Atco 070-R4.2_7X25FT Insulated Flex Duct R-4.2 7in X 25ft

Product Description

The ATCO RUBBER PRODUCTS 070-R4.2_7X25FT is a Class 1 insulated flexible air duct designed for residential and commercial HVAC distribution systems. It measures 7 inches in diameter and comes in a 25-foot length, insulated with a thick blanket of fiberglass at R-4.2. The 2-ply polyester inner core is air-tight and smooth to minimize friction loss and prevent fiberglass erosion into the air stream. An encapsulated wire helix maintains shape and allows clean cuts without unraveling. The gray polyester outer jacket resists tearing and puncture. Rated for air velocity up to 5000 FPM and positive pressure up to 6 inches WG, this duct handles demanding airflow requirements without compromise. Licensed HVAC technicians and sheet metal contractors are the primary installers.

This flexible duct is suited for trunk-and-branch residential forced-air systems, light commercial HVAC layouts, and retrofit applications where rigid duct installation is impractical. It performs within a continuous temperature range of -20 to 180 degrees F and an intermittent range up to 250 degrees F, making it compatible with standard gas furnace, heat pump, and air handler supply runs. The plain-end termination fits standard collars and takeoffs used in typical residential and commercial ducted HVAC systems. Its compact carton format reduces handling requirements on the jobsite.

Key Features

• R-4.2 thick blanket fiberglass insulation for energy-efficient thermal performance
• Air-tight 2-ply polyester smooth inner core eliminates fiberglass erosion into the air stream and reduces friction loss
• Encapsulated wire helix holds shape and prevents unraveling when cut to length
• Gray polyester outer jacket provides tear and puncture resistance with low maintenance requirements
• Rated to 5000 FPM air velocity and 6 inches WG positive pressure per UL 181
• Wide temperature range: -20 to 180 degrees F continuous, up to 250 degrees F intermittent

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for Class 1 ducted HVAC supply and return air applications meeting UL 181, NFPA 90A and 90B, IMC, IRC, UMC 10-1, HUD, and ASTM C-158 requirements.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with NFPA 90A, NFPA 90B, and the applicable mechanical code (IMC or UMC). Power down the air handler or furnace and close the system isolation point before connecting or disconnecting duct sections. Flexible duct should be supported at manufacturer-recommended intervals to prevent sagging, which increases static pressure loss. Do not compress or over-bend the duct, as excessive bends reduce airflow efficiency and can damage the inner core.

Technical Specifications

• Diameter: 7 inches
• Length: 25 feet
• Insulation Type: Thick Blanket Fiberglass
• R-Value: R-4.2
• Air Velocity Rating: 5000 FPM
• Rated Positive Pressure: 6 inches WG per UL 181
• Rated Negative Pressure: 3/4 inch WG per UL 181
• Temperature Rating (Continuous): -20 to 180 degrees F
• Temperature Rating (Intermittent): -20 to 250 degrees F
• Inner Core Material: 2-Ply Polyester
• Jacket Material: Gray Polyester
• Duct Type: Class 1, Insulated, Flexible, Plain End
• Flame Spread (Maximum): 25
• Smoke Developed (Maximum): 50
• Applicable Standards: UL 181, NFPA 90A and 90B, IMC, IRC, UMC 10-1, HUD, ASTM C-158

Standard Information

• Brand: ATCO RUBBER PRODUCTS
• Manufacturer Part Number: 070-R4.2_7X25FT