Floor Plenum Design

The number of plenum inlet locations is a function of the size of control zones access points available in the building amount of distribution ductwork used under the floor and other design issues.

Floor plenum design.

Warm air from ducts is discharged into the underflow plenum rather than directly. The following list of questions is a good place to start in this process. The source of heat is the downflow or counterflow warm air furnace commonly used to force air into under slab ductwork. It is important that conditioned air in a floor plenum flows into the occupied zone and does not leak into cavities risers stairwells heating trenches or other adjacent zones.

Plenum contents can have a major impact on the raised floor plenum performance. The basic arrangement in a plenum floor is that the floor is supported above the slab to leave space below for the heating plenum and utilities. Plenums are air compartments or chambers that are sometimes found in buildings either above suspended ceilings in the gap between the ceiling and the floor slab or below raised floors in the gap between the raised floor and the floor slab. A floor plenum is a void between a building s floor structure and a raised access floor used for distributing conditioned air to the spaces above.

Airfixture s underfloor air distribution system takes advantage of pressurized underfloor plenum spaces to provide air conditioning heating and ventilation. One of the main advantages of this setup is that plenum air supplies require less fan power to distribute air than through ducts improving efficiency and thus requiring less. During the pre design phase the contents and their impact should be conceptually identified.