Fan Size

Follow these ceiling fan size guidelines for the right proportions.

Small rooms less than 8 x 8 feet – 30-inch diameter fan or smaller

9 x 9 feet to 12 x 12 feet – 41-inch to 50-inch diameter fan

12 x 12 feet and 16 x 16 feet – 51-inch to 60-inch diameter fan

More than 16 x 16 feet – 61-inch to 70-inch diameter fan

Your room may need two smaller ceiling fans instead of one big fixture. The ceiling fan’s effectiveness can only be felt if you’re standing directly under it or less than two feet outside the fan’s radius.

This drop in airflow means that a rectangular room with a fan in the middle will leave large sections of the room untouched by any breeze. A better alternative would be two ceiling fans, each one sized for half the room. This is especially true of houses with open floor plans, which may leave one room in view of a fan without enjoying any of its benefits.

A well-sized ceiling fan also requires the proper mounting system. Choosing a fan with the proper diameter is most of the battle, but a fan can still feel overpowering if it hangs too close to your head. The optimum height for best airflow is eight or nine feet from the floor.

Ceiling Height

In most cases, a standard mount (3 to 5 inch downrod) is perfect, but you may need a flush mount for more clearance if you’re including an optional light. Ceilings higher than 8 feet require an extended mount to lower the fan to its optimum height. Use a sloped mount for angled or vaulted ceilings.

Be sure there is at least 7 feet of clearance under your ceiling fan blades. The standard 3.5? – 6? downrod should work in most 8 ft. ceiling installations. This will position the blades far enough from the ceiling to have enough “supply” air above the blades to provide good air movement. If greater floor to fan clearance is needed, some fans can use a low ceiling adapter without using a downrod. However, air movement is reduced using the low ceiling adapter.