What a downrod does
A fan works best when the blades are 8 to 9 feet above the floor, with at least 7 feet as a safety minimum. In a room with a standard 8-foot ceiling, there is no room for a rod, so you use a flush-mount (hugger) fan. As the ceiling gets taller, a longer rod drops the fan into the right zone.
The formula
Use this simple calculation:
Downrod length (inches) = ceiling height (in) minus target blade height (in) minus fan body height (about 12 in)
For example, a 12-foot ceiling is 144 inches. If you want the blades at about 8.5 feet (102 inches) and the fan body is roughly 12 inches, that gives 144 minus 102 minus 12 = 30 inches. You would round to the nearest available length, in this case a 24- or 36-inch rod, and check the result.
Downrod chart
| Ceiling height | Typical downrod |
|---|---|
| 8 ft | None (flush mount) |
| 9 ft | 4 to 6 in |
| 10 ft | 12 in |
| 11 ft | 18 in |
| 12 ft | 24 in |
| 14 ft | 36 to 48 in |
| 16 ft | 48 to 60 in |
| 18 ft and up | 60 in or longer |
These are approximate. Fans differ in body height, and some tall-ceiling fans include longer rods. Always check the fan's manual for the maximum downrod length it supports.
Use the rod made for your fan
Downrods differ in diameter (commonly 3/4 inch or 1 inch), thread and hole positions. A rod from another fan can look right and still not fit or hold safely. Use the manufacturer's rod, or one that is listed for that fan. Wiring passes through the rod, so a rod that is too narrow can pinch the wires.
Sloped ceilings
On a slope, measure the height from the floor to the point where the fan will mount, not to the low side. You may need a longer rod and a sloped-ceiling adapter so the blades clear the slope. See vaulted ceiling fan installation.
Wobble and long downrods
Very long downrods make small imbalances more visible. Tighten set screws, use a rod with a proper coupling and make sure the ceiling box or bracket is secure. See our wobble guide and the page on fan-rated box upgrades.
Frequently asked questions
Can I use a longer downrod than the one included with my fan?
Often yes, if the rod is compatible with the fan. Check the manual for the maximum length and use a matching rod.
What if my ceiling is 9 feet?
Most 9-foot ceilings work with a 4- to 6-inch rod or the standard rod that comes with the fan.
How high should blades be above the floor?
At least 7 feet, with 8 to 9 feet ideal.
Keep reading
Ceiling Fan Size Guide: What Blade Span Fits Your Room?
What size ceiling fan do you need? A room-by-room guide to blade span, mounting height, clearances and when to use two fans, from Gilbert, AZ fan installers.
Why Your Ceiling Fan Wobbles and How to Fix It
Why does a ceiling fan wobble? Check loose screws, blade balance, downrod and the ceiling box. Step-by-step fixes and when to call a pro in Gilbert, AZ.