V. E. Welch wrote:

There has been some discussion of turning vanes to direct air flow.  Do you
have a picture or sketch?  I don't think I've ever seen any turning vanes.

Vince

Just glance at the air outlets on your car heater/air conditioner.
Turning vanes! No more complicated than that. The drawback in a duct
is they add drag.

Paul Lamar
 
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