This group includes Single Inlet Centrifugal Fans (Sheet Metal Case), Single Inlet Centrifugal Fans (Aluminum Case), Medium Pressure Single Inlet Centrifugal Fans, Industrial Centrifugal Fans, Pellet and Boiler Fans, Double Inlet Belt Driven Centrifugal Fans, Medium Pressure Industrial Centrifugal Fan, High Pressure Industrial Centrifugal Fan, Low Pressure Industrial Centrifugal Fan. It is a ventilation fan model classified according to wing shapes. Air is sucked from one or both sides of the centrifugal fan impeller and pressed at an angle perpendicular to the fan shaft. Centrifugal fan blades are surrounded by a shield called a snail or body. The air pressed from the propeller is thrown out by passing through the outlet of the snail.