You can expect residential ductwork to last anywhere from 25 to 70 years, with an average of 45 years. The difference in lifespan is due to the variables of materials, workmanship, and maintenance. Flexible ducts are known to have a shorter lifespan than hard ducts, and they tend to sink over time and restrict airflow if not properly suspended. Installing new air ducts with appropriate seals and insulation can help prevent unwanted visitors from entering your home through the HVAC system.
The International Association of Plumbing and Mechanical Officials is considering limiting the use of flexible ductwork in residential projects to no more than 5 feet in length, due to the loss of energy caused by friction that is inherent in the installation of flexible ducts, especially over longer stretches. This is because flexible ducts are more prone to air leakage than rigid ducts, which can lead to a decrease in energy efficiency and an increase in utility bills. The industry group Air Duct Council, which claims to represent the manufacturers and suppliers of 95 percent of flexible ducts used in North America, said the product can last as long as a house if properly installed. When flexible ducts are placed in accordance with the guidelines contained in the ACCA manuals on residential duct construction and HVAC installations, they are quiet, energy efficient, and work well. To ensure that your HVAC flex duct lasts as long as possible, it is important to have it installed correctly. This means using the right materials and techniques for your particular application.
Additionally, regular maintenance should be performed on your system to ensure that it is running efficiently and that any leaks or other issues are addressed quickly. Leaky return air ducts can also have a negative effect on your system's performance. These leaks draw unwanted air from a mezzanine or attic into the system, which can cause a decrease in energy efficiency and an increase in utility bills. Overall, HVAC flex duct can last anywhere from 25 to 70 years depending on the materials used, workmanship, and maintenance. To ensure that your system lasts as long as possible, it is important to have it installed correctly and perform regular maintenance.
