Centrifugal Fans are SWSI, Class I, Arrangement 9 and 10 general purpose air moving devices. They are used for supply or exhaust applications in commercial, institutional and industrial HVAC systems. At the heart of the Dynamo is a computer-designed, backward inclined, centrifugal wheel. This heavy duty non-overloading aluminum wheel assures low noise and high efficiency performance.Click here for more product information: https://www.pennbarry.com/Catalog%20Home/Commercial/Commercial%20Centri…