The fan blows below the light across the water so that more water evaporates keeping it cooler. The fan is just zip tied to the pvc and the pvc has 45 degree joints at the bottom of the 4 legs so it isn't real tight but it sits on there nicely. It is a 12v fan I had sitting around that I just wired up to an orphaned wall transformer. Nice and cheep ( I already had everything ) and effective.
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