This penetration type drying machine suitable for the products can be stack together, capacity is from 300 to 10 tons. It use patented half vacuum air duct design, the products can be dried evenly even the products are stacked together. It only uses 25% of the electricity of a traditional dryer, which is very energy efficient. Adjustable temperature from 18-80℃, with hot dry, cool dry an dehumidification functions.