Lennox 14K75 heat exchanger assembly is a genuine OEM furnace replacement part engineered to restore safe, efficient heat transfer in compatible Lennox gas furnaces. Manufactured to strict factory specifications, this heat exchanger is designed to handle high operating temperatures while maintaining proper airflow and combustion efficiency, helping extend the service life of the furnace and ensure reliable heating performance.

This assembly replaces multiple previous Lennox part numbers, making it a direct-fit solution for service technicians handling legacy furnace repairs or upgrades. With heavy-duty construction and an OEM design, it meets original safety and performance standards required for residential and light commercial HVAC systems. Ideal for professional furnace repair and preventative maintenance where dependable operation and correct fitment are critical.

Brand: Lennox
Catalog Number: 14K75
Model / Part Number: 614580-52
Replaces (latest to oldest): 14K75, 10A47, 71W77, 612989-03, 614580-52, 612222-03, 605996-69, 605996-10
Application: Gas furnace heat exchanger replacement
Gross Weight: 66 lb
Unit of Measure: Each

This OEM Lennox heat exchanger assembly is recommended for contractors and technicians seeking factory-approved reliability, correct furnace compatibility, and long-term heating system performance.