Chinalco Mingjiang doors and windows are of national standard. According to the query of relevant information, Chinalco Mingjiang Doors and Windows is a metal material trademark that has been applied for with a purely Chinese structure and has been approved by the relevant country, so it is a national standard. "Chinalco Mingjiang" system aluminum doors and windows originate from the Guangdong brand, and Fangcheng Doors and Windows Co., Ltd. is the authorized designated general distributor in Central China.