What is an extended plenum duct system?

An extended plenum duct system is a type of HVAC ductwork design that utilizes a large, rectangular or square metal plenum to distribute air evenly throughout a building. The plenum acts as a central hub where conditioned air is delivered from the HVAC unit and then distributed to individual ducts or outlets. This design helps to improve airflow efficiency, reduce noise, and provide more consistent temperature control across different spaces. Extended plenums are often used in commercial settings for their ability to handle larger volumes of air.