The performance indicators of air-tightness, water-tightness and so on have gone beyond the advanced international level Functional features:  Superior performance. The performance indicators of air-tightness, water-tightness and so on have gone beyond the advanced world standard; Integrated applications of shading, decoration (grilles), ventilation and other functions; Diversity and individuality of products, as well as the matching designs with different buildings; Application of many patented technologies and new energy-saving technology, significant energy-saving effect; Orderly procedures of procurement, design, production and installation, scientific and strict quality control system.

side-hung window