Ok..Then Kinro is the supplier for our windows. We have the single pane and they are stamped KTG. Was not sure about the dual pane.Still have not foud the spec's for the dual pane windows. The only information we have is that which came from Keystone folks like Charles Wade Mentioned above and others. We would have ordered them for the sound deadening but at the time we ordered ours here was a question about weight that turned out to be false.
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