So I found this big old Compaq server and this had some powerful fans. I remembered that my tempts to make a soldering fume extractor failed because the fan wasn't powerful.
So I designed a grill composed of two parts and two feet that also claps the parts together with the fan.
All parts are a tight fit so there is no need for any additional parts like screws or any glue.
This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/2fk8Kmsh2A5