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Old computer fans from desktop PC cases can be turned into useful duct fans. Drawing minimal amperage at 12v DC, they don't push much air in a hurry. But through out the course of a day they can. Possibly useful for exhaust fans in kitchens or bathrooms or to circulate air through small solar panels.




Knight chess-piece contour taken from Sargon I chess program; 1978 for Apple II .



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