... time, 2, materials save 3, longer using life. Specification: Curtain wall: Refers to the supporting structure system and composition of glass, ... buildings. Advantage of Curtain walls:1. waterproof,2. airtight,3, temperature control,4, sound insulation, 5, the ability to resist ... by order quantity20ft200pcs for wPerformanceindow with normal size(1.2mx1.2m)90pcs for Doors with normal size(1.8mx2.2m) ...