Simple foil tape may be all you need!
The raw data is on our website, here: www.thefitrv.com/rv-tips/rv-a...
You can also leave comments and ask questions over there and I'll get right back to you.
There are a lot of videos on KZread of folks making styrofoam teepees and sticking them inside their air conditioners' plenums. There's even a commercial version made by RV Airflow Systems, which I tested in this video. And then I modified that product and tested it again!

Your results may vary based on your ducting setup.
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