Ironsman Doors and Windows (Beijing) Co., Ltd. is an innovative technology enterprise.Engaged in research, development and design, design, production, processing, sales and installation, technology transfer, promotion and application of doors and Windows curtain wall maintenance systems of passive ultra-low energy consumption buildings.The "Tiersman independently developed" polyurethane doors and window curtain wall system designed by the company has complete independent intellectual property rights, has won a number of national patents and technologies, and has obtained German PHR certification and Kangju certification.