It completely depends on the fan. Some fans are nothing but a simple DC motor circuit. Other fans have a bit more circutry under there, like diodes & transistors - these would prevent a reversed polarity from working.
All my Adda fans work just fine reversed, but it's almost pointless to do so. Reversing polarity would cause opposite fan rotation, and less air flow. You could just flip the fan around for easier & better results.
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