What is the primary purpose of a plenum in an HVAC system?

The primary purpose of a plenum in an HVAC system is to distribute air from the HVAC unit to the duct system. In an HVAC setup, a plenum acts as a central distribution point that receives conditioned air—whether heated or cooled—from the unit. Once the air enters the plenum, it disperses into various ducts that channel the air throughout the building. This design ensures an even and efficient distribution of air, which is crucial for maintaining comfortable indoor temperatures and effective ventilation.

The function of dynamic air movement from the plenum to the ducts helps in improving the overall efficiency of the HVAC system. By facilitating proper airflow, the plenum supports the operation of the system in a balanced manner, addressing comfort and energy use within the building. Understanding the plenum's role is essential for HVAC technicians when designing, installing, or troubleshooting HVAC systems.