Lennox 45L14 Orifice

The Lennox 45L14 LP Gas Burner Orifice is the direct performance-grade replacement for the legacy LB-94569 model, specifically engineered for liquid propane (LP) conversion and maintenance in Lennox heating units. Built from high-density brass to withstand the corrosive properties of constant gas exposure and thermal cycling, this component features a precision-drilled .055" orifice diameter. This exact sizing is critical for metering gas flow at the manifold to achieve the correct BTU output and flame stability required for safe combustion. The unit utilizes a standard 1/8-27 NPT thread, ensuring a gas-tight seal without the need for excessive torque, which can lead to manifold damage as any veteran technician knows.

When performing a natural gas to LP conversion or replacing a clogged burner tip, using a genuine Lennox 45L14 ensures the discharge coefficient matches factory specifications. This prevents common issues like "lazy flames," excessive carbon monoxide production, or soot accumulation caused by improper gas-to-air ratios. This part is verified for use in a wide range of Lennox commercial and residential equipment, including the high-capacity KGA300S4-1 and various LGH/LGC rooftop unit series.

• Direct OEM Replacement: Seamlessly replaces LB-94569 and 113693 parts without modification to the burner assembly.
• Precision Metering: The .055" diameter ensures accurate fuel delivery for efficient LP combustion cycles.
• Industrial Construction: Corrosion-resistant brass prevents orifice clogging and maintains thread integrity over the lifecycle of the burner.
• Standard Fitting: 1/8-27 NPT threading provides a universal fit across numerous Lennox manifold designs.

Is the 45L14 Orifice compatible with natural gas?
No, this orifice is sized specifically for Liquid Propane (LP). Installing a .055" orifice in a natural gas system will result in under-firing and improper burner operation.

Can I use Teflon tape on the 1/8-27 NPT threads?
It is standard practice to avoid Teflon tape on orifice threads to prevent debris from shearing off and clogging the .055" opening. Use a gas-rated pipe dope sparingly if a sealant is required by local code.

Does this fit Lennox rooftop units?
Yes, the 45L14 is a standard component for many Lennox LGH and LGC series rooftop units where LP conversion or maintenance is required.

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.