harddon and zandor -- thanks for chiming in....
i'm growing in a basement -- a fairly large room. but it's the basement, and well, that smell rises. harddon -- i think your setup is ventilating a small grow room, correct? so you need intake on one side, exhaust on the other.

since i'm in this large space, i guess i need to simply exhaust the stink through an old dyrer vent (the squirrel cage fan would work for that). search ebay for it and you'll see what i mean. doing so would naturally draw clean air in (it hardly an airtight space).

zandor, what you're doing intrigues me. if what you're saying is correct (and i'm guessing a "fart fan" is a bathroom exhaust fan?), you just run that fan near the grow, with the filter somehow attached to the fan, and that removes the odors. that would be great. could you either explain exactly how you do it +/or if you have pics, that'd be great.
thanks again for both postings.
booch