Matching the fan to the room
A ceiling fan that is too small barely moves the air; one that is too large can feel like a draft. The blade span, measured tip to tip, should match the floor area:
| Room area | Blade span | Example rooms |
|---|---|---|
| up to 75 sq ft | 29 to 36 in | bathroom, laundry, walk-in closet |
| 76 to 144 sq ft | 36 to 42 in | small bedroom, office |
| 144 to 225 sq ft | 44 to 50 in | bedroom, kitchen, dining room |
| 225 to 400 sq ft | 50 to 54 in | large bedroom, living room |
| over 400 sq ft | 56 in and up, or two fans | great room, open-plan space |
Mounting height
For the best airflow, blades should sit about 8 to 9 feet above the floor, and never lower than 7 feet. The downrod sets that height:
| Ceiling height | Downrod |
|---|---|
| under 8 ft | flush mount (hugger fan) |
| 8 ft | standard mount, no extension |
| 9 ft | about 6 in |
| 10 ft | about 12 in |
| 12 ft | about 24 in |
| 14 ft | about 36 in |
Worked example
A 14 × 12 ft bedroom with a 9-foot ceiling:
- Area: 14 × 12 = 168 sq ft.
- Blade span: 44 to 50 inches; one fan is enough.
- Downrod: about 6 inches.
- To keep the blades 7 ft above the floor, the fan can hang down at most 24 inches from the ceiling.
Other things to check
- Sloped ceilings: use an angled mounting kit and a longer downrod so the blades clear the slope.
- Clearance: keep the blade tips at least 18 inches from walls and sloped ceilings.
- Support: the electrical box must be rated for fan support; a light-fixture box is not enough.
- Efficiency: compare the airflow efficiency on the EnergyGuide label, in cubic feet per minute per watt. DC motors use much less power than older AC motors.
- Damp locations: porches and bathrooms need fans rated for damp or wet locations.
Summer and winter
In summer, run the fan counterclockwise (seen from below) to push air down; the breeze lets you raise the thermostat by about 4 °F with the same comfort. In winter, switch to clockwise at low speed to bring warm air down from the ceiling without a draft. Turn fans off when you leave the room, since they cool people, not air.