This is a duct for the nvidia rtx pro 6000 server edition, compatible with 120mm fans. I tested with a noctua industrial

THIS IS FOR THE FRONT PART. Use https://www.printables.com/model/1429603-nvidia-rtx-pro-6000-server-edition-back-duct for the back

You will need some original way to attach it to the front, with zip ties or some heat resistant tape