The details of a glider or a horizontal roller is somewhat similar to that of a double hung window in that there are two sashes and they can move independently. The notable difference being that the double hung operates vertically while the gliders and rollers operate horizontally. Gliders and rollers are a more modern style of window that can offer the ability for large opening expanses in certain situations.
Gliders and rollers operate on wheels and a track very similar to that of a sliding door, as opposed to the double hung that operates on a spring system to help lift the sashes vertically. The added benefit to gliders is that much like a sliding door, the glider can be done in multi-sash configurations in certain situations allowing for larger expanses than what is achievable with double hung and casement windows.
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