Gas Phase Filtration is one type of air cleaning technology that is used for the collection and destruction of contaminants in air. A gas phase filtration system is designed to provide a surface for physical adsorption of a contaminant compound and the catalytic decomposition or oxidation of the compound into less a hazardous or innocuous substance. A gas phase filtration equipment include granular activated carbon filters or filters containing a mixture of activated carbon and an oxidizing agent such as potassium permanganate & electronic air cleaners that utilize high voltages to produce ions or ozone to carry out reactions with gas phase pollutants. Gas-phase filtration systems are classified as cell systems for lighter gas concentrations and deep bed systems for heavier concentrations. Each system contains pre- and post particulate filters and various bed depths of media such as potassium permanganate spheres (KMnO4), virgin or activated carbon granules.