This is a HORIZONTAL IN-LINE OXIDIZER/HEAT EXCHANGER assembly employed in air purification. The external components are made from carbon steel, while the internal components are stainless. Ceramic insulation is installed on the inside of the shell. The impure air enters and is preheated by the hot oxidized air prior to entering the chimney. Operation efficiencies are monitored to EPA regulations through sensors at the top of the stack. These units have been installed in Canada and USA.