The fan, adapted from a used truck, is connected by a V-belt to a 5-hp gasoline or diesel engine. A kerosene burner of vaporizing pot type and gravity feed is used. It has a fuel consumption of 1.5 liters*hour and takes about 8 hours to dry 1 batch of 1.7 t from 26% to 13%, moisture, using a drying air temperature of 43.