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There are two major supliers for RV dual pane windows..not to be confused with Thermo pane windows...two diffent things.. HEHR and Atwood windows.
It is hard to find the heat and sound spec's for the windows but they are there somewhere. Interesting reading..if at all interested. Aso kinro windows which is part of Drew Industries, which also owns Lippert, which is in Goshen and Elkhart, Ind. My best guess as the supplier.
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