Dynamic The dynamic classifier works by utilizing the aerodynamic forces combined with particle and air stream interaction from the spinning rotor to create separation of the large particles from the small particles. The smaller particles will pass through the rotor and out of the mill, while the large particles are rejected by the rotor which then return to the grinding zone for further size reduction. The combination of airflow and rotor speed determines the product distribution, with a typical fineness range of 65-90% @ 200 mesh. › Locate a Salesperson