I recentley found a cool oder control systen that kicks ass.It is called a Arm and hammer pet oder grabber it is a fan with a baking soda crystal activated carbon self inclosed system that I bought at drugmart for 10 bucks.You can also buy replacement filters on line real cheap.I hooked a vent hose underneath the unit with duct tape and dryer hose to my speaker box grow.To make it even better I taped one of one of those aquarium bag filters wit the activated carbon over the top of the exhaust.Fan is very quiet and effective for small grows.Replace the filter every 2 weeks and you are good to go.