5” Insulated Flex Duct – R6

5 Inch Insulated Flex Duct R6 provides a flexible air-distribution solution for compatible residential and light commercial HVAC systems. Its flexible construction makes it easier to route conditioned air through attics, ceilings, crawlspaces and other areas where rigid ductwork may be difficult to install.

This duct combines a reinforced flexible inner core, fiberglass thermal insulation and an exterior vapor barrier. The 25-foot length allows installers to create a continuous duct run while minimizing unnecessary connections.

5 Inch Insulated Flex Duct R6 Features

• Nominal inside diameter: 5 inches
• Flexible duct length: 25 feet
• Thermal insulation rating: R6
• Fiberglass insulation material
• Reinforced flexible inner core
• Durable exterior vapor barrier
• Suitable for compatible supply and return air systems
• Designed for residential and light commercial HVAC applications

R6 Thermal Insulation

The R6 fiberglass insulation surrounding the inner duct helps reduce heat transfer between the conditioned air and the surrounding environment. This is particularly helpful when ductwork passes through an attic, crawlspace or another area outside the conditioned building envelope.

Insulation can help preserve the temperature of heated or cooled air as it moves through the system. Actual thermal performance depends on proper installation, complete insulation coverage and correctly sealed connections.

Flexible 5-Inch HVAC Duct

The 5 Inch Insulated Flex Duct R6 has a nominal 5-inch internal diameter. Its flexible construction allows the duct to follow an HVAC layout without requiring as many separate elbows and rigid fittings.

Flexibility does not eliminate the need for proper routing. The duct should be installed as straight as practical and fully extended between supports. Compression, twisting, sagging and sharp bends can increase resistance and reduce airflow.

Convenient 25-Foot Length

The 25-foot length provides material for a continuous branch run in many residential applications. Using a continuous section can help reduce the number of joints that require mechanical fastening and sealing.

The duct should not automatically be installed at its complete length. Excess material can create bends or compression that restrict airflow. Measure the required route carefully and use only the appropriate length for the installation.

Reinforced Flexible Inner Core

The reinforced inner core creates the airflow pathway inside the duct. It is designed to remain flexible while maintaining its round shape when correctly installed and supported.

During installation, handle the inner core carefully to avoid punctures, tears or crushing. A damaged core may allow conditioned air to escape into an attic or crawlspace and can reduce the amount of air reaching the intended room.

Exterior Vapor Barrier

The outer jacket functions as a vapor barrier and helps protect the fiberglass insulation. It should remain intact and properly sealed at every connection to limit moisture movement into the insulation layer.

Damage to the exterior jacket should be repaired using materials approved for insulated flexible HVAC duct. Ordinary household tape may deteriorate and should not replace an HVAC-rated sealing product.

Installing the 5 Inch Insulated Flex Duct R6

Before installation, confirm that the 5 Inch Insulated Flex Duct R6 matches the required duct size and airflow calculation. Inspect the inner core, insulation and exterior jacket for shipping or handling damage.

Extend the duct along the planned route without stretching it excessively. Avoid tight turns, sharp bends and unnecessary changes in direction. Provide supports at suitable intervals to prevent excessive sagging.

Connect the inner core to a compatible 5-inch collar or fitting. Secure the connection with an approved mechanical fastener and seal it using an HVAC-rated material.

Pull the fiberglass insulation over the connection without leaving gaps. Then position and seal the exterior vapor barrier to create a continuous insulated assembly.

Supply and Return Air Applications

This duct may be used in compatible supply or return air systems when properly sized. Supply duct delivers conditioned air to rooms, while return duct carries indoor air back to the HVAC equipment.

The required duct size depends on the airflow needed for the application. A 5-inch duct should not be selected based only on the size of an existing collar or grille.

Airflow and Duct Sizing

Correct duct sizing is essential for comfort and HVAC performance. A duct that is too small may create excess resistance, airflow noise and reduced air delivery.

A qualified HVAC professional should calculate the required airflow and verify that the 5 Inch Insulated Flex Duct R6 is appropriate for the intended branch. Equipment capacity, duct length, fittings and static pressure must all be considered.

Inspection and Maintenance

Periodically inspect accessible sections for disconnected joints, damaged outer jackets, compressed areas or excessive sagging. Correct visible problems before they affect airflow or allow conditioned air to escape.

If a room develops weak airflow or inconsistent temperatures, have the duct system inspected. The problem may be caused by damage, leakage, restriction, incorrect sizing or another condition within the system.

Professional Installation Recommended

Professional installation of the 5 Inch Insulated Flex Duct R6 is recommended. A qualified HVAC technician can verify the required diameter, create an efficient route, support the duct correctly and seal each connection.

Explore more HVAC ducting and venting supplies from Xpress Supply. For additional information about efficient air distribution, visit the U.S. Department of Energy duct efficiency guide.