Why Flex Duct Is Bad

Flexible ductwork not only resists airflow, but is also more susceptible to a poor installation. Any number of factors can go wrong, including a poorly sealed joint, excessive length that lacks support and crumpled sections. Also, the material itself is less durable than sheet metal.

What is a flex duct?

Flex ductwork is a long ductwork tube that fits more flexibly into awkward home spaces than rigid ductwork. Many HVAC contractors will combine rigid and flex ductwork to create a duct network that fits the space the house provides.

What is the disadvantage of flex duct?

The downside of flex ducting is that it is considered temporary with an acknowledged lifespan of only about 15 years. Another major disadvantage is that they are a little too flexible, so they are often incorrectly installed. And with greater friction than metal ducts, proper sizing is critical.