I see PC purist complain about their cooling so much.

https://sh.itjust.works/post/56904751

Also, as a bonus, put a cheap 4-inch AC filter on that box fan.

Now you have:

  • Zero dust in your PC

  • Noise dampening

  • A high CFM air purifier, right in your room.

Get a 20x20x4" filter, and the fan will suck it right to itself. Don’t even need mounting materials.