling fan will work with a sloped ceiling, you can always check the manufacturer's website or give them a call. They should be able to help you out and give you all of the information that you need.