The sliding window is slid on the track on the window frame by using a sash equipped with a pulley. The advantage of this window is that the window does not occupy extra space in the switching state, and the structure is relatively simple. However, the disadvantage is that only up to 50% of the sash can be opened, and the airtightness is poor when closed. In recent years, there have been improved sliding windows using new technology that can push multiple sashes to one side for folding. At the same time, there are also sliding windows that improve air tightness, but in general, the thermal performance of the casement window is still not achieved, and the energy consumption is high, so such windows are rarely used in advanced countries.
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