Atco 031-R8_6X50FT R8 Flexible Air Duct 6 Inch X 50 Foot

Product Description

The ATCO RUBBER PRODUCTS 031-R8_6X50FT is an R8-insulated, Class 1 flexible air duct designed for residential and light commercial HVAC distribution systems. Rated for air velocities up to 5000 FPM and a positive pressure of 6 inches WG per UL-181, this duct handles demanding supply and return applications. The inner core is a 2-ply polyester construction that is air-tight and smooth, reducing friction loss and preventing fiberglass erosion into the airstream. A thick blanket of fiberglass insulation delivers the R8 thermal performance, while a silver metalized polyester jacket provides tear and puncture resistance. Installed by licensed HVAC technicians on both new construction and retrofit projects.

This flexible duct is suited for residential forced-air heating and cooling systems as well as light commercial HVAC applications where Class 1 duct material is required by code. The 6-inch diameter and 50-foot length make it a standard choice for branch runs from plenum boxes to diffusers and grilles. The plain-end termination is compatible with standard sheet metal collars, boots, and duct connectors. Its lightweight, compact carton simplifies handling on jobsites and in warehouse storage, reducing labor time during rough-in and trim-out phases.

Key Features

• R8 thick blanket fiberglass insulation for energy-efficient thermal performance
• Air-tight 2-ply polyester inner core eliminates fiberglass erosion into the airstream
• Smooth inner core minimizes friction loss and reduces system operating cost
• Encapsulated wire helix prevents unraveling when cut, speeding installation
• Metalized polyester jacket is tear and puncture resistant for long service life
• Rated for continuous operation from -20 to 180 degrees F and intermittent use to 250 degrees F

Compatibility

Designed as a Class 1 OEM-style flexible air duct replacement or new-install component for residential and light commercial forced-air HVAC distribution systems requiring a 6-inch diameter, R8-insulated flexible duct meeting UL 181, NFPA 90A and 90B, IMC, IRC, and UMC 10-1 standards.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with NFPA 90A, NFPA 90B, IMC, and local mechanical codes. Shut down and de-energize the air handling unit before connecting or disconnecting any duct sections. Support the duct at intervals per manufacturer and code requirements to avoid excessive sag, which increases static pressure and reduces system efficiency. Avoid compressing or kinking the duct during routing, as either condition significantly degrades airflow and thermal performance.

Technical Specifications

• Diameter: 6 inches
• Length: 50 feet
• Insulation Type: Thick Blanket Fiberglass
• Insulation Rating: R8
• Core Material: 2-Ply Polyester
• Jacket Material: Metalized Polyester
• Maximum Air Velocity: 5000 FPM
• Rated Positive Pressure: 6 inches WG per UL-181
• Rated Negative Pressure: 1 inch WG per UL-181
• Temperature Rating (Continuous): -20 to 180 degrees F
• Temperature Rating (Intermittent): -20 to 250 degrees F
• Duct Type: Class 1, Insulated, Flexible, Plain End
• Maximum Flame Spread: 25
• Maximum Smoke Developed: 50
• Applicable Standards: UL 181, NFPA 90A and 90B, IMC, IRC, UMC 10-1, HUD, ASTM C-518

Standard Information

• Brand: ATCO RUBBER PRODUCTS
• Manufacturer Part Number: 031-R8_6X50FT