I am sure someone else will jump in here to explain it to you but as I understand it dual pane would mean two panes with air space between them.
Or at least that is how the windows are in our stick built home.
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Everett & Joan after 60 years together. 2004 1/2 ton Chevy & 2011 Rockwood 1809S
Number of nights camped in 2012 65
Number of nights camped in 2013 82
Number of nights camped in 2014 105!
Number of nights camped in 2015 81
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