Flexduct 1660 Flex Air Duct R6 16 Inch 25 Foot

Product Description

The FLEXDUCT 1660 is a UV-inhibited fiberglass flexible air duct with R6 insulation, designed for residential and light commercial HVAC distribution systems. At 16 inches in diameter and 25 feet in length, it handles high-volume airflow runs from supply plenums to diffusers and grilles. The R6 insulation value reduces heat gain and loss across the duct run, supporting system efficiency. The black UV-inhibited outer jacket is rated for installations where the duct may be exposed to sunlight, such as attic or crawlspace runs. Licensed HVAC technicians and sheet metal contractors are the primary installers.

This flexible duct is suited for residential forced-air systems and light commercial air distribution applications. It is commonly used to connect branch runs from the supply plenum to ceiling or wall diffusers in new construction and retrofit projects. The 25-foot length accommodates longer branch runs without requiring mid-run connections. Its flexible core allows routing around structural obstructions in tight attic and crawlspace environments where rigid duct is impractical.

Key Features

• R6 fiberglass insulation reduces conductive heat transfer along the duct run
• UV-inhibited outer jacket rated for exposed installations in attics and crawlspaces
• 16-inch diameter supports high-volume branch and trunk supply runs
• 25-foot length minimizes mid-run connections and potential leak points
• Black outer jacket finish suited for low-light and concealed installation environments

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC supply distribution systems requiring a 16-inch diameter R6-insulated flex duct.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with ACCA Manual D and applicable local mechanical codes. Power down the air handler and close the system disconnect before beginning duct work. Avoid sharp bends that compress the inner liner, which increases static pressure and reduces airflow. Secure all connections with approved clamps and mastic or UL 181-rated tape — never use standard duct tape alone on flex duct joints.

Technical Specifications

• Diameter: 16 inches
• Length: 25 feet
• Insulation R-Value: R6
• Insulation Material: Fiberglass
• Outer Jacket: UV-inhibited black
• Package Dimension (L x W x H): 16.75 inches

Standard Information

• Brand: FLEXDUCT
• Manufacturer Part Number: 1660