The Lennox 74W81 (103011-03) Gasket-Vest Panel is a factory-original replacement part designed to create a reliable seal between the vest panel and adjoining HVAC system components. This gasket is essential for preventing air bypass, improving system insulation, and maintaining overall unit efficiency.Key Specifications:

• Part Type: Gasket – Vest Panel
• OEM Part Numbers: 74W81 / 103011-03
• Material: High-density foam with thermal-resistant adhesive backing
• Dimensions: Approx. 24" x 4" (cut-to-fit application; verify compatibility with specific unit)
• Temperature Rating: Withstands up to 250°F (121°C)
• Function: Seals vest panel to reduce air leakage, vibration, and noise
• Compatibility: Fits select Lennox air handlers and furnace models (confirm model-specific fit)
• Installation: Peel-and-stick backing for easy installation

Applications:

• Ensures proper airflow control
• Enhances energy efficiency by eliminating bypass air leaks
• Maintains structural stability of panel assemblies under thermal cycling

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