The X1C line mechanical silent window design is based on the advantages of American outside-opening windows. Simple and beautiful – the way to meet Chinese user demands. It not only has the advantages of convenient opening, safety and better anti-mosquito performance of an American window, but also inherit the ViewMax design style. Increased in system structure intensity, sealing performance, and energy saving performance to avoid the traditional American window and door structure defect of low structure intensity, which provided the latest outside opening solution for ViewMax. This line has been developed in a mechanical version and an electric version.