OEM Lennox Inshot Burner Assembly (4-Burner) 619795-04 — 18L53

The genuine OEM Lennox 18L53 is a complete four-burner inshot burner assembly (Lennox part 619795-04) built for four-cell Lennox gas furnaces. The assembly includes the pre-aligned inshot burners mounted to their support so the flames fire cleanly into each section of the heat exchanger with correct cross-lighting and carryover between burners.

Symptoms that point to a worn or fouled burner assembly include rough or delayed ignition, a lazy yellow or lifting flame, sooting, burner noise or rumble, short-cycling on the flame sensor, and rust or debris visible in the burner ports. Because inshot burners sit directly in the combustion path, corrosion and blockages develop over time and degrade both efficiency and reliability.

Installing the OEM 18L53 assembly matters because the burner count, port geometry, and spacing are matched to the manifold orifices and heat exchanger of your specific four-cell Lennox furnace. Generic burners can misalign the flame, cause incomplete combustion, and trigger nuisance lockouts or carbon monoxide concerns. The factory 18L53 restores the original firing pattern and keeps your Lennox furnace burning safely at rated efficiency.