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 air handler or fan required to move it in a given amount of time. The air movement can be from a heater, AC unit, chiller, refrigeration unit, closed fan unit or cooler (swamp cooler or evaporative cooler) into the area, or from an exhaust fan moving the air out of the area. (This should not be considered for open fan blade fans in ceilings higher than 12 feet. 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 not a good measurement tool. For open blade fans, see our Ceiling Fan 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 specification of the air handler (fan) you anticipate using in cubic feet per minute (CFM). 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. 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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