It is especially used in semolina factories to classify semolina and to collect the flying bran with air in semolina. It can also be used in high quality flour mills. Purifiers are mostly used for obtaining thin flour, with low ash and starch damage. The Sieves has three decks and being actuated with two vibro motors Sensitive air adjustment is possible via air adjustment clacks. Cleaning of sieves are made with brushes. Purifier is assembled on vibration preventive chocks.