Which of the following is a critical factor in installing ductwork?

Ensuring proper sealing at joints is vital in installing ductwork because it directly affects the efficiency of the HVAC system. Properly sealed joints prevent air leakage, which can lead to energy loss and decreased system performance. When air escapes from the ductwork, it results in the system working harder to maintain desired temperatures, increasing energy costs and potentially leading to uneven heating or cooling in different areas of a building.

Moreover, properly sealed ductwork helps maintain indoor air quality by reducing the risk of contaminants entering the air stream from unsealed joints. This is particularly important in maintaining comfort and health standards within enclosed environments. By achieving tight seals at the joints, the HVAC system can function as intended without unnecessary strain, enhancing longevity and reliability.