Shanghai Xunzhong Industry, trading as XZIC, manufactures hollow-metal and timber fire doorsets, fire windows and explosion-proof and cleanroom doors, running steel and timber lines across roughly a hundred thousand square metres with more than five hundred permanent staff. Its swinging fire doorsets are published as UL Listed under file numbers R39532, R39533 and R39534, evaluated to ANSI/UL 10C positive-pressure fire test criteria, with ratings from twenty to a hundred and eighty minutes. A parallel CE-route range is offered for European projects.