Profile: Shanghai Denair Compressor Co., Ltd. provides double screw air compressors, root blowers, axial flow fans, vacuum pumps, portable air compressors, and oil free air compressors. Our belt screw air compressor comprises of rotors, control panels, oil filters, coolers, motors, and acoustic enclosures. Rotors are asymmetric in profile, backed up by ball bearings and roller bearings. Helical gears can produce axial force to kill some acting force, which reduces the load of the bearing of air end.