hey 4tatude i got a 8" eco plus fan with a 8" carbon filter. i didn't need one that big could of gone with the 6" but honestly why f*** around? i supersized! thing works beautifully and i got no odor issues. now my vegger thats another story lol. i got to get a 4" carbon filter for that room.dirk what are you using for odour controll, n does it totally eliminare or mostly.? im soon to be setting up a larger space and will need total controll if possable. looking at options