NoiseBlocker BlackSilentPro PK-2 review

So what is NoiseBlocker BlackSilentPro actually? This is the premium class series from NoiseBlocker which offers 8 different models made in 3 different dimensions. For this test and review I will deal with NoiseBlocker BlackSilentPro PK-2, which is the second model from the 140mm type of BlackSilentPro series.

Again, we will see some nice features and innovations but still this fan is not a new model.

And before I start with the review I just want to mention that I’ve tested this exact model back in 2010 but seems the package is modified.Maybe the performance too.

So let’s get started…

The fan arrived in a very stylish carton box in black and white and again a huge picture of the fan with the additional accessories on the front of the package. Apart from the picture there  are some important technitecal details for the fan placed on the front bottom right part.  Of course the full technical specification is on the back of the black carton box.

For the full technical details check the picture above or just go to the official web page for the BlackSilentPro series: NoiseBlocker BlackSilentPro

So let’s look at the fan itself:

After I took the fan out of the package I saw a very standard 140 x 140 x 25mm plastic frame made of thermoplastic (semi-)crystalline polymer called PBT 20%GF painted in black matt colour and a propeller made of a high-tech polycarbonate material called Makrolon (Makrolon® is the trade name used for the polycarbonate from Bayer MaterialScience) painted in black glossy colour. The propeller offers 7 blades with average blade angle for a steady airflow level at low noise level.

and seen from the back:

As you all can see this fan offers the same powering and regulation method used in many NoiseBlocker models. The fan offers a very short cable with 3 pin connector and 2 extenders for powering and regulating the fan.

Again the fan offers the same package content with a minor change:

  1. Four long bolts and four nuts for mounting
  2. Four rubber dumpers for reducing the vibrations
  3. A rubber gasket for reducing the vibrations
  4. A company sticker which I will gladly stick to my test stand
  5. 200mm 3pin sleeved in black cable extender
  6. 500mm 3pin sleeved in black cable extender
So far I’ve seen two changes:
  1. The box of the fan was modified
  2. A company sticker was added to the package
So let’s check if the performance is the same or modified too.
The tests will be conducted in my standard way. I will mount the sample and test it at 5V/7V/9V/12V and my goal will be to check the authenticity of the technical characteristics given by the manufacturer. The product 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 fan is 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 fan 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.

The test results are shown in the following charts:

Airflow through the fan at 5V, 7V, 9V, 12V

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

The anemometer showed the following air speed:

After mounting the fan onto the stand and leaving it 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 the NoiseBlocker BlackSilentPro PK-2 made one full revolution at 3.5V and to conduct the first test I had to increase the voltage to 5V.

Test at 5V:

After I left it to work for 2 mins on 5V and the fan reached 600 revolutions per minute I measured an airflow level of 35.52 cubic metres per hour. At this speed the fan was absolutely silent.

Test at 7V:

In the second test the fan reached an airflow level of 52.8 cubic metres per hour at only 840 revolutions per minute. Again it was absolutely silent.

Test at 9V:

The third test was conducted at 9V and BlackSilentPro PK-2 was rotating with 1010 revolutions per minute and provided an airflow level of 66.24 cubic metres per hour. And again the fan was silent.

Test at 12V:

The last test was conducted at 12V showed his full potential with airflow level of 82.56 cubic metres per hour at 1260 revolutions per minute. There was a tiny noise from the air passing through the fan.


  1. Performance: it’s clear that the fan is made for mounting on case fan slots because of the low starting voltage that will make it easily controlled on 5V for low noise level. I can say it could be used to work as a fan cooling a CPU radiator but only at default frequency. I can’t recommend it to cool a cooler on overclocked processor.
  2. Noise level: I said it before and I will say same thing now. The fan is extremely silent and is great to be mounted as a case fan improving the airflow inside the case.
  3. Apperance:  I really like the black matt and black glossy colour combination. Very stylish and can work in every modern or older case.

The only disadvantage of this fan is the lack of PWM regulation, but after I saw it’s performance I can say it’s not needed.

So I can say the fan is absolutely the same with new package and an extra advertising sticker as a package content.

I think NoiseBlocker BlackSilentPro PK-2 deserves the following reward:


NoiseBlocker BlackSilentPro PK-2  has been added to the 140mm catalogue.

Official price (MSRP)unknown

Official warranty: 60 months

I thank NoiseBlocker for the test sample.

Dobrin Krastev is the owner, reviewer and newsman of 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.
1 Comment
  1. Reply Stuen4y 06.11.2012 at 10:38

    Given the reliability and the silence they did not put that much effort in the design. Otherwise a great case fan from Noiseblocker, as always. Great effort from you, Dobrin, as well.

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