Lennox 25W71 Gasket
The Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high-efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision-engineered furnace collector box gasket (also indexed under 100742-01) ensures an airtight, negative-pressure environment required for the draft inducer motor to pull combustion products through the heat exchanger assembly effectively.
Constructed from high-grade, heat-resistant elastomers, the Lennox 25W71 is built to withstand the acidic condensate environment typical of 90%+ AFUE systems. Replacing this HVAC collector box seal during a secondary heat exchanger inspection prevents common furnace pressure switch errors and maintains the factory-spec static pressure required for optimal combustion. This is a direct-fit component, eliminating the need for RTV silicone workarounds that can fail under thermal cycling.
Key Benefits for the Contractor:- Direct OEM Fit: Exact replacement for Lennox 100742-01, ensuring bolt-hole alignment and proper compression across the collector box surface.
- Airtight Integrity: Eliminates air bypass and vacuum leaks that cause intermittent furnace firing issues and inducer motor strain.
- Chemical Resistance: Specialized material resists degradation from the mildly acidic condensate found in high-efficiency condensing furnaces.
- Precision Thickness: Engineered to provide the exact crush-wrap needed to seal the cover without warping the plastic collector box housing.
- How do I know if the 25W71 gasket is failing? Look for water staining or white "crusty" residue around the edges of the collector box cover, or if the unit is throwing a 3-flash pressure switch code.
- Is this compatible with the G61 or SLP98 series? Yes, this gasket fits a wide range of Lennox high-efficiency condensing furnaces; always verify the specific collector box part number in the service manual.
- Can I use high-temp silicone instead of the 25W71? While possible in emergencies, a physical gasket is required for a reliable, service-removable seal that meets OEM safety standards.
This item is not eligible for free shipping.
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.
Original: $19.87
-65%$19.87
$6.95Lennox 25W71 Gasket
The Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high-efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision-engineered furnace collector box gasket (also indexed under 100742-01) ensures an airtight, negative-pressure environment required for the draft inducer motor to pull combustion products through the heat exchanger assembly effectively.
Constructed from high-grade, heat-resistant elastomers, the Lennox 25W71 is built to withstand the acidic condensate environment typical of 90%+ AFUE systems. Replacing this HVAC collector box seal during a secondary heat exchanger inspection prevents common furnace pressure switch errors and maintains the factory-spec static pressure required for optimal combustion. This is a direct-fit component, eliminating the need for RTV silicone workarounds that can fail under thermal cycling.
Key Benefits for the Contractor:- Direct OEM Fit: Exact replacement for Lennox 100742-01, ensuring bolt-hole alignment and proper compression across the collector box surface.
- Airtight Integrity: Eliminates air bypass and vacuum leaks that cause intermittent furnace firing issues and inducer motor strain.
- Chemical Resistance: Specialized material resists degradation from the mildly acidic condensate found in high-efficiency condensing furnaces.
- Precision Thickness: Engineered to provide the exact crush-wrap needed to seal the cover without warping the plastic collector box housing.
- How do I know if the 25W71 gasket is failing? Look for water staining or white "crusty" residue around the edges of the collector box cover, or if the unit is throwing a 3-flash pressure switch code.
- Is this compatible with the G61 or SLP98 series? Yes, this gasket fits a wide range of Lennox high-efficiency condensing furnaces; always verify the specific collector box part number in the service manual.
- Can I use high-temp silicone instead of the 25W71? While possible in emergencies, a physical gasket is required for a reliable, service-removable seal that meets OEM safety standards.
This item is not eligible for free shipping.
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.
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Description
The Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high-efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision-engineered furnace collector box gasket (also indexed under 100742-01) ensures an airtight, negative-pressure environment required for the draft inducer motor to pull combustion products through the heat exchanger assembly effectively.
Constructed from high-grade, heat-resistant elastomers, the Lennox 25W71 is built to withstand the acidic condensate environment typical of 90%+ AFUE systems. Replacing this HVAC collector box seal during a secondary heat exchanger inspection prevents common furnace pressure switch errors and maintains the factory-spec static pressure required for optimal combustion. This is a direct-fit component, eliminating the need for RTV silicone workarounds that can fail under thermal cycling.
Key Benefits for the Contractor:- Direct OEM Fit: Exact replacement for Lennox 100742-01, ensuring bolt-hole alignment and proper compression across the collector box surface.
- Airtight Integrity: Eliminates air bypass and vacuum leaks that cause intermittent furnace firing issues and inducer motor strain.
- Chemical Resistance: Specialized material resists degradation from the mildly acidic condensate found in high-efficiency condensing furnaces.
- Precision Thickness: Engineered to provide the exact crush-wrap needed to seal the cover without warping the plastic collector box housing.
- How do I know if the 25W71 gasket is failing? Look for water staining or white "crusty" residue around the edges of the collector box cover, or if the unit is throwing a 3-flash pressure switch code.
- Is this compatible with the G61 or SLP98 series? Yes, this gasket fits a wide range of Lennox high-efficiency condensing furnaces; always verify the specific collector box part number in the service manual.
- Can I use high-temp silicone instead of the 25W71? While possible in emergencies, a physical gasket is required for a reliable, service-removable seal that meets OEM safety standards.
This item is not eligible for free shipping.
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.
