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made in china garden balcony patio australian standard folding window aluminium alloy doors and windows on China WDMA bifold Step1:Customers inquary for the professionalProduct Display Product Display CONTACT US > Excellent Performance 1: sound insulation : RW>30DB 2: wind pressure Resistance: Third clsss(GB 106) 3: Air Permeation Resistance: Third class(GB 108) 4: Heat insulation Resistance: Third: 2. 8 (m2k),2. 5W (m2k),or below2. 0w (m2k) 5: water penetration: 350PA Hot Sale Hot Sale Company Overview Company Overview we can give you profession design for your project, and give you the best solution for your