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NoiseBlocker BlackSilentFan XK-1 and XK-2 review

NoiseBlocker BlackSilentFan XK 140mm fan series is made of  two different models offering the same fan structure with different performance:

  1. NoiseBlocker BlackSilentFan XK-1 – 800 revolutions per minute with airflow level of 60 cubic metres per hour at only 12dBA
  2. NoiseBlocker BlackSilentFan XK-2 – 1100 revolutions per minute with airflow level of 85 cubic metres per hour at only 19dBA

For this test and review I will test both models and add the missing data for these models to the 140mm fans catalogue.


Both of the fans arrived with visually almost the same packages which are made of transparent plastic cover and black back carton holding the package together. Of course, all of the technical details are on the back side of the carton part.


Before I start checking the fans themselves I believe it is time to say that both fans offer absolutely the same structure, while the only difference between both models is the performance they offer. So keep in mind that when I talk about the XK-1 model, that applies to XK-2, too.

NoiseBlocker BlackSilentFan XK-1


NoiseBlocker BlackSilentFan XK-2


Both of the fans offer pretty standard structure made of a square plastic frame with dimensions 140 x 140 x 25mm painted in black and a propeller with 7 semi-transparent painted in blue blades with average angle which are supposed to deliver constant airflow at very low noise level.

NoiseBlocker BlackSilentFan XK-1


NoiseBlocker BlackSilentFan XK-2


The power and the regulation for both of the models is done via quite a long cable with black sleeving kit, which made me think they are supposed to work as case fans and case fans only. The interesting part is that even though they look pretty the same, they offer very different work method. The first model starts at a bit higher starting voltage but is limited to 800 revolutions per minute with some variation, while the second starts at 4.5V and reaches up to 1100 revolutions per minute with some variation.


Both of the models are in a package with absolutely the same content which offers 4 metal screws for installing the fan to any of the case fan slots of every modern case.

Now I believe it is time for testing:

The tests for the 2 samples will be conducted in my standard way. I will mount both test samples together and test them at 5V/7V/9V/12V and my goal will be to check the authenticity of the technical characteristics given by the manufacturer. The products will be tested under close-to-perfect conditions, not taking into account any external factors. The results achieved during the test can in no way be the same if the fans are mounted on a cooler or on the case fan hole of any modern computer case. I will measure the amount of air going through the fans for one hour and its speed. For this I use a fan controller, a voltage meter, an anemometer and a stand made specifically for this purpose.

And this is how both fans look installed on my test stand:


The test results are shown in the following charts:

Airflow through the fans at 5V, 7V, 9V, 12V.

NoiseBlocker BlackSilent XK1 and XK2 Airflow

Propellers rpm during the tests at 5V, 7V, 9V, 12V.

NoiseBlocker BlackSilent XK1 and XK2 RPM

The anemometer showed the following air speed passing through the fans:

NoiseBlocker BlackSilent XK1 and XK2 Speed

After mounting both of the fans onto the stand and leaving them to run for about 30 minutes at maximum speed, it was time for the tests to begin.

As with my other tests, again I started with a gradual increase of the voltage through the Lamptron FCT starting at 0V and NoiseBlocker BlackSilentFan XK-1 made one full revolution at 5V, while the second model made at least one full revolution at 4.5V.

Test at 5V:

Both fans started rotating normally and the first test conducted at 5V made NoiseBlocker BlackSilentFan XK-1 work at 420 revolutions per minute with maximum airflow level of 21.6 cubic metres per hour. NoiseBlocker BlackSilentFan XK-2 was a bit faster with 600 revolutions per minute and airflow level of 36 cubic metres per hour. At the 5V test both of the fans were completely silent.

Test at 7V:

The second test for both models was conducted at 7V and at this operational voltage NoiseBlocker BlackSilentFan XK-1 reached airflow level of 33.12 cubic metres per hour at only 570 revolutions per minute. Of course, the second model was a bit faster again with 750 revolutions per minute and airflow level of 48.48 cubic metres per hour. Again both of the fans were completely silent.

Test at 9V:

The third test was made at 9V and NoiseBlocker BlackSilentFan XK-1 reached a maximum of 720 revolutions per minute with airflow level of 44.64 cubic metres per hour. The second model was rotating with 930 revolutions per minute providing airflow level of 58.56 cubic metres per hour. For the third time both of the fans were completely silent.

Test at 12V:

The last test was made at 12V and both of the fans reached their maximum performance, which for NoiseBlocker BlackSilentFan XK-1 was 57.6 cubic metres per hour and 900 revolutions per minute. NoiseBlocker BlackSilentFan XK-2 reached 1155 revolutions per minute and airflow level of 71.52 cubic metres per hour.  Again both fans were completely silent.


  1. Performance: Both models from NoiseBlocker BlackSilentFan XK 140mm fan series are the perfect examples of case fans made to support the airflow circulation inside the case. Both of the fans provide very decent airflow level for this purpose at extremely low noise level. The long cables help a lot too granting the option to attach the 3-pin power connector directly to the motherboard from everywhere inside the case.
  2. Noise level: Both of the fans were completely silent during all tests conducted at 5,7,9 and 12V.
  3. Appearance:  Both of the fans offer very stylish appearance combined with nice black/blue colour scheme.

I think NoiseBlocker BlackSilentFan XK-1 deserves the following reward:


And NoiseBlocker BlackSilentFan XK-2 deserves:


NoiseBlocker BlackSilentFan XK-1 and XK-2  have been added to the 140mm catalogue.

Official price (MSRP):

NoiseBlocker BlackSilentFan XK-1 – unknown

Warranty: unknown

NoiseBlocker BlackSilentFan XK-2 – unknown

Warranty: unknown


I thank NoiseBlocker for the test sample.

Dobrin Krastev is the owner, reviewer and newsman of www.DVTests.com with more than 15 years' experience in personal computers, server and storage systems, UPS, peripheral devices and software. Passionate about testing and reviewing, AMD overclocking using AM3 990FXA and AMD FM2 A85X test systems and building modding projects.

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