Lennox 34M35 Evaporator Coil

The Lennox 34M35 Evaporator Coil is a high-performance uncased evaporator coil designed for versatile integration within split-system air conditioning and heat pump applications. Also identified by the manufacturer as 34M3501 or LB-88761D, this 3.5 to 4-ton cooling capacity component is engineered for upflow configurations. Featuring advanced copper tube construction, the unit maximizes heat transfer and moisture removal to ensure the refrigeration cycle operates at peak thermal efficiency. As an OEM Lennox replacement part, it provides a direct physical match for CBX27UH and CBX32MV series air handlers, maintaining the original system's pressure drop specifications and SEER2 ratings without the need for extensive field modifications.

For veteran technicians, the 34M35 is the standard for reliable indoor coil replacement in residential and light commercial settings. The factory-installed TXV (Thermal Expansion Valve) is calibrated for R-410A refrigerant, ensuring precise flow control and preventing evaporator coil freezing under varying load conditions. Weighing 68 lbs, this Lennox 3.5 ton coil is built with a durable drain pan capable of withstanding high service temperatures, making it a robust choice when pairing with gas or oil-fired furnaces. Utilizing genuine Lennox HVAC parts like the 34M3501 ensures long-term HVAC system compatibility and prevents the performance degradation often associated with generic aftermarket alternatives.

• Direct OEM Compatibility: Built to exact specifications for Lennox CBX27UH-042/048 and CBX32MV-048 models, ensuring a seamless drop-in fit.
• High-Efficiency Heat Transfer: Optimized copper tube and aluminum fin design facilitates superior heat and moisture absorption for consistent climate control.
• R-410A Optimized: Includes a factory-installed, non-bleed expansion valve (TXV) specifically engineered for high-pressure HFC-410A refrigerant systems.
• Uncased Versatility: The uncased design allows for flexible installation within existing plenums, making it ideal for furnace coil upgrades and tight mechanical spaces.
• Industrial Build Quality: Rigorously tested to withstand the rigors of continuous operation in both residential and commercial split-system air conditioners.

Is the Lennox 34M35 compatible with my existing furnace?
Yes, as an uncased evaporator coil, the 34M35 is designed to be paired with various Lennox air handlers and furnaces. It specifically matches 21-inch and 24.5-inch cabinet widths (C and D sizes). Always verify the nominal cooling capacity (3.5 - 4 Ton) matches your outdoor condenser to ensure proper system balance.

What is the difference between 34M35 and 34M3501?
These part numbers are identical. 34M35 is the common ordering SKU, while 34M3501 is often used in internal manufacturing and cataloging. Both represent the same Lennox LB-88761D assembly.

Why should I choose an OEM Lennox coil over an aftermarket alternative?
Using a genuine Lennox 34M35 indoor coil preserves the engineered airflow (CFM) and static pressure requirements of your HVAC system. Aftermarket coils may have different fin densities or circuitry, which can lead to improper refrigerant charging and reduced system longevity.

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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.