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Beta phase: The same applies during the beta phase, where the limitations with interpolated and restricted data from the older, initial fan tests are still in place, but we will gradually complete them over time. Any errors in the software or data entry, we ask you to forgive, and we will make the necessary adjustments as soon as possible. Please send suggestions and feedback exclusively via email to [email protected].

Test methods and equipment

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Fan be quiet Light Wings 140 PWM

Product Images


be quiet
Product name
Light Wings 140 PWM
140 mm
25 mm
264 g

Official Datasheet

Minimum RPM
150 U/min
Maximum RPM
1500 U/min
Min Consumption
1.0 W
Max Consumption
3.8 W
Airflow (CFM)
56.0 CFM
Airflow (m³/h)
95.1 m³/h
Static Pressure (mmH2O)
1.49 mmH2O
23.3 dBA

Datasheet vs. Measured

More Information



Noise Absorption



Measures Values DC

Start-Up Voltage
3.1 V
Shut-Down Voltage
2.8 V
Start-Up DC
350 U/min
Shut-Down DC
327 U/min
DC Analysis

Measures Values PWM

Start-Up RPM
Shut-Down RPM
PWM Analysis

Other Measures

1514 U/min
No-Stop RPM
150 U/min

Compare Sound (Recording)

Case Fan

  • 327
  • 527
  • 727
  • 927
  • 1127
  • 1327



Metric Axis Left


Metric Axis Right


be quiet! Light Wings PWM, 140mm (BL074)

e-tec.atVersandlager: lagernd, Lieferzeit 1-3 Werktage, Express möglichLinz, Wien 15, Wien 20, Zentrale Timelkam: lagerndSalzburg, Wels: 1 WerktagDornbirn, Graz Nord, Graz Süd, Innsbruck, Klagenfurt, St. Pölten, Villach, Wr. Neustadt, Wörgl: 2 WerktageStand: 30.11.23 05:0322,60 €*Stand: 30.11.23 04:29
CSV-Direct.deLagernd im Versandlager - Lieferzeit 2-5 Werktage23,89 €*Stand: 29.11.23 23:52
playox.deLieferbar, Lieferzeit 1-3 Werktage23,89 €*Stand: 29.11.23 22:02
*Alle Preise inkl. gesetzl. MwSt zzgl. Versandkosten und ggf. Nachnahmegebühren, wenn nicht anders beschriebenmit freundlicher Unterstützung von

Compare with other tested fans

Important notes on the tests and their results

The fans tested here were either provided by the manufacturers without preconditions or come from the editorial stock or were anonymously purchased in stores. None of the tests were influenced in any way by the respective manufacturer. The test results were communicated to the manufacturers for review and comment in advance in case of abnormalities or strong contradictions to the stated technical data, and in some cases, measurements were also taken with anonymously purchased retail goods.

We explicitly point out that our laboratory cannot and does not want to produce ISO-certified measurements. The test setups with and without radiators were designed by us to be as practical as possible, in order to capture all intermediate values in the respective speed ranges. The audio recordings were normalized to also transport the smallest nuances into the audible ranges. Therefore, it may well happen that the fans seemed louder than they are. For a comparison of the absolute noise emission of two fans, the measurement curve must always be compared.

The manufacturer information used comes either from the respective packaging or from the data sheets on the respective homepages of the providers. Since we have already found several printing errors and even completely incorrect information, these values should always be viewed with the necessary skepticism if they significantly deviate from our measurements. Moreover, more than once a product has been significantly changed over time without this being publicly communicated. In this case, we ask our readers for appropriate feedback if new contradictions arise.