I used a 12v 40mm fan on a voltage regulator (see image). It turned out to be ok but noisy. I bought this 60mm USB powered. It fits much better, airflow is about the same. Very little noise. The voltage regulator works cool. I was surprised that this set of 2 comes with two chrome trims. Didn't expect that. Try using a small wire tie to secure thin wire to the cabinet or trellis. If you move it, it will most likely break. I did that, no problem.
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