When testing the fan previously I noticed that some of the fumes seemed to loop up and over the fan when they were sucked away from the source of the smoke. I designed a couple methods to mitigate that problem but this one seems the most promising. It is just a thin pull out shroud that extends about 15mm from the fan face and should help keep the flow a bit more directed. The other idea was to have the handle swing to partly shroud the fan. The problem with that idea was that it would have been very leaky and probably would have been less effective. I have yet to test this, and the pics above are just test parts, but once I get the fuse holder, I can fully print and test the works.
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