FMC Roto-Louvre Dryer. Model 803-33, Order # jk5992 803. Roto-Louvre Dryers are used to dry or roast products for the food, chemical or mineral industries. This Roto-Louvre Dryer was purchased new about ten years ago by a major cereal manufacturer and never installed. Their application was to dry cereal at a rate of 20 lbs/min with the incoming cereal at 20% moisture and the dried cereal at 8% moisture. Please open the attached pdf to see the Roto-Louvre Dryer Specifications. (ACN5450)