OEM Lennox 5-Burner Inshot Burner Assembly — 18L57
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The genuine OEM Lennox 18L57 inshot burner assembly (factory number 619796-05) is a complete 5-burner rack that delivers gas to the heat exchanger and provides the flame for combustion in compatible Lennox gas furnaces. Each inshot burner directs its flame accurately into the heat-exchanger tube, letting the ignitor establish and the flame sensor prove combustion on every call for heat. The correct factory assembly preserves proper flame geometry, safe operation, and steady furnace output.
Common failure symptoms: Corroded, warped, or scale-clogged burners can produce delayed ignition, flame rollout, rumbling or popping noises, yellow or lazy flames, short cycling, or lockouts caused by failed flame sense. Cracked ports may also lead to soot and incomplete combustion.
Why OEM matters: Lennox manufactures the 18L57 to exact port dimensions, spacing, and orifice alignment for its specific 5-burner furnace models. Aftermarket parts can change flame characteristics and jeopardize safe, efficient heating. The factory-specified assembly guarantees correct fit, rated BTU input, and reliable ignition throughout the life of your Lennox furnace.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
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Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days