I found a great starting point on Github for a 12V fan controller but meant for the inside of a computer: I bought an Arduino Nano (after smoking my Uno's voltage regulator) to do the PWM and serial output. I had a random 12V power supply laying around from some LED lights so 12V was done. To combat this I bought two 12V 3000RPM PWM fans. I ended up designing a 12V PWM fan controller for the task.
Since the rack is right next to my desk any fans would need to be quiet. After setting up my new network rack I quickly realized that without fans the rack gets concernedly hot with the doors and panels closed.
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