They gave an answer here: Open Letter to Snapmaker re: Air Purifier - #15 by SnapmakerSupport
I think it’s clear that Snapmaker does not believe that the filtered air is safe to be vented indoors. I understand that part of it is the complexity involved with the many different types of materials that will be used. But, their answer means to me that their filter doesn’t add any value to the equation.
Regarding the safety and health of the environment, it could very well be that using their filter, which will be full of chemicals and would constitute toxic waste, is (net) more harmful for the environment than just exhausting non-filtered air from the enclosure outdoors.
I have e-mailed to cancel my order for the filter.