Check the listing for details. Vivosun 8" Inline Duct Fan 720CFM HVAC Exhaust Blower Variable Speed Controller. Color: Black, Condition: New. Listed at 68.24 USD. About this item Energy-Efficient Ventilation: This powerful blower with a fan speed of 2450 RPM can create an air flow of 720 CFM; It combines the features and benefits of axial and centrifugal fan, effectively circulating air Low Noise Level: The durable fan blades revolve smoothly and powerfully, which helps collect airflow volume and cut noise output; A less than 38 dB noise level will not disturb your work Adjustable Speed: A stepless speed controller on the power cord enables the fan to run at different speeds; With this speed switch, you can adjust it to the desired airflow level Easy Installation: This duct fan is compact and lightweight so it can be installed in small areas; Comes with an installation bracket indicating the direction of the airflow; Removable duct ends with locking tabs Versatile Applications: Suitable for industrial, household and horticulture ventilation applications; It can quietly and efficiently moving large volumes of air throughout your ventilation system