I made a pretty simple DIY carbon filter that I have running to a Vortex 460, and it does a good job at keeping odors in check. But also the room that it's in is almost completely sealed, which helps keep the smell located in one area, and what gets vented goes directly outside. I checked out your other thread (cabinet looks great, by the way) but I couldn't tell if you were venting outside, or just outside of the cabinet. If you're just venting into the room that the cabinet is in, you may want to think about using something to mask the odors in that room... which should take care of any telltale odors outside of the cabinet. Either that, or your activated carbon might need to be changed. I usually have to change mine about once every two years, depending on how long it's been in use. I'm considering buying a prefabricated one myself, as I'm hearing of people who use theirs for several years without the need to change the carbon.