FAN replacement for DS218+/ ds220+/ Ds220j / DS920+ and other models Noctua NF-A4x20 FLX, Premium Quiet Fan, 3-Pin (40x20mm) - UK USA Noctua NF-A8 PWM Quiet Fan, 4-Pin (80mm, Black) - UK USA Noctua NF-A9 FLX, Premium Quiet Fan, 3-Pin (92mm, Brown) - UK U