It's pretty easy to find 120mm fans in the 100 CFM range. (Delta is one common brand.) A few are even into the 200 CFM range. How much area do you have to work with? The little 5000 BTU unit I hacked long ago had enough area to fit 6 120mm fans, but I only put 2 because that's enough.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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