iPower 4 Inch 106 CFM Inline Fan Duct Exhaust Booster with Speed Controller for HVAC in Grow Tent, Basements, Bathrooms and Kitchens

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 4 inches, speed of 2990 RPM and 106 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.