Wind-resistant and vibration absorbing
The straight materials on the inner frame are of a hollow design and have good effects for resisting wind and absorbing vibrations
The inner and outer frames are flexibly jointed, with triple seals used (one glue strip and two wool strips)
These provide excellent air and water tightness, and ensure windows slide freely and silently
The oblique stepped structure and the drain in the downward slide ensure free water discharge without any back-flow
The window's hollow glass structure provides excellent sound and thermal insulation