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1.Sound capacity of wind-load resistance：The relationship between sash and window frame makes the force of the wind apply to the entire window instead of only the hardware. It improves the wind concealment significantly of the windows.

2.Double-Rail Roller Carriage：The design of double-rails roller carriage is to prevent digression under strong wind load, and to ensure the sealing tightness within the range of shift 7mm.

3.Perfect sealed system：Double sealed sash creates a perfectly sealed window. The hardware system links all the window parts with one another, thus becoming a perfectly protective shield against strong wind. Gives you close to a seamless experience.

4.The perfect sealed system：The distance of 7mm shifting presses the sash to the frame, achieving sealing effect by the pressed gaskets between sash and frame. The 4 sides locking system ensures high quality of sound insulation, water and air tightness.

5.Water Tightness

6.Anti-thief function：The Multi-lock points around the frame can simultaneously lock the window in place to improve the security and seal performance.

7.Stay at any Position

8.Easy Operation