A 12 v AC adapter or a LED transformer such as for LED strip light strips.

You might even have a spare AC adapter lying around. For the fan, I scavenged from a PC power supply.

There are various ways to wire the adapter to the fan; some more elegant than others. Perhaps even an on/off switch inline if desired. I recommend plugging it into a cheap timer outlet to cycle briefly once or twice a day. It doesn’t have to run continuously.


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