Quietflex flex-r4-7bag Insulated Flex Duct 7in R4.2 25ft

Product Description

The QUIETFLEX flex-r4-7bag is a rip stop insulated flexible duct designed for residential and light commercial HVAC air distribution systems. Built on the 40 Series platform, it features a 7-inch inner diameter, a 25-foot length, and an R4.2 insulation value to reduce heat gain and loss across supply runs. The outer jacket is constructed from metalized polyester, with a fiberglass insulation layer and a polyester inner core. Rated for airflow up to 6,000 feet per minute, this duct handles high-velocity system demands. Licensed HVAC technicians and sheet metal contractors install this product as part of forced-air duct systems.

This flexible duct is suited for supply air branch runs in residential forced-air systems and light commercial applications where routing around framing, joists, or mechanical obstructions is required. The rip stop construction resists tearing during installation and handling. It is appropriate for attic, crawlspace, and interior ceiling plenum installations where a silver metalized finish and vapor barrier performance are required. The -20 to 180 degrees F temperature rating covers standard heating and cooling operating conditions.

Key Features

• R4.2 insulation value minimizes thermal loss on supply air runs
• Rip stop construction resists tearing during routing and installation
• 6,000 feet per minute maximum flow rate supports high-velocity systems
• Pressure rating of -0.5 to 10 inches water column for standard forced-air use
• Vapor transmission of 0.05 or less reduces moisture infiltration
• Tri-layer construction: polyester inner liner, fiberglass insulation, metalized polyester outer jacket
• Temperature rated from -20 to 180 degrees F for heating and cooling service

Compatibility

Designed as an OEM-style replacement and new-installation flexible duct for residential and light commercial forced-air HVAC supply branch duct systems requiring a 7-inch diameter connection.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with SMACNA flexible duct installation standards and applicable local mechanical codes. Power down the air handler or furnace and isolate the system before connecting or disconnecting duct sections. Secure each end with an approved duct clamp and mastic or UL-listed foil tape — do not rely on tape alone as the primary seal. Avoid sharp bends that reduce effective diameter and increase static pressure drop across the run.

Technical Specifications

• Inside Diameter: 7 inches
• Length: 25 feet
• Flow Rate: 6,000 feet per minute
• Insulation Value: R4.2
• Pressure Rating: -0.5 to 10 inches water column
• Temperature Rating: -20 to 180 degrees F
• Vapor Transmission: 0.05 or less
• Material: Polyester / Fiberglass / Metalized Polyester
• Finish: Silver
• Series: 40 Series
• Package Dimensions: 24 inches x 10.75 inches x 24 inches
• Weight: 10.21 pounds
• Country of Origin: Domestic

Standard Information

• Brand: QUIETFLEX
• Manufacturer Part Number: flex-r4-7bag