I ran some test of my own last night, I turned the fans on low, air blowing down. And found the same 7-9 temp difference from the floor to the ceiling. So I reversed them, same temps. I had to turn the fans on high and air blowing down to see equal temps. That's A lot of air!
So today I'm going to grab some 6" pipe and hack me a tube for cheap, I already have a 6" 240 cfm fan left over from the solar air project.
I'll post result as soon as I'm done.
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שְׁמַע יִשְׂרָאֵל ה' אֱלֹהֵינוּ ה' אֶחָד
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