Lennox 46K18 Burner

The Lennox 46K18 Burner is a high-performance OEM furnace component engineered for precise combustion in residential and commercial heating systems. This natural gas in-shot burner, which is identical to part number 46K1801, features a 5-inch length and a 46,000 BTU input rating. Constructed from aluminized steel to withstand high thermal stress, the Lennox 46K18 ensures optimal fuel-to-air mixing for clean ignition. As a direct replacement for Lennox 39271B001 as well as various Armstrong, Ducane, and Allied Air units, it is a critical component for maintaining AFUE efficiency ratings. Field technicians often find this part in G24, G32, and GHR26 furnace series where reliable flame carryover and consistent burner port alignment are required for safe operation. Utilizing a genuine Lennox 46K1801 burner maintains the original equipment’s design specifications, preventing premature heat exchanger fatigue often caused by irregular flame patterns from generic alternatives.

Key Benefits

• Universal Compatibility: Serves as an exact OEM replacement burner for Lennox, Armstrong, and Ducane part numbers 46K18 and 46K1801.
• Optimized Combustion: Features an in-shot burner design to enhance heat distribution and maximize fuel efficiency across the heat exchanger.
• Heavy-Duty Construction: Manufactured with aluminized steel for superior resistance to oxidation and scaling under high-temperature conditions.
• Standardized Installation: 5-inch length and 1.75-inch inlet width provide a precise fit for standard gas manifolds in High-Efficiency Lennox furnaces.

Common Questions

Is the Lennox 46K18 the same as the 46K1801?
Yes, the 46K18 is identical to the 46K1801. These part numbers are interchangeable and represent the same technical specifications and performance characteristics.

What furnace models use the 46K18 in-shot burner?
This burner is commonly used in Lennox G24, G32, and GHR26 series, along with various residential furnaces from Armstrong and Ducane that require a 5-inch gas furnace burner.

How do I know if my burner needs to be replaced?
Technicians should inspect for rusted burner ports, delayed ignition, or uneven flame patterns. Replacing a fouled or corroded 46K18 burner restores proper heating system performance and safety.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.