Lennox 25N82 – Unico UPC-04-3642, Insulated Return Air Duct, 18 Inch x 10 Foot, R4.2

 

Product description

The Lennox 25N82 insulated return air duct, Unico part number UPC-04-3642, is designed for use in Unico high-velocity HVAC systems where efficient, quiet return airflow is critical. This 18 inch diameter by 10 foot long insulated duct provides reliable air movement while minimizing heat loss, condensation, and sound transmission. With an R4.2 insulation rating, it helps maintain system efficiency and supports consistent indoor comfort in residential and light commercial installations.

Manufactured to meet Unico system specifications, this insulated return duct is flexible enough for easier routing through tight spaces while maintaining durability for long-term performance. It is ideal for new installations, system upgrades, or replacement of worn or damaged return air ducting in Unico small-duct HVAC applications.

 

Key features

• Genuine Unico insulated return air duct
• Lennox catalog number 25N82
• Unico part number UPC-04-3642
• Duct size: 18 inch diameter x 10 foot length
• R4.2 insulation for reduced heat loss and condensation
• Helps reduce airflow noise in high-velocity systems
• Flexible construction for easier installation
• Designed specifically for Unico HVAC systems

 

Applications

• Unico high-velocity HVAC systems
• Residential and light commercial installations
• Return air duct replacement or new system installations

 

This Unico insulated return air duct is a dependable solution for maintaining airflow efficiency, comfort, and noise control in Unico HVAC systems while meeting manufacturer performance requirements.