Lennox 84K45 Heat Exchanger Assembly is a genuine OEM furnace replacement part engineered to restore safe and efficient heating performance in compatible Lennox gas furnaces. This heat exchanger is responsible for transferring heat from combustion gases to the indoor air stream while keeping exhaust gases safely separated, helping maintain proper airflow, heat output, and system safety.

Manufactured to original factory specifications, the Lennox 84K45 ensures correct fitment, long service life, and dependable operation when replacing a worn or damaged heat exchanger. It is commonly used in professional HVAC repairs and furnace rebuilds where OEM quality and reliability are critical. Designed for direct replacement, this assembly helps extend furnace lifespan and supports consistent heating performance in residential and light commercial applications.

Product details
Brand: Lennox
Catalog Number: 84K45
Model / Part Number: LB-91398A
Type: Heat Exchanger Assembly
Unit of Measure: Unit(s)
Gross Weight: 43 lb
EAN / UPC: 400213

Replacement history (newest to oldest):
84K45
43J46
30J77
LB-91398A
LB-65730E
LB-65730A

Beenimax notes
This is an authentic OEM Lennox heat exchanger supplied by Beenimax and intended for professional installation. Proper diagnosis and model compatibility verification are recommended prior to ordering. Buying genuine OEM parts helps ensure furnace safety, efficiency, and long-term reliability.