Zowor (中沃门业, trading internationally as Henan Zhongwo Fire Science and Technology) manufactures steel and timber fire doorsets, fire windows and fire shutters from two plants in Henan with around four hundred staff. It is one of the few Chinese fire-door makers to publish a full certificate register rather than unattributed logos: Intertek is named as the certifying laboratory for its British Standard route doors under certificates 200821001SHF-002-R1 and 200330021SHF-001-R1, and it holds UL certification under file R40144. Domestic production is separately held under CCCF 3C certification to GB 12955, with model codes and certificate numbers listed alongside.