Looking for some fans and appropriate controllers for variable speed

Hardware
1

Hi,

Short version: what device should I use to provide valuable voltage for a 6V-12V fan?

Long version: I have a closed enclosure, made of plasterwall, very close to a wall that tends to get wet from water seeping in from outside. (The room is partially under the ground level.) I want to avoid humidity accumulating in this closed space, so that I can avoid mold and other unwanted stuff.

Therefore I have a few ventilation holes on the enclosure, but apparently natural circulation just doesn’t cut it. I have recently introduced a DTH22 sensor, and I see RH values above 80%, which outside this box it’s 50-60%.

So I added 3 fans, all 80x80x15mm, 12V, see here: https://www2.mouser.com/ProductDetail/NMB-Technologies/3106KL-04W-B59-B50?qs=4W3PNmGdEWEvRGqCjBbe%252BQ%3D%3D

My original idea was that I will control the speeds using a Shelly RGBW2, which has 0-12V output, but unfortunately, while great for LED strips, the led controller can’t even move then fans, they just give a whining noise. Different load characteristics, I guess.

So I just gave 12V to the fans, with an on/off switch via a Shell Plus1 relay. This works, but the noise is too much, so I definitely need fan speed control.

But how? Based on the specs, the fan should be able to run between 6V and 13V.

What device should I use to provide valuable voltage for the fan?

Would I have better luck with a Shelly Plus RGBW? (According to the specs, it has PWM speed at 22Khz, as opposed to Shelly RGBW2, which is 960 Hz.)

Or can someone recommend another good device that works nice with HA, with no cloud dependency?

(I am also open to replacing the fans with other models that fit the size, if necessary.)

Thank you.

2

According to the documentation, the new Shelly Dimmer 0/1-10V PM Gen3 will be able to take on some direct loads:

Supported load types

  • 0-10V signal control for multiple types of drivers (lights, motors, valves, etc.)
  • 1-10V signal control
  • Resistive (incandescent bulbs, heating appliances)
  • Capacitive (capacitor banks, electronic equipment, motor starting capacitors)
  • Inductive with RC Snubber (LED light drivers, transformers, fans, refrigerators, air-conditioners, washing machines, tumble dryers)

The last entry is what interests me.
Maybe I could just use this (with an RC snubber), and call it a day?

Too bad it’s not available for shipping yet.

Can you recommend a similar device that would work?

Thank you

3

Give it 6V and observe if noise level is acceptable.
If you really need to have speed control, those “3-wire” fans like very low pwm frequency, in range of 30Hz.