Home Product Grain Based Ethanol Rotary Control Sifter ROTARY CONTROL SIFTER Final Flour Sifting. Used for final sifting before flour is transferred to storage silos or bagging. Flour & Semolina Applications. Suitable for final sifting in flour and semolina mills. Compact Installation. Occupies less space within the processing line. Higher-Capacity Operation. Designed to accommodate higher sifting capacity. Low Maintenance Requirement. Described as requiring minimal maintenance.