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A few months ago, I did a post about my plan to upgrade my server rack. A user with the sweet sounding name of @dauerstaender requested a follow up, so here we are.

Open bottom and fans

As mentioned in the original post, a huge point was the open bottom. Together with my pops, I made a piece of plywood to seal off the hole and to mount four 120mm fans with dust filters.

![Open bottom][1]

![Plywood board][2]

![Plywood board in server rack][3]

![Plywood board in server rack with fans][4]

I used Noctua's NF-P12 redux-1300 PWM fans. They are dead silent on medium-low speed, support PWM signals between 0.0 (off) and 1.0 (full speed), have Noctua's high quality standards, and are quite affordable for a 4-pin PWM fan with roughly 14.50 € (15.88$) each.

The two holes in the back are for in and outgoing cables but as there are only a couple of cables that have to be l