The circular sieve is fitted in the top position to take off the large impurities. The oblong bottom sieve has a smaller perforation allowing weed seeds and broken grains to fall though it to the delivery chute for collection to a reject receptacle. The cleaned separated grain passes downward over the bottom sieve and discharge on the opposite side of the machine into product receptacle. A Paddle wheel centrifugal fan was adopted for the machine which has advantage of creating a higher pressure. The fan housing was made from iron sheet cut into a scroll like shape and a 36 cm x 180 cm folded into desired shape was weld on it. Six blades of 32 cm by 16 cm iron sheet were fastened on the fan shaft through solid metal supports. An inexpensive easy -to- built fan housing opens into the sieve assembly through a 36 cm x 18 cm rectangular duct