DEnd, good ideas, in the beginning I was thinking the same thing, but more along the lines of opening the window and inserting a frame into the window that had a layer of thin aluminum foil.
With the forced air setup I believe I can remove a lot more btus. My pipe will have 5 square feet per 5 foot section, I was planning on 2 sections so 10 feet so 50 btus without without air flow, the material is not smooth so I should have good turbulence. I am going to do a rough setup and measure temp drop on a data logger.
What I really need is a material that allows air in and keeps moisture out!
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