Test Methodology
I use an LW-9266 Fan PQ performance measurement apparatus to evaluate cooling fans. This is a highly sophisticated scientific instrument 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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Hello and thank you for the detailed review of the new Alphacool Apex Stealth Metal 120mm.
After reading your old articles I bought 3× Thermaltake TT TOUGHFAN 14 Pro and 3× Thermaltake TT TOUGHFAN 12 Pro to replace Be Quiet! SILENT WINGS PRO 4 140mm PWM and 120mm (Airflow in a MSI MPG Quietude 100S).
I find the framework to be of higher quality, more mature. I like the wiring without a sleeve, easier to fold and store.
For the same dB noise there is a vastly superior CFM and Static Pressure, and all this for almost a quarter of the price less (in Europe).
I was impatiently waiting for the Alphacool Apex Stealth in 120mm (and 140mm in 2024?) but your rigorous testing proves that there is a problem in the design of the blades.
I saved time and money thanks to you