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High volume low speed (HVLS) fans are configured as large diameter paddle fans with 10 foils (blades). The foils range from 4-12 long making the diameter of the fan approximately 8-24 in diameter. The foils are positioned horizontally attached to a hub mounted on a -1 hp motor shaft. The fan operates at a speed of between 117 and 50 rpm (8-24 diameter). The fans have been used in industrial buildings to circulate ventilation air at a low velocity (3 mph). The fans have also been used in poultry and livestock barns to provide supplemental cooling of the animals by increasing air circulation and air velocity in the barn. Horizontal velocity data at the cow level (5 from floor) was collected on several dairy farms where the HVLS fans have been installed to document velocities achieved with different fan arrangements.