OEM Lennox 7-Burner Inshot Burner Assembly — 18L59

The genuine OEM Lennox 18L59 inshot burner assembly (factory number 619796-07) is a complete 7-burner rack that delivers gas to the heat exchanger and supplies the flame for combustion in compatible Lennox gas furnaces. Each inshot burner shapes and directs its flame into the heat-exchanger tube, allowing the ignitor to establish and the flame sensor to prove ignition on every heat call. Installing the correct factory assembly maintains proper flame geometry, safe combustion, and reliable high-capacity furnace operation.

Common failure symptoms: When burners corrode, warp, or fill with rust and scale, you may see delayed ignition, flame rollout, rumbling or popping noises, yellow or lazy flames, short cycling, or lockouts from failed flame sense. Clogged or cracked ports can also cause soot and incomplete combustion.

Why OEM matters: Lennox builds the 18L59 to exact port dimensions, spacing, and gas-orifice alignment for its larger 7-burner furnace models. Aftermarket burners can alter flame characteristics and compromise safe, efficient heating. The factory-specified assembly guarantees correct fit, rated BTU input, and dependable ignition for the life of your Lennox system.