Atco 031-R8_7X50FT Flexible Air Duct R8 7in X 50ft

Product Description

The ATCO RUBBER PRODUCTS 031-R8_7X50FT is a Class 1 insulated flexible air duct designed for residential and commercial HVAC distribution systems. It features a 2-ply polyester inner core, a thick blanket of fiberglass insulation rated at R8, and a silver metalized polyester outer jacket. The duct is rated for air velocities up to 5000 FPM and handles positive static pressure up to 6 inches WG per UL-181. The encapsulated wire helix prevents unraveling when the duct is cut to length, and the smooth inner core reduces friction loss for lower operating costs. HVAC technicians and sheet metal contractors install this duct in forced-air supply and return systems.

This flexible duct is suited for residential and light commercial HVAC applications where a pre-insulated, ready-to-install solution is needed. The 7-inch diameter and 50-foot length make it appropriate for main branch runs and longer lateral runs off a plenum or trunk line. The metalized polyester jacket resists tearing and puncture during installation and routine service. It meets UL 181, NFPA 90A and 90B, IMC, IRC, UMC 10-1, HUD, and ASTM C-518 standards, making it code-acceptable across most jurisdictions that reference these model codes.

Key Features

• R8 thick blanket fiberglass insulation for high thermal efficiency and reduced heat gain or loss
• Air-tight 2-ply polyester inner core eliminates fiberglass erosion into the air stream
• Encapsulated wire helix holds shape when cut, allowing quick field sizing without unraveling
• Smooth inner core lowers friction loss and reduces system operating costs
• Tough metalized polyester jacket resists tearing and puncture for low maintenance in service
• Rated to 6 inches WG positive and 1 inch WG negative pressure per UL-181

Compatibility

Designed as an OEM-style replacement or new-installation flexible duct for residential and commercial forced-air HVAC systems requiring a 7-inch diameter, R8-insulated, Class 1 flexible air duct per UL 181.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with IMC, IRC, or the locally adopted mechanical code. Power down and lock out the air handling unit before making duct connections. Secure each end with an approved UL 181B-listed draw band or metal clamp and seal with listed mastic or foil tape rated for flexible duct applications. Avoid sharp bends that reduce the inner diameter, and support the duct at intervals specified by the applicable mechanical code to prevent sagging.

Technical Specifications

• Diameter: 7 inches
• Length: 50 feet
• Insulation Type: Thick Blanket Fiberglass
• Insulation R-Value: R8
• Core Material: 2-Ply Polyester
• Jacket Material: Silver 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
• Flame Spread Index: 25 maximum
• Smoke Developed Index: 50 maximum
• Duct Type: Class 1, Insulated, Flexible, Plain End
• Applicable Standards: UL 181, NFPA 90A, NFPA 90B, IMC, IRC, UMC 10-1, HUD, ASTM C-518

Standard Information

• Brand: ATCO RUBBER PRODUCTS
• Manufacturer Part Number: 031-R8_7X50FT