You're talking about manufacturers in Guangdong, all of which started with advertising! Thanks to the advantages of Foshan Dali Aluminum, they started with sliding doors. There is a saying that the south gate and the north window, the really good window or the north window is more harmful! In a real sense, in addition to Xu Ge system doors and windows (German brand, expensive to death), our domestic brands have a relatively high degree of standardization: Huang Qian door and window system, punctual door and window system and so on. , are excellent in the industry. They are all windows in the north, with good sound insulation, good heat insulation and good sealing, unlike the windows in the south, which are gaudy and impractical.