1.top10in China,2000set/year 2.three lobe 3.energy saving 4.low noise 5.used in electricity industry, cement industry, pet Product Name:PJL500 Roots BlowerDownload Product Description:The purpose of the DSR roots blower:The DSR roots blower is mostly used in dealing water, air transporting, combustion furnace, washing, vacuum packaging, electricity industry, cement industry, petrochemical, food ...