So we purchased an acoustic grade panel to help with tamping down the noise of nearby highway traffic.
The insert has helped somewhat but not to the level we expected. We have already replaced one window facing the highway in an adjoining room with a Pella triple pane and that window does a better job than the Indow panel.
Of course the cost is a lot more for the window as well versus the insert. We had hoped that the insert would be at least as good as the Pella window if not better and we were going to order some more. Now not sure.
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