Test Methodology
I use an LW-9266 Fan PQ performance measurement apparatus to evaluate cooling fans. This highly sophisticated scientific instrument was made in Taiwan by Long Win.
Fan Testing Machine Technical Specifications:
- Manufacturer: Long Win Science & Technology Corporation
- Air Flow Rate: 2.4 – 250 CFM
- Accuracy of Air Flow Rage: <3.5% INFS
- Repeatability error: < 2%
- Static pressure: 0-20mmAq (100mmAq with the high static pressure throttle device)
- Overall Dimensions: 0.7 (W) x 2.2 (L) x 1.6 (H) m
- Power Source: 220VAC, 5A, Single Phase, 50/60Hz
- Based on Standards: ISO 5801-2007, AMCA 210-0, ASHRAE 51-2007, IEC 61591-2005, GB/T 1236-200
Besides the Long Win machine, I also use the following equipment.
Testing Equipment:
- Noise Test Environment: Hemi-Anechoic Chamber with 6 dB(A) noise floor
- Conditions: 25 (+-2) degrees Celsius, 40-50% humidity
- Sound Analyzer: Bruel & Kjaer 2270-S G4
- Microphone: Bruel & Kjaer Type 4955-A
- Mic Calibrator: Bruel & Kjaer Type 4231
- Data Logger: Picoscope TC-08
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even the LS variant spins nearly 2x too fast for most uses if you care about noise so existence of this variant is bizarre to say the least
and if you want performance at all costs T30 or some monster from Delta will be your friend
The T30 is a monster, for 30mm thickness.
it’s a weird one, extra thickness and top speed make it less fit for the consumer grade, but it isn’t going as far as industrial/server fans relying on the brute force and thickness alone as it uses better materials and tight tip clearance like Noctua does
probably makes most sense when you don’t want to build a rack but have a technical room to put the machine in and just run these at full speed to not worry about anything
at low speeds it’s fine for regular use if your PWM controller doesn’t make it stop despite using it in performance or advanced mode (hybrid stopping at 50% makes no sense imo as that 50% is still loud) but requires some extra space and you won’t be using that extra speed at all