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In order to keep fan blades between eight and ten feet from the floor, there is a recommended downrod length for every ceiling height: A 12 inch downrod is typically recommended for 9 feet ceiling heights. A 18 inch downrod is typically recommended for 10 feet ceiling heights. A 24 inch downrod is typically recommended for 11 feet ceiling heights. A 36 inch downrod is typically recommended for 12 feet ceiling heights. A 48 inch downrod is typically recommended for 13 feet ceiling heights. A 60 inch downrod is typically recommended for 14 feet ceiling heights. A 72 inch downrod is typically recommended for 15 feet ceiling heights.