Dirty filters, closed vents, or damaged branch ducts do not always cause airflow problems. In many homes, restrictions start near the heating and cooling equipment, where the supply and return plenums ...

Incorporating a plenum can have its design advantages, but corridors serving adjoining areas of health care occupancies are prohibited from being used for a portion of an air supply, air return, or ...

As many contractors attest, a supply air plenum is a sheet metal box attached to a furnace or air handler’s outlet and is used as a central manifold connector for other ductwork. As the air blows from ...