Don't stress. If its a 120/240V AC 120mm fan they can be pretty loud. So can the 12V units. All you need to do is use a dimmer switch on the 120/240V AC fans or if its a 12V unit, a suitable resistor. By cutting the output, it will lower the noise. You then need to find a 'sweet-spot' where the noise decrease and performance hit are just right for you!
Cheers
Memphis
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