The Lennox 61M20 burner box bottom, part number LB-100712C, is a genuine OEM combustion component designed for select Lennox gas furnaces. This burner box bottom section forms the lower portion of the burner assembly, providing proper containment and support for the burners while ensuring safe and efficient combustion inside the furnace cabinet. Manufactured to Lennox factory specifications, this component ensures correct fitment, reliable performance, and long-term durability under high-temperature operating conditions.

Replacing a damaged, corroded, or heat-compromised burner box bottom is essential to maintain proper airflow, combustion stability, and overall furnace safety. The Lennox 61M20 burner box bottom is engineered for direct replacement, making it ideal for professional HVAC technicians performing repairs or preventive maintenance on compatible Lennox furnace models.

As an OEM Lennox part, this burner box bottom meets strict quality and performance standards and is recommended for restoring original furnace operation without modification.

 

Product Overview:

 

The Lennox 61M20 LB-100712C burner box bottom is used in gas furnace combustion assemblies to support burner alignment and safely enclose the combustion process. It helps maintain correct burner positioning, protects surrounding components from heat exposure, and contributes to efficient fuel ignition and combustion.

 

Specifications:

 

Manufacturer: Lennox
Part Number: 61M20
Catalog Number: LB-100712C
Component Type: Burner Box – Bottom Section
Application: Gas Furnace Combustion Assembly
OEM: Yes (Genuine Lennox Replacement Part)