your better/ safer using a carbon filter and then may be getting some ONA in the room to help a bit. if smell is a problem then get somthing like car body filler or contact adhesive in cups around the grow room that stuff will over power the smell of weed your house will smell like a garage, but cannabis will not be smelt.Anyone have any expierence with ONA products? WHich are the best? Gel, Mist? any input would greatly appreciated...