1. The hand operated and power operated winnowing fans are commercially available.
2. The paddy threshed by manual beating or by pedal operated paddy thresher is cleaned by using these fans.
3. These winnowing fans consist of frame either made up of wood, angle iron, welded steel or combination of the two along with driving mechanisms namely, sprocket and chain, belt and pulleys and single or double reduction gears.
Traditional winnowing fan:
4. Base of fan is of wooden frame like iron winnowing fan and blades are made of iron sheet with curve in ride of blades. It is for winnowing purpose in remote farmers.