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Old 11-25-2009, 12:52 PM
sheetmental sheetmental is offline
Join Date: Jan 2005
Location: toronto canada
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the other thing about double wall vanes is that air flowing over the top of the vane travels farther than the air over the bottom of the vane, like an airplane wing. on a wing, it creates a pressure and velocity difference between the area above the wing and below. i would suspect the same rule would apply inside the duct. my instinct tells me it would smooth out the flow by helping to pull the air through the vanes, and keep the velocity up at the same time, while eliminating the static pool that would normally be found in the corner of the square heel. it's just my theory though, i don't know if that's actually true.
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