Hey I went to Wal-Mart last night and was looking to get an air purifier. I came across a Febreeze activated carbon fan thing for $14. It plugs into a wall outlet. I put it right next to my exhaust of my grow box. I don't have much issues for smell right now, so it is hard to tell if it works good. 1 1/2 week of 12/12 so far... The activated carbon is supposed to last a month or so.

They also have a big sheet of activated carbon for bigger air purifiers for like $10. You can cut up a piece the size of the old one and replace with that.

Depending on how big of a grow op you got, you might want to look into that.

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