This represents advanced aluminum casement windows with integrated thermal break technology. These custom casement windows feature aluminum frames with a thermal barrier between interior and exterior sections to minimize heat transfer across seasons. As a leading aluminum casement window manufacturer, DERCHI produces windows suitable for residential and commercial projects. The S9 Series offers various exterior profiles to complement different architectural designs. The casement window hardware ensures smooth operation and long-term performance. From single window replacements to large-scale developments, DERCHI provides solutions for diverse project needs.