Direct Fired Thermal Oxidizers with Multistage Heat Recovery for Resin Application Home Project No 36 Direct Fired Thermal Oxidizers with Multistage Heat Recovery for Resin Application​ The Challenge A Major Engineering Company approached Epcon for a large Oxidizer System with 25,000 – 35,000 SCFM Afterburner for their Continuous Cord Resin-Impregnating manufacturing plant.