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Message: <blockquote data-quote="PaulD" data-source="post: 4485324" data-attributes="member: 589636"><p>If you connect a DC fan up backwards (black to +12V and red to Gnd) it will do ....... NOTHING, it won't spin.  AC Fans will run backwards, which will still be useless becasue the blades are set a certain way.  The way to decide whether a fan is a push or a pull is look for the arrows on plastic casing, one has the rotation direction and the other has air flow direction - mount the fan so that the arrow points in the direction you want the air to flow.</p></blockquote><p></p>

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