Shanghai Hongheyuan Architectural Decoration Design Engineering Co., Ltd. Is a company in Shanghai specializing in the installation and sales of pitched roof skylights and supporting products, with more than 10 years of development experience in the field of roof window design and installation, sales of Velux series windows, classified according to the opening method: Manual middle-hung window, manual above-hung window, manual multi-function window, electric intelligent middle-hung window with rain induction, electric intelligent above-hung window (European, Sun American), intelligent window (American-European) VMS modular intelligent skylight.