The Lennox 13U52 Aluminum Heat Exchanger Assembly, with a 240,000 BTU capacity, is a durable replacement part engineered for select Lennox commercial HVAC systems. Constructed from high-grade aluminum, it efficiently transfers heat from combustion gases to the circulating air, ensuring consistent heating performance and energy efficiency. https://www.partshnc.com/13u52-lennox-heat-exchanger-assembly-aluminum-240-000btu