Sliding windows are among top window models widely used in the condominium buildings. Their versatility, ease of use, large glass area and functionality make them also a viable choice for condominium owners. Sliding window usually has two sashes that slide horizontally and require removing sashes for easy in-home cleaning. Some sliding window models have only one sash operating and other fixed. However for greater functionality and optimal ventilation we recommend replacement slider that has both sashes operating.