Remix of another cover, but made for a bigger fan 80x80x25 since they are more silent than the slim fan.
This will require you to raise the printer.
I made these legs for my Ender 3 v2.
https://makerworld.com/en/models/473595
I also made a fan cover for the Mainboard:
https://makerworld.com/en/models/473617
The fan I used was the Arctic F8:
https://www.amazon.com/ARCTIC-Silent-Ultra-Quiet-inaudible-Configuration/dp/B0119SLG18/
but any 80x80x25 will work :)