Ceiling height directly affects how far down from the ceiling a fan should hang. An area with at least an eight-foot ceiling is best, if possible. In addition, any peculiarities such as a vaulted ceiling or differing ceiling heights throughout a room must be considered when hanging a fan. Adding a six-inch downrod to fans hanging from higher ceilings gives extra length.
Ceiling fans should ideally hang nine feet from the floor to prevent injuries to people in the home. Maintain a minimum of seven feet from the bottom of the fan to the floor, suggests by Bob Vila.
A ceiling fan cannot circulate air properly if it is hung too close to the ceiling. You should hang a ceiling fan with at least as much clearance as that provided by the installation materials with which the fan came.
Some fan designs work better for low ceilings. Simplistic designs without hanging lights give maximum clearance under the fan.