How must all joints in duct systems be treated to ensure proper functioning?

In duct systems, all joints must be sealed to ensure proper functioning. Sealing joints effectively prevents air leaks, which can lead to reduced efficiency, increased energy consumption, and poor indoor air quality. When joints are properly sealed, the mechanical system can maintain the desired airflow and pressure, ensuring that heating, ventilation, and air conditioning (HVAC) systems operate efficiently.

Sealing methods can vary, often involving the use of mastic, tape specifically designed for ductwork, or other sealing materials. These methods provide a durable barrier against air leaks while allowing for some flexibility to accommodate thermal expansion and contraction.

By sealing the joints, the system's overall performance improves, leading to a more comfortable indoor environment and reducing the workload on HVAC equipment, which in turn extends the lifespan of the system.