These casement windows feature an upgraded structural sealing design, offering excellent all-weather performance and suitability for long-term outdoor use. The window sashes utilize a multi-layer sealing gasket compression process, combined with a dedicated drainage chamber and a pressure-equalizing waterproof structure, to effectively prevent rainwater penetration and the ingress of wind and sand. High-quality, thickened profiles paired with high-strength hardware provide strong wind resistance, enabling the windows to withstand harsh weather conditions such as strong winds, heavy rain, intense sunlight, and frost. The product is resistant to aging, fading, moisture, and corrosion, making it suitable for a wide range of challenging environments, including coastal areas, forested regions, scenic spots, and urban buildings. It remains watertight, retains its shape, and remains draft-free even after long-term use.