Paul,
          This is kinda off subject due to it being on a chicken barn. So,
          you may want to contact me privately and tell me to
          take my fan and ......
          Either way, thanks.
          Dave D

   Paul,
   I am a bit confused. But here is the question(s) I have that really does
   relate to rotary exhaust, just without the heat and velocity.
   These large fans exhaust air out of the barns horizontally and the air
   currents / wind at that time carry the air and particulates across the
   ground (to aggrevate me).
   I am trying to give the company some info / facts that ducting that
   exhaust UP and away would allow neighbors and me to breath better.
   And possibly a baffle to restrict the particulates or at least some of
   them from going into the air.
   The fans presently are belled on the outside.  Which the company says
   allows the air to loose energy and more easily escape the confines of
   the duct.  (Hmm, really?)
   All this is much the same with the rotary exh, most often due to
   necessity, bend 90 degrees into an expanding volume and baffle /
   diverter plates to further reduce energy.
   Seems very similar.  Where do I get some info?
   If I don't get them to do something with the smell, you guys will not
   want to fly to the farm airstrip for a visit.  :(
   But, if I do get them to duct the air UP, it is recommended to hold your
   breath while in the pattern.
   Thanks,    Dave D


   Ducting the air up 90 degrees will help just a little bit as far as
   the stink
   of just the air is concerned. What will really help is the
   particulate content of the
   air, if any, will be removed. It will accumulate inside the 90 bend
   due to centrifugal force
   throwing  the particulate outwards towards the outside wall. This
   will have
   to be cleaned from time to time depending how much particulate is in
   the air.
   That alone should reduce the stink from just the particulate itself.
   As it is now that stuff is falling to the ground and accumulating
   and of course
   stinking in the process.

   Paul Lamar ...No rotor no motor.

Paul,
Well of course, just like the heat and energy hitting the outside wall
of the bend just inches from the exhaust port opening.
Any suggestion of what type of surface inside the tube?
Maybe a removable panel acting as the filter, without restriction of air
flow, too much?
OR, directing the flow downward toward the ground.  Even a  substance to
collect the particulate, keeping it there,  vs pumping it out or up into
the air for all neighbors to breath.
I just wonder if they have already tried some of this and didn't like
the additional cost and work of cleaning the ducts and whatever type
filtering method.   Probably frequently.
Lets see, 20K sq ft, with 25K chickens per, times 30 barns and building
more....lots of particulate stink.
Maybe just time for me to move.  They're not going to change the
location of the barns relative to surrounding farm houses, even tho we
were here long before them.
Big corporations doing as they like.

Thanks so much Paul.  You've got me rolling now.
Dave D
ps. One last thing.  It always stinks worse away from the barns, at the
surrounding farm homes, compared to being right around the barns.
What's up with that? How come?
Are we(neighbors) getting the greater dose of particulates due to
slowing air velocity?  It's the worst in calm winds.

The fixed volume of stink coming out of the barn is being diluted more by the higher winds.