120x38mm server fan cover. Threaded for optional attachment.
You will need to use M4 screws
The fan i currently use is Delta tha1248be
Battery pack 2P3S variant (x6 18650) https://makerworld.com/en/models/487668
Battery pack 1P3S variant (x3 18650) https://makerworld.com/en/models/487623
Related projects:
Powerful 99w mega fan https://makerworld.com/en/models/487975 ← used here
Portable powerful mini fan https://makerworld.com/en/models/487618
LED spotlight attachment https://makerworld.com/en/models/487592
Car socket attachment https://makerworld.com/en/models/487588
x6 battery holder https://makerworld.com/en/models/487614
battery receptacle snap on https://makerworld.com/en/models/487605
Tools to make the building of the pack easier https://makerworld.com/en/models/487583