Direct oxidizers use a burner to preheat the incoming process air prior to entering the combustion chamber. The burner will provide enough energy to heat the process air to the combustion chamber temperature of ~1,400°F. In the combustion chamber, the VOCs within the process exhaust will convert to CO2 and H2O. This 1,400°F air, now clean, will exhaust to the atmosphere. Direct thermal oxidizers can be designed in a vertical position or horizontal. Raw gas burners are common to reduce the overall energy consumption. A direct thermal oxidizer can be a low-cost solution for many applications.