Large folding doors characteristic; Standard import hardware accessories Track design under the double waterproof tape, durable, fully sealed; Outside, open dual-use larger spaces; Applicable to large and small balcony door, restaurant doors, interior partitions, and so on. Features; box fan 45 cut corner, can enjoy hit corner or activities corner yards, bottom sliding system bearing 180KG, used car level of ternary b c sealed rubber article, Xia rail design double waterproof rubber article and drainage system, used, pressure, decompression cavity sealed drainage; spot for households both inside and outside integration of home space and design, flexible extended activities space; doors opened width free regulation, makes whole fan door folding Shi Shun sliding, light Yat, no noise, unimpeded, vision open, unlimited scenery moments experience; hoist is light, Comfort in sliding doors and Windows.