200mm to 120mm (NF-A20 for Digitus Unique) fanduct

I designed this duct, because I needed more air ventilation in my Digitus Unique rack, while also being as quiet as possible. So I landed on Noctua NF-A20 for cooling, since those can produce a lot of airflow while remaining quiet.

Since the rack however only has mounting holes for 120mm fans, I created a duct to make it work.
Printed in PETG, just to be sure, in case the temperature in the rack gets too high, and I am using M5 screws and Nuts.

Technically the nuts are not needed, since the holes are just tight enough when printed so the screws can tap the plastic, but I wanted them in there for extra insurance. They might hold well enough when just pressed into their respective holes, like I did, or just glue them in with a drop of super glue.