My incubator is set up with 3 fans. Due to it using light bulbs inside PVC. So the hole-punched PVC has 1 fan installed in each end just behind each of the 2 bulbs to push the heat through the PVC tubing which snakes like a figure 8 on the bottom. Then one fan directly in the middle on a speed dimmer to control it.
Depending on the size of the incubator, just one or two computer fans would work great on the bottom in the center.
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