This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give related and relevant information about the amount of air in a defined area, and the size ceiling fan required to move it in a given amount of time. If the fan you are targeting is rated or measured in capacity for a room size in square feet rather than cubic feet, this is probably a reasonably good measurement tool. For air handler fans, see our Virtual Airflow Calculator. For ceiling and crawl space vent fan calculations, see our Attic Fan Ventilation Calculator.) Enter the area dimensions in feet. Accuracy to the inch is not needed. Enter the number of times per hour that you would like total change of the air mass volume in that area. Enter the air flow coverage specification of the fan you anticipate using in square feet or in cubic feet per minute. (A general rule of thumb is to choose a fan with 26 to 36 inch blades for a room up to 75 square feet, a fan with 36 to 42 inch blades for a room from 76 to 144 square feet, a fan with 44 inch blades for a room from 144 to 225 square feet, or a fan with 50 to 54 inch blades for a room over 225 square feet, using multiples if needed. Also choose a fan with standard mounts for typical 8 foot ceilings, a fan with extended mounts for 9 to 20 foot ceilings, or a fan with flush mounts for ceilings under 8 feet. Make certain you have head clearance!) Click on Calculate and the results will be the (air) volume of the area, the amount of time for each volume of air mass change, the total volume of air requiring movement with an hour, the volume air flow of the suggested air handler or fan (based on your entries) and the number of fans or air handlers needed if they are of the target size you selected. Note that there are 2 different values returned for number of fans required; one is for a cubic foot rating and one is for a square foot rating. CAUTION: Accuracy of the cubic foot rating and air volume movement is questionable on ceiling heights greater than 12 feet due to the generally low RPM of these types of fans, and the loss of air movement at the edges of the open blades. You may click on Clear Values and start over or change any individual value and recalculate. A guideline for clear air (especially if filtered) in an area is 4 to 8 complete cycles every hour. We have entered some default values but you may change anything you like. All entries are numeric and each data entry field should have an entry, even if it is zero (0).
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