The Hl14 comes with 6x COOLERGUYS 120X120X25MM 3 PIN FAN MEDIUM.
CG12025M12B2-3Y
- 1700RPM
- 32.5dBA
- 73CFM
- 2.47mm H2O
If you compare the specs of Noctua’s 120mm 3-pin 12V fans, the NF-F12 industrialPPC-2000 comes closest to the CG fan specs.
NF-F12 industrialPPC-2000
- 2000RPM
- 29.7dBA
- 121.8 m3/h (72CFM)
- 3.94mm H2O
The NF-A12x25FLX is comes close, but it has lower CFM and static pressure.
NF-A12x25FLX
- 2000RPM
- 22.6dBA
- 102.1 m3/h (60CFM)
- 2.34mm H2O
So … I’d argue the iPPC-2000 is the best replacement. I run 3x 140mm iPPC-3000s in another build and they’ve been rock solid, no issues.