Greentech International (Zhangqiu) Co., Ltd is the professional roots blower supplier. The NSRH type clover spiral Roots blower on the basis of the manufacture and sale of a Roots blower for many years the development of new products using new technology.

The machine through the use of new lines on the impeller, the overall adiabatic efficiency and volumetric efficiency is further improved, and is excellent particularly in the fan of the air volume and pressure characteristics.

;机械零件及零件加工;机械零部件销售;通用设备制造（不含特种设备制造）;特种设备制造（不含持证专业设备制造）;电气设备销售;电气仪器仪表的销售;货物进出口;技术进出口。（除依法须经批准的项目外，凭营业执照依法独立开展经营活动）

所谓优异的效率，就是减少了风力涡轮机本身的发热量，即。温升下降，各型号在干燥状态下使用排气压力可达1kgf/cm2。