Greentech International (Zhangqiu) Co., Ltd. is a professional manufacturer of Roots blowers with 15 years of manufacturing experience. The company has invested more than 50 million yuan. It is a comprehensive enterprise integrating scientific research, manufacturing and trade. The company is located in Zhangqiu District, Jinan City, a famous mechanical processing township in Shandong Province. The company's GTSR series three-leaf Roots blower and Roots vacuum pump is a new high-efficiency Roots fan independently developed on the basis of extensive absorption of advanced technology at home and abroad, and has two patents for Roots fans, which has achieved obvious results in noise reduction and energy saving. In the production process, the company adopts advanced CNC machining centers, CNC gantry planers and other high-precision equipment to ensure the stability and reliability of product quality and be recognized by Everbright customers at home and abroad.