About this item Energy-Efficient Ventilation: This powerful blower with a fan speed of 2550 RPM can create an air flow of 200 CFM; It combines the features and benefits of axial and centrifugal fan, effectively circulating air. Low noise and speed control: Durable plastic fan housing, revolving Smoothly and powerfully blades for less than 30 dB noise. With a variable speed controller, you can adjust it to desired airflow level according to your requirement. Easy installation: removable duct ends with locking tabs for quick removal and easy maintenance. Universal mounting bracket for direction of airflow indicating. 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 Note: max ambient temp is 104℉/40℃. Widely Applications: Suitable for industrial, household and horticulture ventilation applications; It can quietly and efficiently moving large volumes of air throughout your ventilation system.