What feature must be included in duct installation to maintain proper airflow?

To maintain proper airflow in duct installation, sealing at all joints is essential. When ducts are not properly sealed, air can leak out at the connections, which diminishes system efficiency and can lead to uneven heating or cooling in the space served by the duct system. Sealing joints prevents air loss, ensuring that the conditioned air is delivered effectively throughout the intended areas. This practice not only enhances the performance of the HVAC system but also contributes to energy savings by reducing the amount of energy required to maintain the desired temperature.

While supports at intervals, horizontal ducting, and the installation of filters are important aspects of ductwork design, they do not directly address the critical issue of maintaining airflow integrity as sealing does. Proper sealing is fundamental to ensure that the airflow is directed where it is needed without unnecessary losses.