These Gravity Separators offer many advantages over competing products - a rectangular deck for greater separation efficiency and accuracy. The lighter particles move the entire length of the deck, producing the cleanest light and heavy product fractions available.The patented multiple fan system is individually adjustable, giving the necessary control through different air settings to accomplish the accurate weighing necessary.This unique and proven multiple fan system is only available on Oliver and Fowler Oliver Machines.The Fowler Oliver Gravity Separator is the most flexible, reliable and versatile machine on the world market, and is designed for wheat, coffee, seeds, spices, sesame,groundnut and other products.