Nidec 120mm x 38mm 12V 40W Super High Speed Fan, Extreme Air Flow 220 CFM Nidec 120mm x 38mm 12V 40W Super High Speed Fan, Extreme Air Flow 220 CFM Nidec V34809-9 Fan PWM Function 4-Wire Fan 4-PIN Connector Plug: Black=Negative; Red=Positive; Yellow=RPM; Green=PWM