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I've done a DIY Carbon scrubber; easy as pie. As less mess if you dont use fish charcoal; but air purifier carbon filters. Basically its a filter soaked in carbon. As for how its made; hundreds of thousands of ways! Depending on how safe you want to be; i just did a mesh circle around a 4-6" duct adaptor with a 6" cap, then wraped that in two layers of the filter; then taped the ends... done; worked.
Another way is to buy a pricey ass one.
Another is OZone. Im in debate about this. Its good; its bad. Ask one person and "Its no worse then cigs", ask another and "You die the day you use it". These too as i found out are DIY; for around $50 depending how thrifty you is. But this will actually neutralize the air by emiting O3 and electrically charged stuffs that attract dust and pollen too. I'd research this and lemme know what you discover
Carbon scrubber will deff work; just decide how big; what shape; ect that you want. You can even do a dual chamber with active carbon inbetween the two carbon filters... possibility is endless...