I posted my do-it-yourself build in another portion of the forums after I made one myself. This thing basically sucks in air (or pushes it out depending on the orientation of the fan) and neutralizes the smell in the air. I have literally smoked in the same room as this thing and not smelled a thing but the scent of the O.N.A concentrate. The O.N.A stuff bonds with odor molecules and takes them out ninja style, as claimed by the manufacturer (except the ninja part but it's pretty much implied). http://forum.grasscity.com/do-yourself/728452-diy-ona-odor-control-bucket-cheap-easy.html