Well, I'm interested to hear what other people think, but it seems like it depends on how warm it is outside. If it's quite warm, you probably just want to blow air out. If it's cooler, blow warm air in. But perhaps the best way is to set up two fans, one blowing in and one blowing out, so that you have a nice cross breeze.
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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."
"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."
-- Friedrich Nietzsche
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