It's just how my twisted mind works, anyone wants to keep such a smell down in that type of drying box would need a filter and these ones for the kitty litter would be a perfect size for a small PC fan sized hole.Could try better then a tree
The other option is the replacement carbon filters for the extractor above your cooker, you could cut that to size, double layer it, do whatever necessary.
I like thinking of cheap solutions that you can pick up at any hardware or pet store, for it means that you can end up saving some money and nobody is ever going to be suspicious of you buying these things no matter which country/state/city you live in.