Drying is one of the crucial steps in food processing and preservation. It is the means of providing grain at optimum moisture content for processing, such as rice milling and wheat milling processes, as well as rendering grain moisture content at stage where moisture is unavailable for mould growth. In preserving grain without deterioration, drying is the cheapest among other methods, ie, chemical application and controlled atmosphere storage. Drying methods and operation are rather specific for each kind of grain and its use. Skilled operators are often required for the drying operation.