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Interesting thread...
All the windowns we have which are supposed to open or close for ventilation DO have screens. The emergency exit windows (1 in the BR, 1 in tghe LR)do not. I have opened those windows only once, just to make sure they do come open. They aren't used, nor do I believe they are designed to be used, for ventilation. There is a smaller, screened window, opened or closed by a turning a knob, as part of both of those two window assemblies, plus several others in other locations.
Looks like it all depends on Model, year and, maybe, dual pane windows or not, but I can't imagine how that would make a difference...
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