... ,air permeability performance,Good watertightness performance,heat rsistant property.simple and convenient operation,occupying small space,elegant ... 3.Chambers: 3,4,5,6,,excellent heat-insulating effect and airtightness. 4.Profile thickness:Thickness of main ... styleProduct FeatureEnergy saving and Ecofriendly; Sound and Heat insulation; Good air and Water proof; Anti-aging and Easy maintainance.PVC ...