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rain- gutter
I believe that there's also some 'air-fence' performance designed in as well. To segregate the fast, low-pressure over-roof flow, from the slower, higher-pressure side-flow.
They'd also pickup some extra 'beaming' strength across that longitudinal span.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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