How to Calculate a Ceiling Fan for a Vaulted Ceiling

A ceiling fan is an economical way to cool the occupants in a room. It is also a decorative feature that often includes a light fixture. It is not difficult to calculate the size of ceiling fan necessary for a room with a vaulted ceiling. During the warm weather seasons, you can raise your thermostat 2 degrees and save up to 14 percent on your energy bill by using a ceiling fan, as stated by the Energy Star website.

Tape measure
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Instructions

- 1
  Measure the length and width of the room where you want your ceiling fan.
- 2
  Multiply the two measurements together to calculate the square footage of the room. Generally, a room that is up to 50 square feet requires a fan blade span of 30 inches. For a room that is 51 to 100 square feet, select a span of 36 inches; up to 200 square feet, a 42-inch span; and use a 52-inch span fan blade for rooms that are 200 to 400 square feet. Any room size larger than 400 square feet requires fan blades with a span of 54 inches, according to the This Old House website.
- 3
  Look for a mount made specifically for vaulted or angled ceilings. Generally, these are called slope mounts.
- 4
  Add a downrod to the sloped mount so that the ceiling fan is positioned 8 or 9 feet above the floor. This creates optimal airflow in the room.

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