For my incubator I use the CPU fans that have a little switch to adjust the fan speed, most have three speed adjustments. I use a ac/dc adapter, model# SF-789, this adapter allows for two fans to be plugged in directly.
I took a few pictures for you, the fans cost around $6 and the adapters I purchased from Frys Electronics cost around $8. Of course you may use any style fan, most will plug right into the adapter.
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