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Aluminium Accordion Sliding Bi Fold Balcony Glazing Folding Invisible Frameless Double Glass Window With Thermal Break on China WDMA bifold Champagne Or You Want StyleTopwindow Aluminium Accordion Sliding Bi Fold Balcony Glazing Folding Invisible Frameless Double Glass Window With Thermal Break OEM&ODM Manufacturer&Desginer Structural features: 1. Adopt double guarded design, to increase the wind resistance index. 2. Use the open wood technology for splicing frame, and use imported waterproof glue before splicing, the colloid is fully extruded when we fasten screw, so the waterproof problem is solved. 3. Profile