What component is essential for limiting airflow in the distribution system?

The correct answer is pressure regulators, as they play a crucial role in managing and limiting airflow within an air distribution system. Pressure regulators function by maintaining a specified pressure level, ensuring that the airflow remains consistent and within the designed parameters. This is vital for optimal system performance and efficiency, as excessive airflow can lead to inefficiencies, potential system failure, or safety hazards.

In air distribution systems, controlling pressure is essential for various processes, such as maintaining the comfort level, ensuring proper operation of components, and preventing mechanical strain. By limiting airflow, pressure regulators help achieve a balance that enhances overall system reliability and effectiveness, making them indispensable in the management of airflow.