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Old 03-14-2015, 06:14 PM   #8 (permalink)
freebeard
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I agree with aerohead. Ducts need to be short with a large cross-section. And the volume of air moving through the interior is [orders of magnitude] less than the air moving over the outside. The edge case would be a convertible with the top down.

Here's one that does/should work:
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