A herniated disk, sometimes (incorrectly) called a slipped disk, is a common cause of severe back pain and sciatica. A disk in the lumbar area becomes herniated when it ruptures or thins out, and degenerates to the point that the gel within the disk (the nucleus pulposus) pushes outward.
The ceiling fan's downrod must be long enough for the fan's blades to clear the ceiling. A fan with a 12-inch downrod works for a vaulted ceiling with a one-quarter-to one-third-inch pitch. An 18-inch downrod is sufficient for a pitch that is five-twelfths to one-half inch.
Step 2. For a downrod installation, insert the downrod into the collar yoke on the fan motor and secure it to the motor assembly as the manufacturer instructs. For a flush-mount installation, attach the top housing, trim ring (if applicable) and canopy to the fan motor assembly.he ceiling fan you install should be the right size for the room: 1  Rooms that measure about 75 square feet need a fan with a 29- to 36-inch blade diameter.