... ventilation while security 4.Long serve life Europen pvc pinto at bintana1) Reasonable structure, various models, streamline profile and European groove ... thermal conductivity k< 2.0W/m2.K, soundproof can reach at least s35Bb.3) The windows and doors frames and auxiliary ... windows and doors and the products can resist the wind at least 3kpa.6) Our products are uninflammable things and have ...