About this item Key function: filter odors and deodorization, keep optimal ventilation Superior Carbon Quality:Special imported activated carbon from Australia, with stronger adsorption capacity Unique Design:Insulating flange,cellular structure,galvanized steel mesh, Cone shaped internal base for optimum Insulating flange and base:Antiseptic performance excellent,high accuracy,prevent carbon leakage Application Range:indoor growing plants,hydroponic growth chamber ,bathroom,pets,smoking and so on