Patented Turbo-Reversed-Air System or TRA, the major breakthrough that accounts for INTERburner's fuel economy. Inside each INTERburner, TRA stabilizes dynamic pressure while maintaining high static pressure. It creates the most uniform airflow at the combustion head and gives precise control for the most effective mixing of combustion air with the oil on the combustion head... accomplishing efficiency levels never before achieved. INTERburner's flame burns hotter and cleaner... requiring less fuel to heat you home.