ENERGY INFORMATION at High Speed Airflow Electricity Use Airflow Efficiency 5571.0 66.1 84.0 Cubic Feet Per Watts Cubic Ft Per Minute (excludes lights) Minute Per Watt Compare 49” to 607 ceiling fans have airflow efficiencies ranging from approximately 51 to 176 cubic feet per minute per watt at high speed. Money-Saving Tip: Turn off fan when leaving room.