Currently I’ve built a pseudo air purifier by attaching five 20”x20”x1” air filters to a 20” box fan. This configuration is used as a cooling system for my rack. (Yes, my middle server is missing its backup power supply. Funding is limited but is on the list to purchase.)
What is everyone else using for cooling solutions?
These were a deal I got some years ago on Amazon. I paid maybe $200 each but they didn’t come with hard drives or a backup power supply. I’ve been adding parts to them every paycheck since.