iPower 6 Inch Inline Booster Duct Fan with Speed Controller, 275 CFM Exhaust Fan HVAC Ventilation Duct Blower for Bathroom, Kitchen, Basement, Attic and Grow Tent Silent design: Reduce the sound output to only 28 dB-no harm or disturb for your life. Superior balanced blades and centrifugal impeller for quiet operation and long service life. Easy to adjust speed: With the variable speed controller on the power cord, you can optimize airflow and noise level for desired application. Turn the knob to control the vent fan to run at different speeds. Durable and safe: Strong motor of this duct blower is energy saving and requires no maintenance. Featuring overheating protection, the unit will automatically shut off if overheating is detected. The quality steel housing is sturdy. Easy to install: With a diameter of 6 inches, speed of 3120 RPM and 275 CFM airflow, this air exhaust fan is lightweight enough for quich removal and easy installation in areas with little available space Wide applications: A duct fan designed to boost airflow in HVAC systems, ventilate home spaces and use in grow tents as intake fans or exhaust fan. Use it in bathrooms, kitchens, workshops, basements, attics and etc. UPC 840166285213 ASIN B0CQZGPXX4 Size 6 Fan with Controller Brand iPower Color Black Speed 3120 RPM Voltage 0.92 Volts Wattage 37 watts Efficiency 7.43 cubic_feet_per_minute_per_watt Model Name with Speed Controller, 275 CFM Form Factor Tubular or Cylindrical Is Cordless No Item Weight 2.31 pounds Noise Level 30 dB Reusability [POSSIBLY] Manufacturer iPower Power Source Corded Electric Control Method Touch Air Flow Capacity 275 Cubic Feet Per Minute Item model number 6 Inch Inline Booster Duct Fan Product Dimensions 7.28 D x 6.3 W x 7.75 H Electric fan design Exhaust Fan Included Components Cord IndoorOutdoor Usage Indoor Number of Power Levels 2