Description
The Lennox 71W29 is an OEM replacement collector box gasket engineered to maintain a proper airtight seal between the collector box and the heat exchanger on compatible Lennox furnaces. A correctly seated gasket is critical to safe furnace operation — it prevents flue gas and combustion byproducts from escaping into the surrounding equipment cabinet, protecting both system efficiency and indoor air quality.
Why Replace Your Collector Box Gasket?
Over time, heat cycling, vibration, and normal wear can cause the original gasket to crack, compress, or deteriorate. A compromised gasket can lead to flue gas leaks, reduced combustion efficiency, nuisance pressure switch trips, and potential safety hazards. Replacing the gasket with a genuine Lennox OEM part restores the factory seal and ensures reliable, safe furnace operation.
Key Features
- Genuine Lennox OEM replacement part (SKU: 71W29)
- Designed for precise fit on compatible Lennox furnace collector boxes
- Maintains an airtight seal to prevent flue gas bypass
- Helps prevent nuisance pressure switch faults caused by air leaks
- Manufactured to withstand high-temperature furnace operating conditions
- Supports proper draft and combustion efficiency
Installation Notes
When replacing the collector box gasket, inspect the mating surfaces of the collector box and heat exchanger for warping, corrosion, or debris before installing the new gasket. Always follow Lennox service documentation and applicable local codes. Installation should be performed by a qualified HVAC technician.
Compatibility
Refer to your Lennox equipment’s service manual or contact your distributor to confirm compatibility with your specific furnace model before ordering.
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