An air preheater is a heat exchanger that heats incoming air using waste heat from flue gases or other hot streams. By raising the air temperature before combustion or drying, it improves fuel efficiency, enhances system performance, and reduces energy consumption. Commonly used in boilers, furnaces, power plants, and industrial drying systems. https://www.unitedheatexchangers.com/heat-exchanger/Air-Preheater/