Casement window is one of the most popular window installation options among consumers. Here are Doorwin's Minimalist Design Series and Architect Design Series, which has the Beautiful and Fine furniture detailing with the most authentic look. the Depth of These two design series Frame are 125mm and 163mm. which are Interior Solid Wood and Exterior Aluminum Profile, This Casement Window System could effectively resist wind pressure and distortion, and Excellent Heat-Insulation Performance. 3 Layers Sealing rubber strip Between Frame and Sash could guarantee that Air-Tightness is perfect. The Whole Window Applied Equal Pressure Cavity Drainage Design, and make sure No Water Penetration During the Strong Wind and Heavy Rain. Based on previous test report of CLEB, the U-Value was less than 0.35. Doorwin windows are made with a variety of high-performance glass options to meet your energy performance and budgetary needs, such as the warm edge spacer (world famous brand SWISSPACER ),ultimate Low-E glass, and so on, which guarantee you can get any dreamed windows. Meanwhile, we could offer wide range of special sizes, shapes and styles. That’s what we called Custom-Made.