Well, he essentially claims a 1 deg C diff, between air and water, with an acknowledgement that his probes are +/- 1 deg C accurate.
So in the worst case, the delta T is 2 degrees C, which is reasonable. The thing is, those fans are probably screaming in order to get that delta T, and that's why I'd prefer a blower.
His fan configuration is good, as long as the two push-pulls sets are seperated, which you can't really see.
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