3I company has accumulated more than 30 years'experience in research and development, design and production of doors and windows based on the Hong Kong market. We are committed to the deep design of folding doors. R&D, pioneering to provide a suitable coastal and inland high-rise building folding door solutions, to solve the long-standing aluminum alloy folding door resistance Wind pressure performance constraints can not be used in coastal typhoon areas and high-rise building pain points, such a new structural system solution for the whole Folding market has opened up a brand new and broad market, which has changed the new direction of development in this field. The whole 3I door and window system passes through The Hong Kong Testing Centre conducts rigorous performance testing to ensure that high-quality door and window system products are delivered to customers.