This 3D Model can get used add a 12cm silent fan vent exhaust to the Prusa XL exhaust cover.
It fits perfectly into any printer encasement wall (may it be cardboard, metall or plexiglass) and has a fan + a box for the active carbon filter. Whereas the filter can be either activated carbon pallets (with an additional filter) or "foam" (my preference - which is explained in the attached PDF).
The filter itself can easily be exchanged as it is kept inside via a magnet lock.
=== Addendum:
Attention:
The author remixed this model.
This is an addition to the Prusa XL exhaust cover. In the end the air needs to be cleaned…