OEM Lennox Gas Burner Assembly — 11M64
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The genuine OEM Lennox 11M64 gas burner box assembly (factory reference LB-66722) delivers metered fuel to the combustion chamber of your Lennox gas furnace, mixing gas and air for a stable, efficient flame that heats the heat exchanger. As a factory-engineered component, it is machined to the exact port spacing and gas orifice alignment your specific Lennox furnace was designed around, ensuring proper flame carryover across every burner.
Common failure symptoms: When a burner assembly is corroded, cracked, or fouled you may notice delayed or rough ignition, noticeable flame rollout, yellow or lazy flames instead of crisp blue, sooting, unusual burning odors, or the furnace repeatedly locking out on the flame-sensing safety circuit.
Why OEM matters: Combustion components are safety-critical. Aftermarket burners often differ in port geometry and material grade, which can cause uneven flame patterns, poor flame-sense signal, and dangerous incomplete combustion. Choosing the OEM Lennox 11M64 guarantees correct fit, rated BTU input, and the clean, quiet combustion your Lennox equipment was certified to deliver — protecting both efficiency and safe operation.
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