# How to Calculate the CFM of a Blower

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Many industrial processes require continuous aeration. Sewage treatment, for instance, uses aerobic microbes that respire constantly as they break down sludge. An industrial blower provides the necessary oxygen by maintaining a steady flow of air into the reaction chamber. You can estimate a blower's volumetric flow rate from the reactants' oxygen absorption rate. The other relevant factors are temperature and the pressure of air at the blower's discharge point.

• Add 460 to the temperature at the discharge point, measured in degrees Fahrenheit, to convert it to degrees Rankine. If, for instance, air leaves the blower at 80 degrees: 80 + 460 = 540 degrees Rankine.

• Multiply the Rankine temperature by the number of pounds-moles of oxygen that is transferred each minute. If, for instance, 8 pounds-moles of oxygen reach the reactants each minute: 540 x 8 = 4,320.

• Multiply this product by 10.73, which is the gas constant: 4,320 x 10.73 = 46,354.

• Divide the result by the pressure at the gas discharge point, measured in pounds per square inch. If this pressure, for instance, measures 15 pounds per square inch: 46,354 / 15 = approximately 3,090. This answer is the blower's volumetric flow rate, measured in cubic feet per minute.

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