Zhejiang Shangjian Fan (浙江上建风机有限公司), formerly Shangyu Construction Fan Factory, dates from the 1990s. It manufactures fans and air-control equipment in Shangyu, Shaoxing. Its products include fire smoke exhaust fans, roof fans and special-purpose fans, as well as valves, air outlets and fittings. The fans serve civil buildings, warehouses, industrial plants, urban rail transit and municipal facilities. It runs a CNAS-accredited aerodynamic performance laboratory. Its centrifugal smoke exhaust fans and smoke exhaust valves hold fire product certifications 5982022ZY060040 and 5982026ZY060049 from the Tianjin Fire Research Institute of the Ministry of Emergency Management.