GREFET GCW3500 is a next-generation aluminium curtain wall system focused on achieving sleek façades with high structural performance. At just 35mm sightline it increases glass area, daylight and design modernity. Engineered for durability, it provides 80mm and120mm mullion depths ideal for mid-rise and high-rise applications. GCW 3500 - designed for aluminium façade systems for commercial buildings provides an optimal energy efficiency, wind load and stability. It’s a performance curtain wall system for the architect who wants elegant design with dependable engineering.