Maybe it could be pre-filtered air in a closed loop? However, this already seems like magic to me, so I am unsure if it is possible to filter/recycle the air an

Maybe it could be pre-filtered air in a closed loop? However, this already seems like magic to me, so I am unsure if it is possible to filter/recycle the air and still come out net energy positive. Alternatively, maybe there could be some kind of washing step where the plates are washed/air forced through/voltage applied to remove debris.