Sizing is a function of the in-plant ambient conditions and the plant location. As shown in the sizing chart, more frequent air changes are needed in hotter and more humid locations.
Effective temperatures with “wind chill” effect in the 70’s can be maintained by following these sizing steps Determine the in-plant temperature rise over outdoor ambient. Identify target air change rates from the chart.
Determine the size of the cubic area to be cooled. The cubic area is calculated by multiplying the square foot of the floor by 10.
Divide the cubic footage of the area by the target air change number. The result is the CFM needed.