Commerical horizontal opening double glazed black aluminum sliding windows on China WDMAProduct Description Products fratures advantage: The sliding window or door is made up of two(or more) sashes that slide horizontally,to the left or right,on tracks. The sliding window and door can be made wider and taller with the addition of sashes. Sliding window does not occupy indoor and outdoor space, free to control the opening area, easy operation. Particularly suitable for use on window sills. Using high grade rail, gently push, open