As I had few old server fans available I decided to make fumes extractor from them in custom 3d printed case. I started with measuring of dimensions that fans had and started Fusion360 to draw a case.
After all sides have been printed I started with assembly.
And this is how it looks from above.
All in all it works well but is loud as you would expect it from 4 server fans, even on 8V DC. So next step is to do the same with 120mm case cooling fan which is silent.