Lennox 33M14 Heat Exchanger

The Lennox 33M14 Heat Exchanger is a heavy-duty high heat aluminum heat exchanger assembly engineered for reliable thermal transfer in 10-to-20-ton LGB120 and LGB240 series rooftop units. As a veteran-grade OEM replacement part (LB-101202G), it features 11 burner tubes designed to handle high-demand cycles without premature metal fatigue. The aluminized steel construction provides superior thermal conductivity and corrosion resistance compared to standard components, ensuring consistent manifold pressure and combustion efficiency. Designed as a direct drop-in for Lennox, Armstrong, and Ducane commercial systems, this assembly replaces legacy part numbers 16K86 and LB-68889B. When performing a swap, verify the burner alignment and inducer motor specs to maintain strict combustion tolerances. This 115 lb. unit is purpose-built for technicians who prioritize HVAC system longevity and peak seasonal performance in large-scale commercial applications.

• Compatible with Lennox LGB120 and LGB240 series commercial gas-fired rooftop units.
• Constructed from heavy-gauge aluminized steel for enhanced heat transfer and oxidation resistance.
• Features an 11-burner tube configuration optimized for uniform heating and high-output capacity.
• Reliable OEM replacement part for direct fitment on legacy Lennox and Allied brands.
• Minimizes operational issues through precise manufacturing tolerances and high-efficiency thermal exchange.

What model series is the Lennox 33M14 compatible with?
This assembly is specifically designed for the Lennox LGB120 through LGB240 high-heat models, and is also found in various Armstrong and Ducane commercial equipment.

Does this unit include the burner manifold?
The 33M14 is a primary heat exchanger assembly. Technicians should verify if additional gaskets or burner components are required based on the specific condition of the existing rooftop unit.

Why use aluminized steel instead of standard steel?
The aluminized finish is critical for high heat applications to prevent the rapid oxidation and scaling that typically occurs at the high temperatures required for commercial heating loads.

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.