Hart Cooley 51331 F216 R-6 Insulated Flexible Duct 14 Inches X 25 Feet

Product Description

The Hart Cooley 51331 is a 14-inch diameter, 25-foot insulated flexible duct designed for HVAC air distribution systems. It is built for professional installation in residential and light commercial applications where reliable airflow and thermal performance are required. HVAC technicians use this type of flexible duct to connect air handlers, plenums, and branch runs to supply registers and grilles in both new construction and retrofit work. The 51331 features an R-6.0 insulation rating, which meets or exceeds common energy code requirements across most U.S. jurisdictions. The insulation is formaldehyde free, making it a safer choice for occupied buildings and indoor air quality compliance. The outer jacket is a metalized polyester film reinforced with a fiberglass scrim layer. This construction resists puncture, moisture, and everyday job-site handling. Beneath the jacket, the core is built from a double-ply black polyester material. The double-ply design adds strength and helps the duct hold its shape through bends and connections. This duct is UL listed, confirming it has been independently tested and meets recognized safety standards for air handling systems. It arrives boxed, which protects the product during shipping and storage on the job site. The 14-inch diameter is a larger duct size typically found in main trunk runs or high-volume branch applications in commercial-grade residential systems. At 25 feet per box, installers get a workable length for longer runs without the need for additional couplings. Proper support spacing and sealing at all connections with mastic or UL-listed tape are standard installation requirements for this product type. This duct is also referenced under the F216 product series from Hart Cooley.

• R-6.0 formaldehyde free insulation meets energy code requirements for residential and commercial HVAC installations
• Metalized polyester outer jacket reinforced with fiberglass scrim for durability and moisture resistance
• Double-ply black polyester core provides added strength and shape retention through bends and fittings

Product Highlights

The Hart Cooley 51331 delivers R-6.0 thermal performance in a durable, UL listed flexible duct format suited for professional HVAC air distribution work. Its 14-inch diameter and 25-foot length make it well matched for high-volume trunk and branch run applications.

Product Information

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 51331

Technical Specifications

• Diameter: 14 inches
• Length: 25 feet
• Insulation Rating: 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