OEM Lennox Burner Box Cover (LB-100684D) — 61M31
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The Lennox 61M31 (factory number LB-100684D) is a genuine OEM burner box cover designed for compatible Lennox gas furnaces. This cover encloses the burner compartment, maintaining the sealed combustion environment, directing proper airflow to the burners, and containing the flame path for safe, efficient operation.
Common failure symptoms: A warped, rusted, or missing burner box cover can allow air leakage that disrupts the burner air-fuel ratio, leading to flame rollout, sooting, uneven combustion, and nuisance safety lockouts. Gaps around a damaged cover may also let combustion products escape the enclosure or trip flame-sensing and rollout switches.
Why OEM matters: The burner box cover is a safety-critical enclosure whose fit and gasketing directly affect combustion airflow and flame containment. The factory Lennox 61M31 is manufactured to the exact dimensions, mounting pattern, and heat rating of your furnace's burner box, guaranteeing a proper seal and correct airflow balance. Generic or improvised covers can compromise combustion safety and efficiency — the OEM part restores the enclosure to factory specification.
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