Lennox 25U80 – Lennox CK40, CK40CT-36B, 3 Ton, TXV (R-454B), Cased Aluminum Upflow R-454B Dedicated Evaporator Coil.

Lennox 25U80 – CK40CT-36B is a high-efficiency, 3-ton cased aluminum upflow evaporator coil engineered for modern R-454B systems. Designed for reliability, long-term performance, and clean indoor air delivery, this coil is built from durable aluminum to resist corrosion and maintain consistent heat transfer across a wide range of operating conditions. With its factory-installed TXV for R-454B refrigerant, the CK40CT-36B ensures precise refrigerant flow control, improved system efficiency, and dependable comfort in residential and light commercial applications.

This Lennox dedicated R-454B evaporator coil is optimized for compatibility with Lennox heat pumps and air conditioners, helping HVAC technicians complete clean, code-compliant installations with minimal field adjustments. Its cased upflow configuration offers easy access for service and routine maintenance, while the rigid cabinet provides dependable protection for internal components. Ideal for R-454B conversions and new installs, the 25U80 coil helps unlock higher SEER2 performance, quieter operation, and improved humidity control.

Key Features
• 3 ton capacity for standard residential airflow ranges
• Dedicated R-454B TXV improves metering accuracy and overall efficiency
• All-aluminum coil design for superior durability and corrosion resistance
• Factory-built in a cased cabinet for simplified installation and service access
• Upflow configuration suitable for closets, basements, and mechanical rooms
• Seamless integration with Lennox R-454B outdoor units
• Supports improved comfort, humidity control, and long-term system reliability                                  Specifications