Original oil and gas trade magazine vintage ad for AIR PREHEATER CORPORATION. Main office was located in New York City, NY. Ljungstrom 30-hour day, recover valuable BTUs that are normally dissipated up the stack. By putting this heat back to work, higher flame temperatures are generated, heat transfer rates increased. You can save one barrel of fuel in every five, stay on-stream months longer because slag is virtually eliminated. This unique 1959 old petroleum refinery process industry magazine advertisement would display beautifully matted and framed.