Zhongjun Tean (中君特安（承德）消防技术有限公司) is a wholly owned subsidiary of Beijing Ruitefuan Technology, which has developed water-based extinguishing agents since 2005. From the Chengde County High-Tech Industrial Park it runs a 10,000-tonne water-based agent line and four filling lines for water-based extinguishers. Its products include portable, wheeled and hanging extinguishers, agents for forest fires and low temperatures, and drone-delivered firefighting. Its extinguishers and agents hold fire product certifications 2025291810000476, 2026291810000150 and 5982026ZY110044 from the Tianjin Fire Research Institute of the Ministry of Emergency Management.