Changzhou Ouna  drying equipment Co., Ltd. of the hot air circulation oven through the air circulation system using the wind turbine circulating way, uniform and efficient wind circulation. Fengyuan by cyclic send wind motor (adopts contactless switch) drives the wind wheel through a heater, and the hot air sent, again through the air duct to an oven chamber, the use of air intake duct become air re circulation and used for heating.