NoiseBlocker BlackSilentPro PK-1 Test and Review

NoiseBlocker BlackSilentPro series features a big variety of models starting from 40mm and up to 140mm models offering a different type of behavior made to provide a lot of possibilities with various revolutions per minute, static pressure, airflow and noise levels.

NoiseBlocker BlackSilentPro series offers four different 140mm models which are:

  1. NoiseBlocker BlackSilentPro PK-1  – made to work at maximum 700 revolutions per minute powered and regulated by 3-pin connector with airflow level of 49.0 cubic metres per hour at only 9 dBA and which I am going to test and review in this article
  2. NoiseBlocker BlackSilentPro PK-2  – made to work at maximum 1200 revolutions per minute powered and regulated by a 3-pin connector with airflow level of 55.0 cubic metres per hour at only 22 dBA and which I’ve already tested a few months ago.
  3. NoiseBlocker BlackSilentPro PK-3 – made to work at maximum 1700 revolutions per minute powered and regulated by a 3-pin connector with airflow level of 153.0 cubic metres per hour at only 33 dBA.
  4. NoiseBlocker BlackSilentPro PK-PS – made to work at maximum 1500 revolutions per minute powered and regulated by a 4- pin PWM connector with airflow level of 121.0 cubic metres per hour at only 29 dBA.

Now let’s check out what NoiseBlocker BlackSilentPro PK-1 has to offer and how it performs.


NoiseBlocker BlackSilentPro PK-1 was provided to me in the classic carton box painted entirely in black featuring a see through cut on the front side of the box, through which you can see the shape of the propellers and part of the frame. Of course on the front side of the box there are some technical details of the product.


Of course the full technical details related to the product are on the back side of the package and fully describes the product, revealing its purpose. But we will talk about this a bit later. First let’s check the structure of the fan.


As part of the NoiseBlocker BlackSilentPro series PK-1 offers the standard structure and colour scheme for the whole series featuring:

  1. A plastic frame with dimensions of 140 x 25mm made of thermoplastic (semi-)crystalline polymer called PBT 20%GF completely painted in black matt
  2. 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 seven a bit wider blades with average blade angle for a steady airflow level, while operating at very low noise level.

And this is what the fan looks like seen from the back:


As you all can see this fan offers the same powering and regulation method used in almost all of the NoiseBlocker BlackSilentPro series models featuring a very short cable with 3 pin connector and 2 extenders with length of 200 and 500mm for powering and regulating the fan.


To power and regulate the fan, the owners of this product can choose between the 2 extenders with different length, which should be plugged to the small connector right next to the fan as you can see on the picture below.


And to install this model on the case fan slot we have 4 metal bolts with 4 metal screws with rubber dumpers included. Of course as part of the NoiseBlocker BlackSilentPro series this fan is supplied with a square 140mm rubber dumper to be installed on the fan and kill any vibrations.


The standard package content for this product features:

  1. Four long bolts and four nuts for mounting
  2. Four rubber dumpers for reducing the vibrations
  3. A rubber dumper for reducing the vibrations
  4. A company sticker
  5. 200mm 3pin sleeved in black cable extender
  6. 500mm 3pin sleeved in black cable extender

Now let’s do some testing…

The tests will be conducted in my standard way. I will mount the fan and test it at 5V/7V/9V/12V and my goal will be to check the performance of the fan in real conditions. 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.

And this is what the fan looks like installed on my test stand:


The test results are shown in the following charts:

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

NoiseBlocker PK-1 A

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

NoiseBlocker PK-1 R

The anemometer showed the following air speed:NoiseBlocker PK-1 S

As always, 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-1 made at least one full revolution at 4.5V and to conduct the first test I had to increase the voltage to 5V.

Test at 5V:

At the first test conducted at 5V the fan was rotating very steadily with 540 revolutions per minute, providing airflow level of 31.2 cubic metres per hour. Of course on this rotating speed the fan was completely silent.

Test at 7V:

At the second test conducted at 7V the fan increased its rotating speed up to 645 revolutions per minute and increased its airflow level up to 41.76 cubic metres per hour. The fan remained completely silent.

Test at 9V:

At the third test conducted at 9V the fan reached up to stable 660 revolutions per minute with airflow level of 44.64 revolutions per minute. The fan was completely silent again.

Test at 12V:

At last test conducted at 12V the NoiseBlocker BlackSilentPro PK-1 reached its maximum rotating speed of 690 revolutions per minute and maximum performance of 47.52 cubic metres per hour. I can’t even think to say there was any noise. The fan was completely silent again.


1. Performance: After I am done testing the product all I can say is:

obviously this model is made for a case fan and case fan only. NoiseBlocker BlackSilentPro PK-1  is meant to be used as support fan with its very, very low noise level and starting voltage and to boost the airflow inside every modern case featuring 140mm case fan slot and I definitely can’t recommend it to be used as a CPU cooler fan. It just can’t provide the airflow needed to cool a heat-sink especially on an overclocked processor.


I will say it again. The black matt and black glossy colour combination is one really good idea which made the fan look very stylish, which can fit and stay neutral in ever modern case or modding project.

I think NoiseBlocker BlackSilentPro PK-1 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.
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