SWF series spiral fan has entertained, centrifugal fan, air is higher than high wind axial flow fan, can install axial etc, on the basis of series in CDH flow optimization products, customers give low noise, power saving and efficient use of a wide area, installation convenience centrifugal fan, reliable operation, etc. FEATURES 1、High Efficiency,Wind Range:The fan is a hi-tech product developed by CAD software system Its air pressure is higher than of axial-flow rate is larger than of centyifugal fan. 2、Compact in structure,Convenient in installation,Relisble operation:Under the condition of asme air flow,air pressure,volume of the fan is amaller than that of both axial--flow fan and centrifugal fan.The fan can be directly connected with round air dut and can be mounted in the wall or on the support,also can be directly driven by motor. 3、Low Noise:Using Special desigined casing greatly reduces turbulent flow noise.Under condition of certain airflow,air pressure,noise reduces2-3dB(A).Meanvjile you can get higher air pressure under low fan speed.There for it can replace low-pressure centrifugal fan,high-pressure axial-flow fan in industrial enterprise,civil buildibngs without any noise limination. 4、Suitable for use with large scope to meet various pr\urposw,the fan is made in single or dual speed,adjustable blade angle,changeable blade numbers and speed.