Another informative posti take it you are just starting out... the thing about growing is... it gets easier as time goes on and you arm yourself with lots of information and good equipment. I know carbon filters and fans cost a lot... im using a crappy one for my veg room right now but pay the extra money - get a good one - it could be the difference between your neighbours tipping you off to the police or not. I have a plug in ozone generator as well for supplemental scrubbing... its just background ozone ie less than 100mg/hr and its safe to be around - just plugs into my wall, id reccomend one of those - you can get them very cheap off ebay and they do the trick.
The plants can stink so bad that you should really get a good quality carbon filter to solve all your woes - hope i helpled