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How to Install Flex Duct

Lowe's Editorial Team

By Lowe's Editorial Team
Published October 28, 2024

Flex ducts are vital in modern HVAC systems as they can improve the efficiency and performance of your HVAC system. This guide will make it easy to understand how to connect a flex duct together and ensure your HVAC system runs smoothly and effectively.

Tools and Materials

Tools

Materials

Understanding Flex Duct

HVAC systems frequently use flex duct, also known as flexible ductwork. Because of its ease of installation, it is preferred over rigid ducting as it can fit into compact or uneven places.

Types of Flex Ducts

Flexible Duct

A flexible duct is a versatile option for various HVAC applications because of its ease of installation and flexibility. Different types of flexible ducts are as follows.

  • Insulated Polyester Flexible Duct
  • Foil Flexible Duct 

Semi-rigid flex duct

It balances flexibility and sturdiness, making it suitable for specific installations where a more rigid structure is beneficial.  Different types of semi-rigid flex ducts are as follows.

  • Semi-Rigid Silver Flexible Duct
  • Aluminum Semi-Rigid Flexible Duct

How to Install Flex Duct

How to Connect Flex Duct Together

Learning how to attach flex ducts properly ensures a reliable and efficient airflow.

How to Connect Flex Duct to Rigid Duct

Begin by cleaning the end of the rigid duct to remove any debris. Then, place the flexible duct over the end of the rigid duct, making sure it fits snugly. Use a metal clamp to secure the connection tightly. To avoid air leaks, seal the joint with duct tape. Lastly, check the connection to ensure it is secure and properly sealed.

Tip

Double-check the connection to make sure it's safe and sealed.

Caution

Wear protective gear, turn off power to HVAC components, handle tools carefully and ensure proper ventilation. Check for sharp edges on the duct and follow the manufacturer's installation instructions for safety.

How to Connect Flex Duct to Metal Duct

Start by cleaning the end of the metal duct. This helps ensure a good seal. Next, slip the flex duct over the end of the metal duct and secure it tightly with a metal clamp. Finally, use duct tape to seal the joint and prevent any leaks.

Installing flex ducts is a manageable DIY project that requires the right tools and guidance. By following these steps, you can ensure effective airflow, improve the functionality of your HVAC system, and make your house more comfortable.

Good to Know

A secure connection avoids air leaks and maintains system efficiency.