Combo® Screen Units KPI-JCI Combo® screens are available in 6x20, 7x20 and 8x20 sizes.  Two multi-angle and a horizontal bottom deck increase material travel speed in the feed section, decreasing depth of bed material.  Material moves through screen cloth or urethane openings quicker.  This triple shaft, non-plugging oval motion screen is ideal for both scalping and product sizing applications.