Estimated Yearly Energy Cost Cost Range of Similar Models (19° 847) «Based on 1 conks per Kh and 6.4 hours use per day = Your cost depends on rates and use + Energy Use 18 Walls All estimates based on typical use. excluding lights Airflow 3857 Cutie Fel Per Minute «The higher the airflow the more ai the fan will move = Airflow Efficiency.