Actually this is the one I use for the 4 turner tablo. Put the tablo on one with the fan blowing up, the other on top of the tablo so the wind blows through it.
2PACK 120mm USB Quiet Fan with 3 Speed Controller for AV Receiver Wi-Fi Router
This link - https://www.amazon.com/Antec-120mm-Performance-Connector-P12/dp/B0824MJR3T shows a 5 pack with a 3-pin header or a single with a 3-pin header or a single with a 4-pin header.
I misunderstood
to be fans which plugged into an USB port 
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