Choose a fan with a low noise and low power consumption

Silence at last - or what to do, if a silent operation of a fan matters to us?

This is an archive article published 02/06/2014. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

Despite features of fans being still more improved, it´s still the fact, that they are usually the biggest noise source in devices. If a given device is intended say for a production hall, where an ambient noise is much higher, we probably don´t have to worry about it. But at devices intended for common rooms, offices, households etc., it´s naturally important to maintain the noise of a device as low as possible. If dimensions of a device allow it, it´s usually better and more silent solution to use a fan with a bigger diameter and a lower rotation speed. However, what to do when the size and a design of a fun suit us, but a power, rotation speed and consequently a noise are still uselessly high?

A partial solution is to decrease a supply voltage. Computer enthusiasts know very well, that a noise of a given fan depends (besides its aerodynamic construction) on its rotation speed. Solid producers like Sunon, specify range of operating voltages and a rotation speed at a given voltage (for example 12V). Also in a datasheet can be usually found even a start voltage, at which a given fan will reliably start to rotate. By a change of a supply voltage, we can change a fan speed, but it´s not possible to go below certain speed (at a given fan type). It´s common, that for example a 12V fan still works at 4V (when decreasing from 12 to 4V) but it´s already not able to start at such a low voltage.
Probably the best solution is to use a slower fan (with a lower rotation speed). Today almost every series of fans is available in 2-3 power levels, what reflects in a noise but also in different power consumption. This can be illustrated on 2 types of the same construction - MEC0251V1-A99 (MEC0251V1-0000-A99) and MEC0251V3-A99 (MEC0251V3-0000-A99). As for a mechanical construction, they are the same. The only difference is only in a rotation speed - 3100 vs. 2200 turns per minute. This is then reflected in a noise 44,5 vs. 34 dB and in a power consumption 5,4 vs. 1,9 Watt. The noise difference 10,5 dB is really big ( 6 dB difference is subjectively perceived as a double volume) and in many cases it´s surely not negligible even a power consumption difference of approx. -65%. Should you still be satisfied with a lower air flow, it´s naturally possible even at these slower types further decrease rotation speed by decreasing a supply voltage. Naturally, there are even more silent fans on the market, but types from company Sunon offer a very good compromise among noise, power and a price.

Upon request we´re able to provide you any version from the Sunon portfolio in a short lead time.
In case of interest, please contact us at info@soselectronic.com.

Advantages/ Features:

  • possibility to choose a fan exactly by the application requirements
  • lower noise
  • lower power consumption
  • longer supposed lifetime at lower rotation speed

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Competition with the following question has been published here:

What´s the name of the motor used in the MEC series fans?

The correct answer was: MagLev
We have drawn the following winners:
Karel Pruška [CZ]
Petr Kouba [CZ]
Gábor Stumphauzer [HU]
Congratulations to winners. We´ll inform them by e-mail.

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