Dongcheng's aluminum alloy folding windows are constructed from multiple independent sash panels connected by specialist anti-corrosion hinges, capable of folding to one or both sides of the opening to achieve up to 100% clear aperture. The result is an unobstructed panoramic opening that maximizes natural light ingress and ventilation throughput in a way no sliding or casement window can match.
When folded, panels stack compactly without encroaching on adjacent wall or floor space, and the flush sealing strip design ensures the perimeter gasket maintains continuous contact around the full sash perimeter when closed — delivering wind, water, and acoustic performance equivalent to conventional fixed-panel systems. This window type is the premium choice for balconies, terraces, commercial shopfronts, and any architectural application that benefits from a transformable boundary between interior and exterior.
About Dongcheng
Located in the High-tech Industrial Park of Wuxing District, Huzhou, Zhejiang, China, Zhejiang Dongcheng Energy Saving Technology Co., Ltd. is a professional manufacturer specializing in aluminum energy-efficient doors and windows, fire-rated doors and windows, curtain wall systems, railings, shading systems, and skylights. Integrating R&D, design, production, installation, and after-sales service, we provide complete solutions for a wide range of building applications.
With advanced production equipment, a well-established management system, and an experienced professional team, we are committed to delivering reliable products and consistent quality. Operating in accordance with the ISO9000 quality management system, we implement standardized control throughout the production process to ensure that our products meet relevant standards and project requirements.
Driven by technology and innovation, we continuously improve our products and services to better serve the market. We also place great importance on safety management, maintaining strict supervision throughout project execution to ensure safe, stable, and reliable delivery.
Guided by the principles of integrity, quality, and service, we are committed to providing cost-effective products and dependable support, and we look forward to building long-term partnerships with customers worldwide.
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