Lennox 59L20 Gasket

When you're dealing with a pressure switch trip or noticing moisture streaks around the inducer, the Lennox 59L20 Collector Box Gasket (also identified as LB-91846) is the critical seal required to restore atmospheric integrity. This genuine OEM Lennox replacement part is engineered specifically to provide a high-temp, airtight interface between the collector box and the blower housing. A degraded gasket in this high-stress zone often leads to flue gas leakage or vacuum loss, which triggers safety lockouts. Veteran techs know that re-using an old compressed seal on a Lennox gas furnace is a recipe for a callback; this HVAC collector box gasket ensures a professional-grade fit on popular units like the LGC series. Designed for durability against corrosive condensate, it maintains the precise static pressure needed for the furnace inducer motor to operate within its technical parameters, preventing unwanted air infiltration and ensuring peak system efficiency.

Key Benefits for the Contractor:

• Precise OEM Fit: Eliminates the guesswork and "make-it-fit" trimming required with universal seals, ensuring a leak-proof collector box connection.
• System Efficiency: Restores the intended pressure differential, preventing furnace pressure switch errors and intermittent ignition failures.
• Material Integrity: Constructed from high-grade elastomers to resist the acidic nature of furnace condensate and high-temperature operational cycles.
• Direct Compatibility: Specifically designed for Lennox HVAC equipment, including LGC060S2 and LGC072S2 models, ensuring seamless integration with inducer blower assemblies.

Common Questions:

• Can I use RTV silicone instead of the 59L20 gasket? While RTV might provide a temporary seal, it often lacks the consistency and specific thickness required for the collector box's pressure requirements. Using the 59L20 gasket is the only way to ensure the unit meets factory specs.
• Why did my original collector box gasket fail? Over time, the constant thermal expansion and exposure to acidic condensate can cause the material to become brittle or "pancake," losing its ability to maintain a vacuum seal.
• Will this fix a furnace water leak? If you see water dripping from the bottom of the collector box or inducer housing, a compromised collector box gasket is a primary suspect and should be replaced during your diagnostic.

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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.