ENERGY GUIDE Estimated Airflow Yearly Energy Cost 2 581 Cubic Feet Per Minute + The higher the airflow, the S . $ more air the fan will move 3 34 ยข Airflow Efficiency 80 Cubic Cost Range of Similar Models (19"~ 84') Feet Per Minute Per Watt e-Hased on 12 cents per kWh and 6.