GCS 2500DF (Dual Feed) Direct Drive Pulverizing Mill Unit. MODULAR SUPERSTRUCTURE FRAME is constructed of 4” x 6”, 4” x 4” and 3” x 3” tube. Incorporating tap plates and blocks for mounted components with Metric fasteners. Classifier and Cyclone Work Platforms provide access to level related components. The box type design contains machine components for future processing enhancements.