What is this part of the window construction for?
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Actually we don't have VSG in the windows (just the RC2N fittings) but this looks like double panes inside and out? It can't be, can it?
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Do you have floor to ceiling windows with a bottom fixed section?
Yup, you're right, we have two places. Then that will be a screen for it. I didn't even think about that.
Answer
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There should be all kinds of text printed in the frame, see if you can make anything out.