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