Regenerative Thermal Oxidizers use ceramic beds to absorb heat from the exhaust gas and use the captured heat to preheat the incoming process gas stream. These streams are typically produced by processes requiring ventilation, such as paint booths, printing and paper mills. They are suited to applications with low VOC concentrations but high waste stream flow rates. This is due to their high thermal energy recovery. The basic operation of an RTO consists of passing a hot gas stream over a heat sink material in one direction and recovering that heat by passing a cold gas stream through that same heat sink material in an alternate cycle. They are used to destroy air toxics and Volatile Organic Compounds (VOCs) that are discharged in industrial process exhausts.