A Dupps Ring Dryer is used by a food manufacturer who once had to dispose of massive amounts of wet oat hull waste.The dryer now turns this waste into a bran meal which is milled into a fine oat bran flour.A Dupps Ring Dryer is used by a food manufacturer who once had to dispose of massive amounts of wet oat hull waste.The dryer now turns this waste into a bran meal which is milled into a fine oat bran flour.