What specific purpose does the plenum serve in an HVAC system?

The primary purpose of the plenum in an HVAC system is to facilitate air distribution. It acts as a central chamber or conduit that collects air from the air handler or the furnace and then distributes it evenly to the various ductwork that leads to different areas of a building. This design ensures that air can be efficiently channeled throughout the space, providing comfort and maintaining desired temperature levels.

A well-designed plenum allows for balanced airflow, which is crucial for the overall efficiency and effectiveness of the HVAC system. It helps to manage the pressures within the duct system, allowing for the consistent delivery of conditioned air. This role is essential for maintaining comfort in residential and commercial spaces, as it contributes to proper ventilation and air circulation.

The other options, while related to the overall function of an HVAC system, do not accurately describe the specific function of the plenum. Reducing humidity is typically managed by air conditioning systems or dehumidifiers, increasing airflow velocity relates more to the design of ductwork and fan systems, and servicing electrical components is a maintenance function not directly associated with the plenum's role in the airflow dynamics of the HVAC system.