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Use a 5 volt regulator like the LM7805 which can be bought just about anywhere and can be seen here.
That assumes this fan does not draw any power to speak of. A link to the fan data sheet would be nice. Also, the fan likely will not run long on a standard 9 volt battery.
The simplest solution (though not ideal) might be just a suitable series resistor. Pity we don't have more details of the fan and how concerned the OP is about fan speed.
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