OEM Lennox Burner Box Cover — 61M29 (LB-100684B)

The genuine OEM Lennox 61M29 burner box cover (also identified as LB-100684B) is the enclosure panel that seals and protects the burner assembly inside your Lennox gas furnace. It maintains the correct combustion air environment, shields the burners from drafts, and helps direct the flame and flue products cleanly into the heat exchanger for efficient, stable heating.

A damaged, warped, or corroded burner box cover can lead to erratic flame patterns, inconsistent ignition, whistling airflow around the burner compartment, or nuisance flame-sensor and safety lockouts. Rust-through or heat distortion on the cover compromises the sealed combustion path and should be addressed promptly to keep the furnace operating safely and efficiently.

Installing the OEM Lennox 61M29 cover ensures an exact fit to the original mounting points and the correct gauge steel and coating Lennox engineered for this furnace platform. Aftermarket substitutes frequently differ in dimensions or finish, causing alignment problems, air leaks, and accelerated corrosion. This factory-specified part restores proper protection and combustion sealing for reliable, long-term performance of your Lennox system.