Zhejiang Mingxin Energy Saving Technology (浙江明新节能科技有限公司) is the building-fan business of the Zhejiang Mingxin Fan group in Shangyu, Shaoxing. It makes centrifugal and axial smoke exhaust fans, high-temperature smoke exhaust fans, mixed-flow fans, smoke exhaust valves, fire dampers and multi-leaf control dampers. Its smoke exhaust valves hold fire product certifications 5982026ZY060126 and 5982026ZY060124, and its normally-closed air supply valves hold 5982026ZY060128, all from the Tianjin Fire Research Institute of the Ministry of Emergency Management.