This window opening method allows the window to be fully opened, providing the maximum ventilation area. When closed, it can improve sealing by pressing the window frame, resulting in good sound insulation, dust prevention, and thermal insulation performance. Casement windows are usually equipped with complex hardware that can be locked at multiple points, which not only enhances the window's anti-theft performance but also improves safety during use. Due to its excellent sealing and safety, casement windows are suitable for various residential and commercial buildings, especially in areas that require good sound insulation and thermal insulation effects.