ENERGY INFORMATION at High Speed Airflow Electricity Use | Airflow Efficiency 5656.70 | 17.00 332.75 Cubic Feet Per Watts Cubic Feet Per Minute {excludes lights) | Minute Por Watt Compare: 49" to 80" ceiling fans have airflow efficiencies raging from approximately 51 to 176 cubic feet per minute per watt at high sped. Money-Saving Tip: Tum off fan when leaving room.