update......this doesn't seem to work to well in a large room even with only a few plants in it,due to the fact that it can't move alot of air.it can't even kill the vegging smell in my room where i have 28 plants.but worked great in my cabinet and closet where i was flowering and drying 4 plants.Of course it is possible that i need to change the carbon...it is about 6 or 7 months old.when i do that i will let you know if things improve.