Large-scale Ross ribbon blenders built up to 1,000 cubic feet of working capacity are ideal for high-volume production of powder blends, pastes and slurries. These versatile blenders can also function as vacuum dryers and are engineered for fast mixing, convenient discharge, easy cleaning and low maintenance. The 385-cubic-foot ribbon blender is driven by a 75 horsepower inverter-duty gear motor. It is equipped with a double ribbon agitator designed for center discharge through a pneumatically operated dust-tight knife gate valve. Stuffing boxes are packed with braided Kevlar packing and include lantern rings for air purge when handling fine powders or abrasive materials. The two-piece cover features safety switches to prevent operation of the agitator when the cover is open.