into a ten cent tail wagging a forty dollar dog.
>
> Get some flat weather stripping.  Make the outside tube large enough to
> accept the weather stripping.  You'll want one side of the stripping
> attached to the inside tube, with the other side folded over.  As the
> intake tries to suck air, it'll pull the strip out against the outside
> tube.  You'll get a perfect seal every time.
>
> Put the plenum on an X-Y table.  I wouldn't think that it would have to
> travel more than a few inches, and moving the plenum 1" will give you 2"
> more tube.
>
>
> --
> http://www.ernest.isa-geek.org/
> "Ignorance is mankinds normal state,
>    alleviated by information and experience."
>                                    Veeduber
>
>
 Interesting suggestions Earnest,  Thanks

Having any outside air attempting to come in deploy the strip to seal is
worth further consideration/    I might try something a bit smaller than
weather strip - but same concept.

I considered an X-Y table but the ones I found were rather on the expensive
side.  There was one basically a Y side that was made of UHDM plastic with
aluminum rails that looked promissing.  I had intially consider a drawer
slider support with ball bearings.  Certainly can carry the load, but
probably too sloppy in maintaining alignment.

Keep 'em coming

Ed Anderson