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bifold patio doors new arrival folding door from China manufacturer on China WDMA exterior there are more than 300Product Description Compared with ordinary doors, aluminum bi fold doors are more convenient and safe to use. It is one of the best choice of doors and windows for many families . Moreover, the aluminum bi fold door is more beautiful in design. So aluminum bi fold door, which is safe, convenient and beautiful, is very popular. Advantage 1. Folding design makes the opening space to the maximum extent ,and can fully see the outdoor landscape ,making the