We are the professional producer of exhaust fans. The shutter utilizes its automatic controlling equipments to let shutter blade automatically open and close, thus it can reach the purpose of dustproofwaterproof and effect of perfect. The series of fans have low noise, big wind volume, low consumption of electricity, good cooling effect and so on. It can be used in the workshops of the factory for lognitudinal and transverse ventilation. This is the best cooling equipment in the factory workshop of the times. The quality of the product can reach the international standard. Characteristics of Sanhe Fan: 1) The fan adopts stainless steel fanleaf , big air volume, without deformation, no breaking, attractive and durable.(Before adopted aluminum fanleaf, and also had some problems in factory cooling, for example breaking and small air volume) 2) Adopted automatic belt up and tight so that dont pine belt and drop belt,(Dealers warranties the fan two years for the users, so that the users only use and dont maintenance. Another the belt will become long after used one month, and will pine and drop belt, so that damaged to the fan and the dealers. 3) The strap wheel adopts more stiffening rib and processed by sandblasting, become attractive, eliminate the internal stress and increase own emphasis efficiently; France imported axletree, high intensity, low noise, long service life. 4) Variety size of shape and install conveniently. Size of shape: 780mm*780mm*420mm830mm*830mm*400mm900mm*900mm*400mm1100mm*1100mm*400mm1220mm*1220mm*400mm1380mm*1380mm*400mm1530mm*1530mm*400mm seven kinds. 5) We can manufacture A type strap or B type strap according to the sale of dealer, and satisfy different needs of customers.