The Lennox 12Y77 Heat Exchanger Assembly (OEM part number 614580-01) is a genuine Lennox replacement component engineered for safe and efficient operation in compatible Lennox gas furnaces. As the core component responsible for transferring heat from combustion gases to the airflow, this heat exchanger is manufactured to precise factory specifications to ensure proper thermal performance and long-term reliability.

Designed as a direct OEM replacement, the Lennox 12Y77 restores original furnace performance while maintaining manufacturer safety standards. It is built for durability under high-temperature operating conditions and helps prevent issues such as heat loss, inefficient heating, or unsafe combustion gas leakage caused by worn or cracked heat exchangers. This assembly is ideal for professional HVAC service replacements where OEM fit, performance, and compliance are required.

This part has an extensive replacement history, consolidating multiple older Lennox heat exchanger assemblies into a single current solution. Using the latest revision ensures compatibility improvements and updated manufacturing standards compared to earlier versions.

Key details
Brand: Lennox
Catalog Number: 12Y77
OEM Part Number: 614580-01
UPC: 66255149559
Unit of Measure: Each
Gross Weight: 39 lb
Type: OEM Heat Exchanger Assembly

Replacement history
Latest: 12Y77
Replaces: 98W36, 75W33, 75W35, 10A65, 612983-41, 612219-11, 614580-01, 605996-87, 605996-55, 605996-28, 605996-26

The Lennox 12Y77 heat exchanger assembly is recommended for OEM furnace repairs where safety, efficiency, and exact fit are critical. Suitable for residential and light commercial HVAC applications using compatible Lennox furnace models.