Air Filter with 20cm Noctua Fan

I designed this air filter, with the Noctua NF-A20 5V in mind. But any Noctua NF-A20 fan should fit.

-1x Main box

-2x Cover

-2x Filter holder

For filter material I use 21x21cm furnace filter, but other filter materials should work too.

To customize the air filter the SolidWorks files are provided.