Description: The fan blade of SF series duct axial fan adopts special twisting radian measure design, the housing of fan adopts flanging workmanship, that makes thefannoise lower and air flow larger. Excellent performance and easy to maintain. Features: Strong wind flow and low noise, excellent performance and easy to maintain,. Technical Parameters: Model Voltage(V)Power(kw)Revolution(rpm)Wind Flow(M3/h)NoisedB(A)DF/SF2.5B-4220/3800.061450180060DF/SF3B-4220/3800.121450220063DF/SF3.5B-4220/3800.181450280065DF/SF4B-4220/3800.251450450067DF/SF5B-4220/3800.351450580070DF/SF6B-4220/3800.351450850072Application: widely used for ventilation in warehouse, workshop and amusement building. It is used in the environment with no causticity air, inflammable and explosive air, the temperature of transmitted air must be below 60°C. The voltage and the materials of basing and blades could be customized. Packing: carton