Lennox CK40 (CK40UT-36B) is a 3 Ton uncased aluminum upflow evaporator coil engineered exclusively for R-454B refrigerant systems. Built with a factory-installed TXV, this coil delivers reliable metering control, improved efficiency, and enhanced system longevity for today’s higher-performance heat pump and air conditioning systems. Its uncased configuration allows flexible installation in tight vertical upflow applications, making it an excellent replacement choice for Lennox residential systems requiring R-454B dedicated components.

This model features all-aluminum construction for greater corrosion resistance, reduced refrigerant leaks, and longer service life compared to traditional copper-tube coils. Designed for compatibility with modern R-454B outdoor units, the CK40UT-36B ensures optimal heat transfer, stable performance, and dependable comfort for homeowners.

Contractors choose this coil for its reliability, efficient design, and smooth integration with Lennox R-454B systems. Ideal for new installations, replacements, and system upgrades requiring a 3 Ton R-454B dedicated upflow coil.

 

Key Features:

• 3 Ton dedicated R-454B evaporator coil
• Uncased vertical upflow design for flexible installation
• Factory-installed TXV for R-454B refrigerant
• All-aluminum coil construction for durability and corrosion resistance
• Enhanced refrigerant metering and system efficiency
• Ideal for Lennox R-454B air conditioners and heat pumps
• Designed for reliable residential comfort cooling performance

 

Specifications:

• Model: CK40 / CK40UT-36B
• Capacity: 3 Ton
• Refrigerant: R-454B dedicated
• Metering Device: Factory-installed TXV
• Configuration: Upflow, uncased
• Coil Material: All-aluminum
• Application: Residential HVAC systems