Which type of seam must be sealed on a duct system?

Sealing longitudinal seams in a duct system is crucial to maintain the system's efficiency and performance. Longitudinal seams run parallel to the length of the duct, and when they are not properly sealed, they can lead to significant air leakage. This air loss not only reduces the efficiency of the HVAC system but can also increase energy costs and lead to poor indoor air quality due to unconditioned air entering the system.

When constructing ductwork, ensuring that longitudinal seams are sealed can prevent issues such as noise from air turbulence, reduced airflow, and diminished heating or cooling effectiveness. Sealing techniques may include the use of mastic sealant, tape, or mechanical fasteners, depending on the specific requirements of the installation and the materials being used. This sealing process is a key part of ensuring that the duct system operates as designed, delivering optimal performance and efficiency.