OEM Lennox Inshot Burner Assembly (7 Burner) — 18L56
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The genuine OEM Lennox 18L56 (factory number 619795-07) is a complete 7-port inshot burner assembly used in Lennox gas furnaces. These burners direct a metered air-gas mixture into the heat exchanger tubes, where they establish a stable, efficient flame for heating. Because it is a factory component, the 18L56 is engineered to the exact burner spacing, orifice alignment, and flame-carryover geometry your Lennox furnace was designed around.
Common failure symptoms: delayed or rough ignition, flame rollout, sooting or yellow-tipped flames, unusual burner noise, and short-cycling on the flame sensor. Rust, scale buildup, or a warped burner rack from years of thermal stress are typical reasons for replacement.
Why OEM matters: Lennox heat exchangers rely on precise burner-to-tube alignment for safe combustion and correct temperature rise. Aftermarket or mismatched burners can cause improper flame patterns, incomplete combustion, and premature heat exchanger damage. Installing the OEM 18L56 assembly ensures proper fit, rated efficiency, and safe operation for your Lennox equipment.
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
- Tracking number emailed upon shipment
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