The Purifier used in grain, cereals and food processing plants in the grinding unit. The Purifier is used for the cleaning and classification of semolina in flour and semolina factories. The flow rate can be adjusted by means of a curtain, evenly distributed across the entire screen surface. Screening is carried out with 2 or 3 layers of wire. The aerodynamic air channel and the air regulating flaps create equal vacuum on all sieve surfaces, and the holding surface, such as bran and bran, is suspended from the product by being suspended in vacuum and pushed into the outlet duct. Bran-free product (semolina) sieves to sort grain size.