Question: My ceiling is slanted at 25%, can I still install a ceiling fan?
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If your ceiling is slanted at 25%, that would be a 3:12 slope, which is about 23 degrees. If you purchase a fan from a specialty ceiling fan dealer, they will be able to supply you with an optional angled ceiling adapter that is made specifically for the fan you purchase. Most of these adapters will accomodate ceilings that are pitched up to 30 degrees (some up to 25 degrees), so you should have no problem. You will also need to purchase a matching downrod.
You will probably also need to buy a downrod as well. The downrod should bring the fan blades no lower than 7 feet from the ground. Most of the better brands of fans will have downrods available up to 6 feet long, and Casablanca Fan Company has downrods as long as 10 feet. A ceiling fan expert can help you determine the correct downrod for your ceiling based on the height of the ceiling at the point you wish to locate the fan, what will be below the fan (furnishings, bed, table etc), and how large the room is.