Lennox 12K48 Orifice

The Lennox 12K48 LP Burner Orifice is a critical component for maintaining precise manifold pressure in Lennox furnace LP conversion kits. Engineered with a specific drill size calibrated for Propane (Liquid Petroleum) applications, this brass burner orifice ensures the correct air-to-fuel ratio demanded by high-efficiency heating systems. Whether you are performing a seasonal tune-up or a full field conversion, using OEM Lennox replacement parts is essential for preventing soot accumulation, incomplete combustion, and flame rollout. This 0.031-inch diameter orifice (check specific model requirements) is designed to withstand high thermal stress while providing consistent flow rates. Compatible with various Lennox G-Series and EL-Series gas furnaces, the 12K48 ensures that the appliance meets its rated BTUH input when firing on propane. Techs should verify the manifold gas pressure matches the rating plate specifications after installation to ensure optimal heat exchanger longevity and safe operation.

Key Benefits for Technicians:

• Precision Machined Brass: Constructed for high-tolerance gas flow regulation and resistance to corrosion in harsh combustion environments.
• Direct OEM Fit: Ensures seamless compatibility with Lennox furnace manifolds without the need for manual drilling or reaming.
• Optimized Combustion: Specifically calibrated for LP gas conversion, helping to maintain legal CO levels and peak thermal efficiency.
• System Reliability: Minimizes burner noise and ensures stable flame patterns across all burner ports.

Common Questions:

Which Lennox furnace models are compatible with the 12K48 orifice?
This orifice is typically found in G24, G26, G32, and EL series units. Always verify the part number against your specific unit’s serial number and the Lennox LP conversion kit instructions.

What is the difference between this and a standard Natural Gas orifice?
The 12K48 LP orifice features a significantly smaller aperture than its natural gas counterpart to account for the higher BTU density of liquid propane at higher manifold pressures.

Do I need to replace the entire burner assembly?
No, if the burner tubes are in good condition, you only need to replace the individual burner orifices when converting fuel sources or replacing a clogged jet.

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.