Gusu Purifying is the leading provider in cleanroom system solution industry, the drafting unit of national standard “Code for construction and acceptance of cleanroom”and “Architectural technical code for hospital clean operating department”,the National secondary qualification enterprise of Air purification project, Electronic and intelligent engineering, Building electrical and mechanical installation engineering, and Building decoration engineering; Hi-tech Enterprise of Jiangsu province; passed ISO9001 International Quality Management System Certification and ISO14001 International Environmental Management System Certification, OHSAS 18001 International Occupational Health and Safety Management System Certification.