As an expert in air systems, Greentech International (Zhangqiu) Co., Ltd. has become one of most successful suppliers of blower and vacuum pump in China with more than 20 years experience in R&D and marketing. Our products range from Roots Blowers (also call PD blower), Side Channel Blowers (also call ring blower or regenerative blower), Vacuum Pumps (liquid ring vacuum pump, also call water ring vacuum pump), Multistage Centrifugal Blowers, Single Stage High Speed Centrifugal Blowers, Centr