Abstract: A thermal oxidizer assembly is adapted for mounting onto a furnace, such that a heating chamber of the assembly is in direct flow-through communication with an interior of the furnace and defines a flow path for volatile organic compounds that are released from workpieces being processed within the furnace. A heating module is mounted within the heating chamber of the assembly and is located within the flow path to create turbulent flow therethrough. The assembly is configured to allow a natural draft to pull the volatile organic compounds from the furnace and through the flow path, and the heating module heats the volatile organic compounds, within the heating chamber, to a temperature necessary to destroy greater than approximately 99% of the volatile organic compounds. A flow rate of the volatile organic compounds being pulled along the flow path is, preferably, between approximately five and thirty standard cubic feet per minute.