60” DIAMETER ENERGY INFORMATION at High Speed Airflow Isometrically Use | Airflow Efficiency gees 78 a8 Cubic Feet Per Watts Cubic Feet Per Minute {excludes lights} | Minute Per Wait Compare: 49” to 60” ceiling fans have airflow efficiencies ranging from approximately 51 to 178 cubic feet per minute per watt at high speed. Mona-Saving Tip: Tum off fan when leaving room.