?stberg is one of the world leading developers and manufactures of centrifugal in-line duct fans.our factory was set up in kunshan in 2004,occupies 4500sqm for phase one and we reserve another 4000sqm land for phase two as our future expansion.<br>we are producing and selling in line duct fan,with external rotor motor inside the fan,which gives high static pressure and very low noise.our purpose of setting up ourselves here in china is to supply our quality fans to the customers in mainland china and progressively export to neighboring areas and up to the whole globe.