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You'd probably not get much out of it because the flow is low to moderate, but there's somewhere where you want air to be flowing- what about in the airstream to the cabin air feed? There's a fan in there already (albeit usually a radial-bladed squirrel-cage fan) but most of the time I like having some sort of airflow through the cabin, and this occurs even with the fan off, with the vehicle in motion.
Not sure how much energy would be in that gas flow though. Probably not much as the route to exit into the cabin is usually convoluted and the gearing on the fan is 1:1...
--Phil
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