Let’s use the CFM formula to see if we get the same number (this is the very formula used in the calculator): CFM = (Area x Height x ACH) / 60. If we input the figures from our example, we get: CFM = (1,000 sq ft * 8 ft * 4) / 60 min = 533 ft 3 /min = 533 CFM. In short, we get the same number.

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