This is an advanced and specific view of the plenum for the type of data center layout that includes a raised floor environment, perforated tiles, and downflow CRACs. Unlike the Cooling overlay, the plenum overlays only consider room-based cooling.
Row-based cooling units, racks and other heat generating equipment are not taken into account in these calculations.
The color scale represents the various pressure differences between the air above and below the raised floor. The numbers in the pressure scale automatically adjust to include the values in the data center layout.
You can use this overlay to get an overview of the positions in the floor layout that are eligible for positioning the perforated tiles based on your insight into the plenum pressure. When you add tiles to the floor layout, you can use this insight to position perforated tiles where the pressure is high and preferably not too close to a downflow CRAC.