1. Model SWF-1 mixed flow ventilator is a novel fan, it combines the advantages of axial -flow fan and centrifugal fan. It has higher wind pressure, larger flow than other same type fan. It has the advantages such as wide and effective operational zone, high efficiency etc. 2. This fan is widely used for the ventilation and exhaust system in the office building, hotel and other civil purpose building. it also can be used to replace the low -pressure centrifugal fan or high pressure axial flow fan with no need to install large amounts of noise blanking facilities in freezing house, textile factory field.