Originally Posted by IAm5toned

im not sure if you can wire pc fans in series, ive never tried it myself.. they will work better wired in parallel. series circuits draw more current than than parallel circuits but the way you would do it is-
connect the red positive wire on the first fan to the positive on the power supply.
connect the black negative wire on the first fan to the positive red wire on the second fan.
repeat this step for as many fans as your using
connect the final black negative wire to the power supply negative

to wire them in parallel (recommended)
connect all the red wires to the positive on the power supply
connect all the black wires to negative on the power supply