Jim Korman wrote:
> It is rather quiet, but didn't think that the air flow was
> that much smoother that what I've upstairs right now.

It can be perfectly smooth coming out of the duct, but it's going to become
turbulent a short distance after that anyway.  That's why all that hype
about smoothness is silly.  There is a equation that describes exactly this
that relies on the Reynolds number, but I don't remember the details.  I'm
sure a quick net search will yield many copies.  If someone here chases it
down and plugs in plausible parameters, please let us know at what distance
the laminar flow is expected to become turbulent.


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