2 Track UPVC Sliding Windows
In a two-track UPVC sliding windows, the half-screen and the outer pane or sash both rest in the two outside tracks.
The inside pane rests in a separate track and may be raised to allow fresh air into your home.
3 Track UPVC Sliding Window
Integrated insect screen can be removed for cleaning. In a triple-track UPVC sliding windows, each pane and the half screen rests on its own individual track, so each sash can move independently. You can also move both glass panes to the bottom of the UPVC sliding windows with the screen at the top for better cross ventilation during temperature weather.