Spider Farmer Grow Kits-6 Inch Inline Fan Air Carbon Filter 33 Feet Ducting Ventilation ComboPOWERFUL INLINE FANMixed flow design combined with an EC motor ensures truly energy efficiency, with only 50 watts of power but gives a strong airflow up to 350 CFM, very low noise level, only produces 32DB, this 6 duct fan is silent. Lightweight and balanced ABS blades reduce the airflow resistance, add airflow by 40%. The speed controller comes with a long wire length of up to 8. 2 ft which can place it out of the tent for easier control. ETL FCC