The wall thickness of the frame and the fan is 2.0mm, exceeding the national standard, easy to meet the needs of large balcony window sealing. The structure design of the frame-wrapped fan, the window fans are completely hidden when they close, one fixed and one push of opening mode of large french window, and the light transmittance is as high as 90%. Broken bridge structure design, the glass hollow use warm edge strip, which is more heat preservation and insulation, energy saving and environmental protection. The window frame is wrapped and sealed with multi-channel sealing wool sliver and rubber strips to effectively improve the sealing and soundproof performance. Use anti-swing wheel on upper rail, the door leaves more stable and not easy to fall off.