• Supply air is obtained through intake louvers, windows or roof vents. Supply fans and PRVs may be substituted where job requirements make it necessary or advisable. 
• Successful systems based on this method rely on correct velocity and controlled distribution of air flow. Refer to velocity table on page 9 for recommendations.

Illustration shows schematic floor plan of actual breeze conditioning system for corrugated paper board production plant. 

• Areas A and C are critical problem areas. Personnel discomfort from hot, humid conditions was acute in these areas. Area B is largely for storage and very few employees are located there. 
• Due to the size of the plant, both supply and exhaust fans were used to obtain these air velocities: 280 FPM in area A, 225 FPM in area C.
• With prevailing winds from the southwest, all exhaust fans were located on the east side of the building. One exhaust fan on the west wall was required by heat-producing machine at that location.
• East wall of area C was not available for exhaust fan location. This necessitated use of north and south walls as alternate locations. 
• Total fan capacity for this plant was near l,000,000 CFM.

Use of deflectors, baffles and air circulators (with air velocity method)

Figure 1:  Deflector near air intake directs air into occupied area near floor level.  Baffle near mid-point of building reconcentrates air flow into occupied area.

Figure 2: Deflectors under supply PRV and in front of supply fan diffuse intake air and prevent high velocity air currents from flowing directly over occupants located near intake area.

Figure 3: Air circulators are used to boost air velocity through big buildings that have a flow pattern difficult to control.  Air circulators also re-direct air into occupied area near floor level