steel louvre doors factory Brief Introduction JIAHUI DOORS was established in early 90s of 20 century,We have 3 production facilities(SHANGHAI,ZHEJIANG,JIANGSU),the coverage area is around 100,000銕?the construction area reaches 120,000銕?Our company has passed ISO9001:2008 international quality management system certification,German TUV Rheinland factory certificate,Standard BS476-22, UL...