ENERGY INFORMATION at High Speed Airflow Electricity Use | Airflow Efficiency 4,500 56 80 Cubic Feet Per Watts Cubic Feet Per Minute (excludes lights) | Minute Per Watt Compare: 36" to 48" ceiling fans have airflow efficiencies ranging from approximately 71 to 86 cubic feet per minute per watt at high speed Money-saving Tip: Turn off fan when leaving room.