Direct Fired Thermal Oxidizer. How does a Direct Fired Thermal Oxidizer (DFTO) breakdown air pollution and remove emissions from process air? Epcon is an industry leader in Direct Fired Thermal Oxidizer (DFTO) control equipment technology specializing in custom modular units for stationary sources as well as trailer-mounted applications for the field and temporary solutions. Epcon is pleased to offer different purchase, lease, and rental agreement options to suit any need. Direct Fired Thermal Oxidizers are ideal solutions for high solvent loading and fluctuating operating conditions.