Does this mean I canât ever say âciao?â Of course the answer to this is no. Youâll hear ciao being said all over Italy â itâs an incredibly common greeting throughout the country. But if youâre paying closer attention, youâll see that itâs almost always used between people who know one another or are in the same peer group.
In building construction, a plenum (pronounced PLEH-nuhm, from Latin meaning full) is a separate space provided for air circulation for heating, ventilation, and air-conditioning (sometimes referred to as HVAC) and typically provided in the space between the structural ceiling and a drop-down ceiling.n buildings with computer installations, the plenum space is often used to house connecting communication cables. Because ordinary cable introduces a toxic hazard in the event of fire, special plenum cabling is required in plenum areas.
Supply Air Plenums. 1  These supply air plenums are sheet metal boxes that attach to the outlet of a furnace or air handler and are used as a central manifold for other ductwork to connect to. 2  As the air blows from the furnace or air handler, it flows through the supply plenum and any ductwork attached to it. These sheet metal take-offs are designed to attach to a flat duct to allow you to connect round ducting to it. 2  They are used to attach your ducting to a supply or return air plenum. 3  Choose the size that matches the diameter of the ducting you will be using.