Kichler Lighting 360001TZP Ceiling Fan 18IN Downrod is generally recommended to be used on ceiling fans being installed on ceilings that are 10-feet high. A general formula for calculating downrod length needed is using the ceiling height in feet minus 9-feet. This will give you a recommended downrod length you might need. This formula is based on the fan-to-floor distance of 8-feet plus 1-foot for the dimension of the fan. In rooms with a low ceiling clearance, the fan blades should not be lower than 7-feet from the floor. In this case, a Hugger or Flush Mount ceiling fan might be needed. Designed for Indoor or Outdoor use, but the outdoor finishes are powder coated with a galvanized under-coating to protect the finish from untimely wear. 360001TZP is 18-inches long and has a 1-inch outside diameter. 360001TZP comes one per package. Since 1938, Kichler has offered so much more than just distinctively beautiful lighting. We"ve also backed each style with award-winning craftsmanship, unparalleled quality and superior service. Kichler Lighting offers a distinctive array of lighting solutions that reflect your individual personality, tastes and plans. We believe that lighting should exceed functionality and transform your spaces into stunning, inspiring settings. Lighting that energizes, as well as enhances your life.