Review on Noiseblocker NB ELoop Bionic 33 73CFM 7 83DBA by Stanisaw Lewczuk ᠌

In general, a very good, high-quality and practically silent cooler in any orientation (with some peculiarities in placement and connection). It's more of a cabinet version (the rotational speed will not be enough for a radiator) well suited for quiet systems. With its pros: 1. With an unusual design, it produces a noticeable airflow despite the low speed. 2. There are no parasitic overtones in the operation of the bearing. The bearing itself is very quiet. Most likely, it is based on a rolling bearing, so its operation does not depend on orientation in space. And indeed, in any position, the fan works equally well. 3. The engine is also practically silent - it can only be distinguished from a distance of several centimeters in complete silence. 4. The impeller is perfectly balanced - vibrations are practically not noticeable, and through anti-vibration mounts they generally disappear. 5. The air flow is much less noisy (due to the unusual design of the impeller) compared to a fan with conventional blades. 6. Convenient detachable cables allow you to choose the desired length (or remove them altogether if connected, for example, to a speed controller). 7. Unusual look) Has cons: Rather, observations, unlived really flaws: 1. When changing speed, the ringing of the bearing is heard for several seconds. As soon as the speed is established constant, everything subsides. Therefore, it is unlikely to be suitable for the case of automatic speed control. Fortunately, both at maximum speed and at minimum, the fan is almost equally quiet, so you can safely turn it on to the fullest. 2. The unusual shape of the impeller not only reduces the overall noise of the air flow, but also shifts the frequency of its sound to a higher region - perhaps someone (with a unique ear for music))) will not like it. In faster models, this is probably even more noticeable. 3. If you place the fan in such a way that there is a large-mesh grill in the way of air intake, it will begin to emit, although weak, but not too pleasant, a high rumble. This is apparently due, again, to the unusual impeller and frame. Here, if you do not resort to radical measures (cut out this grille altogether - by and large, such grilles amplify the noise of any cooler, while reducing the air flow), the logical decision is to move the fan to the other side - so that the grille is at the back (although this is not always possible).