This folding window features upgraded structural sealing, offering excellent overall weather resistance and making it suitable for long-term outdoor use in street-facing locations, on patios, and in cultural and tourism-related outdoor architectural settings. When closed, the window sashes are secured by a multi-seal design with multiple rubber gaskets, combined with a dedicated drainage chamber and a pressure-equalizing waterproof structure, effectively preventing rainwater from flowing back in and wind and sand from infiltrating; The reinforced profiles, combined with high-strength stainless steel folding hardware tracks, provide excellent overall wind resistance, enabling the window to withstand complex outdoor environments such as strong winds, heavy rain, intense sunlight, and significant day-night temperature fluctuations. The product’s profiles are resistant to aging, fading, and corrosion, ensuring that waterproofing, wind resistance, and sealing performance remain stable even during long-term outdoor use.