I was thinking about buying one for myself, however, I hear two things about them. One, do not put it in the grow room itself, rather outside in a differant room. This is because it will take all the smell off the plant, and turn it into oderless weed. And two, they work, but are a pain to clean constantly. After all my research, I am going to buy
Amazon.com: Ionic Pro CA200T Twin Pack Compact Ionic Air Purifier with Bonus Car Ionizers: Home & Garden. Best bang/buck I have found, and you can even give the other one for a good christmas present.
Good luck,
Mr. Y