Qingdao Zhihongda Machinery CO.,LTD is located in the west coast of Qingdao city, Shandong Province. China.We have been specialized in manufacturing all kinds of hot air circulating ovens more than 15 years.Our experienced staffs have been working in the ovens manufacturing industry for decades, So we can guarantee that our machines will be running with good performance based on high quality. good after-sales service will be satisfied with you.Ou…