Lennox 79L55 Burner Orifice

The Lennox 79L55 is a precision-engineered #42 burner orifice designed to manage fuel delivery within high-efficiency gas furnaces. As a direct replacement for the Lennox 79L5501, this component is critical for maintaining the stoichiometric balance required for clean combustion. This #42 sizing is specifically calibrated to meter gas flow at the manifold, ensuring that the burner assembly receives the exact BTUs required for optimal thermal output and heat exchanger longevity.

For service technicians, the 79L55 burner orifice is a vital Lennox furnace replacement part when addressing issues such as poor ignition, resonance noise, or soot accumulation caused by incorrect gas-to-air ratios. This genuine OEM Lennox part ensures compatibility with various TUA series models and other residential heating units. Utilizing a high-quality gas furnace burner orifice prevents common manifold pressure fluctuations and protects the system from the inefficiencies typical of generic or improperly sized alternatives.

• Ensures precise combustion efficiency by maintaining a strictly regulated gas flow rate to the burner assembly.
• Directly replaces Lennox 79L5501 to restore original manufacturer specifications for fuel delivery.
• Helps eliminate furnace resonance and "booming" ignition caused by incorrect orifice sizing.
• High-tolerance #42 drill size construction provides consistent performance across various manifold pressures.

• How do I know if I need a #42 orifice for my Lennox furnace? This specific sizing is determined by the furnace's BTU rating and the type of gas used (Natural Gas vs. LP). Always verify the Lennox compatible models in the service manual to match the manifold requirement.
• Can a clogged orifice be cleaned instead of replaced? While cleaning may temporarily clear debris, surface damage to the precision-drilled 79L55 hole can disrupt the spray pattern. Techs replacing a Lennox burner orifice prefer a new component to ensure accurate gas metering.
• Is this part compatible with LP conversion kits? Standard orifices like the 79L55 are typically rated for natural gas. Always confirm the specific drill size required for propane applications, as LP usually requires a smaller orifice than a #42 burner orifice.

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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.