Shanghai United Compressor Co., Ltd. ( United OSD) is one of the most famous professional screw air compressor manufacturers in China. All products of United OSD are fully in accordance with ISO 9001 international standard as well as conform to ISO 14001 environmental requirements. United OSD produce the screw air compressor from 20HP to 600HP (15KW-450KW). The FAD (flow of air discharge) is from 35CFM/min to 2850CFM/min (1M3/min - 80M3/min).