Hart Cooley 51042 F214 Insulated Flexible Air Duct Class 1 12 Inches X 25 Feet

Product Description

The Hart Cooley 51042 is an insulated flexible air duct built for residential and commercial HVAC installations where reliable airflow and thermal efficiency are required. Part of the F214 series, this duct measures 12 inches in inside diameter and comes in a 25-foot length, making it well suited for main trunk connections, branch runs, and supply or return air applications in forced-air systems. The duct is rated Class 1, which meets standard building code and fire safety requirements for flexible ductwork used in air distribution systems. HVAC technicians and mechanical contractors rely on Class 1 flex duct for a wide range of ducted heating and cooling projects, including new construction, retrofits, and equipment replacements. The inner core is constructed from polyester, while the outer jacket uses metalized polyester to reflect heat and protect the insulation layer. The insulation carries an R4.2 value, providing a solid thermal barrier that helps reduce energy loss as conditioned air travels from the air handler or furnace to supply registers throughout the building. This level of insulation is commonly specified in energy codes and ACCA Manual D duct design guidelines. The duct handles airflow up to 5000 feet per minute, supporting high-velocity systems and larger air handler configurations. Its pressure rating spans from -3/4 to 12 inches water column, giving installers confidence across a broad range of static pressure conditions. The operating temperature range runs from -20 to 140 degrees Fahrenheit, covering both heating and cooling seasons in virtually any climate. Vapor transmission is rated at 0.04 perm, minimizing moisture migration through the duct wall and reducing the risk of condensation-related issues inside wall cavities or attic spaces. This product is domestically made.

• 12-inch inside diameter and 25-foot length for large trunk and branch duct runs
• R4.2 insulation with metalized polyester jacket for thermal efficiency and vapor control
• Class 1 rated with a 5000 fpm airflow capacity and -3/4 to 12 inches WC pressure rating

Product Highlights

The Hart Cooley 51042 F214 flexible air duct delivers Class 1 performance with strong insulation and a wide operating range, making it a dependable choice for HVAC professionals handling ducted air distribution in residential and light commercial systems.

Product Information

Standard Information

• Brand: HART COOLEY
• Manufacturer Part Number: 51042

Technical Specifications

• Series: F214
• Type: Insulated Class 1
• Inside Diameter: 12 inches
• Length: 25 feet
• Material: Polyester and Metalized Polyester
• Insulation Value: R4.2
• Flow Rate: 5000 fpm
• Pressure Rating: -3/4 to 12 inches WC
• Temperature Rating: -20 to 140 degrees F
• Vapor Transmission: 0.04 perm
• Domestic/Import: Domestic