I'm looking for a replacement to the noisy fans for a server 2U chassis. The front of the chassis is filled with the hard disks, which means that there is little space for air flow, which, in turn, means that I need fans with high static pressure.
The original fans have the following specification:
- Rated current: 0.60 A.
- Fan speed: 7,000 RPM.
- Air flow: 72.5 CFM.
- Static pressure: 27.69 mm/H₂O.
- Noise: 53.5 dB(A).
The server will be heavily underused (storage only; CPU usage will remain relatively low), which means that the replacement fans can have one third the original static pressure value or ideally up to a half. So the requirements are:
- PWM (4-pin).
- Size between 80×80×25 and 80×80×38.
- Static pressure superior to 10 mm/H₂O (or to 15 mm/H₂O).
- Noise level inferior to 35 dB(A).
- Price inferior to $40.
Generic fans such as Noctua NF-A8 PWM cannot be used. While the air flow is not bad (32.7 CFM), the static pressure is too low (2.37 mm/H₂O).
There is Silverstone FM81 which has an acceptable static pressure of 13.78 mm/H₂O, but it's also noisy at 48.0 dB(A).
What are my options?