The GREFET CS40 Casement System is a modern and cost-effective aluminium window and door solution designed for contemporary residential and high-rise projects. Engineered for durability, clean aesthetics, and smooth functionality, CS40 offers versatile design options suitable for both premium and volume-based developments. With slim aluminium sightlines, multiple opening configurations, and flexible locking options, the system delivers the perfect balance between performance, practicality, and value.