I've recently purchased a "fume extractor" from China which is basically a filter with a pc fan behind it. The Fan pre-installed isn't really doing much of anything and I would like to replace it with a powerful PC fan that I have lying around.

Pictures can be found here: https://imgur.com/a/Fm3p6lt

I have a multimeter lying around but am not really proficient with it. The diagrams that I can find on the web for PWM fans state that Black should be ground and yellow should be 12v. The pre installed fan only sported 2 wires instead of the 4 of mine and thus isn't anything to go by.

Can I just hook up the ground / 12v wire to the corresponding wires from the "fume extractor" or is there anything else I should be aware of?

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    – isherwood
    Mar 18, 2020 at 14:14
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    The one picture shows a AC voltage of 90 - 265V. Is that the fan you want to hook up to 12V DC? I'm missing something.
    – JACK
    Mar 18, 2020 at 15:24

2 Answers 2


Yes you can just hook up the fan to +12V (yellow) and Ground (black) and ignore the control lines of the fan. They are for fan speed control to reduce noise in a computer. If they are not connected, fan runs always at full speed.


The additional wires are probably speed reporting and/or variable speed control. They can likely be ignored.

More on that

You'll want to be sure that your fan isn't a 5v unit, though.

  • According to the specs it is 0.1A, 1.2W, DC12V
    – Apury
    Mar 18, 2020 at 13:58

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