VIVOSUN 4 Inch 190 CFM Inline Duct Ventilation Fan with Variable Speed Controller for Grow Tent EFFECTIVE VENTILATION: Powerful blower with a fan speed of 2300 RPM for an air flow of 190 CFM. Moves air through your target location efficiently for optimal ventilation LOW NOISE LEVEL: Durable plastic fan housing and blades for extremely low noise(&lt;31 dB); Variable speed controller for easy fan speed adjustment. EASY INSTALLATION: Removable duct ends with locking tabs for quick removal and easy maintenance and a cord length of 5.9 feet for hassle free setup. VERSATILE APPLICATIONS: Suitable for industrial, household and horticulture ventilation applications for air clean and temperature control. NOTE: Comes with an installation bracket indicating the direction of the airflow. Max Ambient Temp is 104 / 40 Diameter: 4 inch Power Supply: 110/120 V Power: 59 W Current:  0.8 A Speed: 2300 RPM Air Flow: 190 CFM Noise Level &lt;31 dB Max Ambient Temp is 110 / 45.