Lennox 27M78 Flue Gasket Kit

The Lennox 27M78 Flue Gasket Kit is a critical OEM component designed to maintain an airtight seal between the flue pipe and the heating appliance. Also identified as Lennox 27M7801, this high-temperature resistant gasket kit is engineered to withstand the thermal stress and corrosive secondary heat exchanger environments typical of Lennox G40DF, G50DF, and G60DF series units. Proper sealing of the flue system is essential for preventing dangerous combustion gas leakage and ensuring the venting system operates at peak static pressure efficiency.

Veteran technicians know that a degraded furnace exhaust gasket can lead to pressure switch trips and moisture buildup within the vestibule. This replacement flue gasket provides a precision fit that eliminates "whistling" air leaks and prevents energy loss through the exhaust stream. By restoring the integrity of the flue connection, you ensure that the furnace maintains its rated AFUE performance while safeguarding against carbon monoxide infiltration. This kit includes all necessary high-grade sealing materials for a robust, professional-grade installation on Lennox residential furnaces.

Key Benefits

• Airtight Performance: High-temperature material prevents flue gas leakage and ensures consistent draft inducer operation.
• Direct OEM Match: Fully compatible with part numbers 27M78 and 27M7801 for seamless integration with G40, G50, and G60 series equipment.
• Durable Thermal Resistance: Engineered to endure extreme exhaust temperatures without hardening or cracking over time.
• System Efficiency: Minimizes heat loss and optimizes airflow, helping the unit maintain its designed energy efficiency levels.

Common Questions

Is the 27M78 identical to the 27M7801?
Yes, these part numbers are interchangeable. The Lennox 27M78 and 27M7801 refer to the same flue gasket kit technical specifications and fitment.

Which Lennox furnace models use this gasket?
This kit is primarily utilized in Lennox G40DF, G50DF, and G60DF series units. Always verify your specific model number on the rating plate before installation.

Why is my flue gasket leaking moisture?
In high-efficiency units, condensation can form in the flue. A worn exhaust gasket allows this acidic condensate to leak into the furnace cabinet, potentially causing corrosion of the inducer housing or electrical components.

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.