Just a stupid answer. Ona gel.Get some Alaska Fish Fertilizer. It won't stop your plants from smelling skunky but it will mask the smell quite well. Just pour some concentrate around your grow room door and trust me, the last thing people are going to think is weed. Dead cat or diarrhea bag they might say, but they will never think weed. Otherwise your going to have to go with ducting and a charcoal filter I'm afraid.
BC's Finest
http://www.amazon.com/ONA-Liquid-Concentrate-1-Quart/dp/B000BS4Y6W/ref=sr_1_7?s=home-garden&ie=UTF8&qid=1310566049&sr=1-7Search eBay , 1 gallon pro version of the gel. Separate into two and 1 in room , other in grow . He's had no problems in years and the gel last quite a while
This is true with the fragrance Onasi just ordered some ona gel pro from amazon. well see how this works.from what ive read it shouldnt be used inside the actual grow area because of horror stories of peoples bud absorbing the ona smell and affecting the taste.
Mind putting up a link so I can get the same one?the ona pro gel i got today doesnt really smell like anything.
did that, worked for a few days then completley lost its scent due to the fan constantly runningWell I would try it this way before saying it sucks - http://www.thcfarmer.com/forums/growfaq/growfaq/pdf/(2007) DIY Odor Removing Machine - Videoman.pdf