Hart Cooley 51326 R-6 Insulated Flexible Duct 7 Inches X 25 Feet

Product Description

The Hart Cooley 51326 is a 7-inch diameter, 25-foot insulated flexible duct designed for residential and commercial HVAC air distribution systems. This product is built for HVAC contractors, sheet metal installers, and mechanical technicians who need a reliable, code-compliant flex duct for supply and return air applications. The 51326 carries an R-6.0 insulation rating, making it suitable for use in unconditioned spaces such as attics, crawl spaces, and mechanical rooms where thermal performance is critical to system efficiency. R-6 flex duct helps reduce heat gain and heat loss as conditioned air travels from the air handler or furnace to the supply registers throughout the building. The outer jacket is constructed from a metalized polyester film reinforced with a fiberglass scrim layer. This laminated construction resists moisture, puncture, and tearing during installation and over the life of the system. The core is a double-ply black polyester design that provides a smooth interior surface to support adequate airflow and reduce pressure drop across the duct run. The insulation used in this product is formaldehyde free, which supports better indoor air quality standards and meets the requirements of sensitive building environments. The Hart Cooley 51326 is UL listed, confirming that it has been independently tested and certified to meet applicable safety and performance standards for flexible air duct products. It ships in a boxed format for easy handling and storage on the job site. HVAC professionals commonly use this type of insulated flex duct when connecting trunk lines to diffusers, grilles, or registers in residential new construction, light commercial work, and HVAC retrofit projects. Proper installation with approved duct clamps and mastic or foil tape ensures airtight connections and long-term system performance.

• R-6.0 formaldehyde free insulation rated for thermal performance in unconditioned spaces
• Metalized polyester outer jacket reinforced with fiberglass scrim for durability and moisture resistance
• Double-ply black polyester core for structural integrity and consistent airflow

Product Highlights

The Hart Cooley 51326 delivers UL-listed, R-6.0 insulated flexible duct in a 7-inch by 25-foot configuration built for professional HVAC installation in residential and commercial applications.

Product Information

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 51326

Technical Specifications

• Diameter: 7 inches
• Length: 25 feet
• Insulation R-Value: R-6.0
• Core Type: Double Ply Black Polyester
• Outer Jacket Material: Metalized Polyester with Fiberglass Scrim
• Application: HVAC
• Type: Venting
• Package: Boxed
• Certifications: UL Listed