Flexduct 65SERIESBAG R8 Flex Air Duct 5 in X 25 Ft Black

Product Description

The FLEXDUCT 65SERIESBAG is a UV-inhibited fiberglass flexible air duct rated at R8 insulation value, designed for residential and light commercial HVAC distribution systems. Measuring 5 inches in diameter and 25 feet in length, this duct ships as a single bag unit and is engineered to reduce heat gain and heat loss across supply air runs. The fiberglass construction and R8 thermal resistance make it well suited for attic installations and other high-temperature or UV-exposed environments where lower R-value duct would lose efficiency. Licensed HVAC technicians and sheet metal contractors are the typical installers of this product.

This flexible duct is used in forced-air heating and cooling systems to connect branch takeoffs from a central plenum or trunk line to supply registers and diffusers. Its 5-inch diameter is commonly found in residential systems serving individual rooms or zones. The black outer jacket is UV inhibited, making it appropriate for installations in unconditioned attics, crawl spaces, or exposed mechanical areas where sunlight contact is a concern. The 25-foot continuous length reduces the number of connection points needed on longer runs.

Key Features

• R8 fiberglass insulation reduces thermal loss and heat gain on supply air runs
• UV-inhibited black outer jacket rated for attic and sun-exposed installations
• 5-inch diameter fits standard residential branch duct fittings and collars
• 25-foot length minimizes field splices on longer distribution runs
• Fiberglass construction provides a durable, flexible core for routing around obstructions

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC systems requiring a 5-inch diameter R8-rated supply branch duct.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down the air handling unit and close the system before making duct connections. Avoid sharp bends, compression, or excessive sag, as these conditions reduce airflow and effective R-value. Secure all connections with approved mechanical fasteners and UL-listed mastic or metal tape per code requirements.

Technical Specifications

• Diameter: 5 inches
• Length: 25 feet
• Insulation R-Value: R8
• Material: Fiberglass
• Outer Jacket Color: Black
• UV Inhibited: Yes
• Unit of Measure: Bag (25 ft roll)
• Category: Flex Duct

Standard Information

• Brand: FLEXDUCT
• Manufacturer Part Number: 65SERIESBAG