Im of a different mind in that i prefer to rely on ozone generators for the majority of the odor control,i was using carbon filters then venting outdoors,i now vent dirty air straight into a space that is occupied soley by a UV Ozone generator,that space is then vented outside,this method allows much smell to occupy a very small space & to be instantly shock treated with a very small generator.
I bought very large generators not really knowing how to use them or the difference between them,UV generators are the way to go,they are the only generators that give a real grow room application rating,humidity levels seriously effect the other design generators (corona discharge) that are ran off static electricity,i have both types & the UV models blow away the Corona models even though the ratings are drasticly lower with the UV models.
As Gangagoddess rightly pointed out there are serious complications with ozone generators,you can burn the hell out of your entire crop in a half hour,damage so bad they will never come back,i learned this the hard way,what i also learned is this,if you have the time to figure out how to properly incorpotate them into your grow op you'll say fuk carbon filters.
These are the models i have in use & i cant say enough good things about them,you will not be able to grow enough skunk to overcome this generator if it is used in a venting situation,just be sure to buy a back up bulb when ordering & clean the bulb once a month.
UV PRO 550 Ozone Generator Mold AUTO DETAIL Cars House - eBay (item 290236993900 end time Jun-14-08 04:55:35 PDT)