OEM Lennox Inshot Burner Assembly (3-Burner) 619795-03 — 18L52

The genuine OEM Lennox 18L52 is a complete three-burner inshot burner assembly (Lennox part 619795-03) designed for three-cell Lennox gas furnaces. It provides pre-aligned inshot burners on their support bracket so each flame enters the heat exchanger correctly, with reliable cross-lighting and proper flame carryover from burner to burner.

A burner assembly that is corroded, blocked, or worn typically causes delayed or noisy ignition, a yellow or lifting flame, soot buildup, reduced heat output, and repeated trips of the flame sensor or high-limit switch. Rust flakes, dust, and insect nests inside the burner ports are frequent causes of an unstable flame and nuisance furnace lockouts.

Choosing the OEM 18L52 matters because the three-burner layout, port sizing, and spacing are engineered to match the manifold orifices and heat exchanger of your specific Lennox model. A mismatched or generic burner set can distort the flame, cause incomplete combustion, and create safety issues. The factory 18L52 assembly restores the intended combustion pattern and keeps your Lennox furnace operating safely and at its rated efficiency.