One of the other most important elements of the window performance is installation. However, it is more than window features that help support noise reduction. Using high-quality materials, such as lab-tested weatherstripping on the windows, is also a proven way to ensure proper performance. This selection process of these different features for a window is critical to the performance of sound reduction. In windows, this can be done by optimizing the air space, mixing the thicknesses of glass or by adding additional panes of glass. As sound waves travel through different materials, the waves can be absorbed, reflected or minimized. Noise reducing windows work by slowing the transfer of sound waves, which makes them seem quieter. By adding more windowpanes, there are more layers of insulation which helps to dampen outside noises. These dual-pane windows feature two panes of 3mm glass. Today, most standard insulating windows have STC ratings around 26. They are measured in two ways - by Sound Transmission Class (STC) and Outdoor/Indoor Transmission Class (OITC). Noises travel in two different ways - through the air and through materials.
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