HVLS fans have always fascinated people (maybe not as much as when they see aeroplanes take off & fly) as to how these simple machines can move such large volumes of air.
HVLS fans are basically ceiling fans. However the key difference is that while the residential fans are smaller in diameter, have insignificant blade angle & spin at extremely high and noisy speeds, the HVLS fans spin at very low rpms (revolutions per minute), have a much higher angle of attack (blade angle) and have extremely large diameters. Depending upon the model, the HVLS fans use a very high torque geared or gearless motor drives.
In essence, HVLS fans are large ceiling fans that move High Volumes of air & Low Speeds.
Aeroboost® HVLS fans distributes large quantum of air across very large area very effectively. As they move large air quantities across human beings, this air movement breaks up the moisture-saturated boundary layer surrounding the body and accelerates evaporation to produce a cooling effect.
The HVLS fan creates a large column of air which is roughly as wide as the diameter of the fan itself. As the air column is pushed downward to the floor by the slow-rotating blades, the air disperses evenly in every horizontal directions when it comes in contact with the floor creating a steady air flow. This efficient air circulation helps accelerate the evaporation of sweat from the skin to create the feeling of a cooler work environment.
Aeroboost® fans can help create a perceived 'feel' temperature drop of as much as 8°C!
Like an aircraft, the wings of the plane are designed to hit the air at a certain angle of attack' thus creating a certain level of 'lift' beneath the wings & the turbine engines provide the thrust to move the plane forward. Similarly, every HVLS fan are different as they have different blade designs, different angle of attack & a different turbine (Geared Motors) to drive the fans and overcome the Air Drag, there by pushing the air downwards & the volume of air (cfm) created by the respective models depends of a combination of all these factors.
It is also important to note that the performance of the fan vastly depends on its installed surroundings including factors like gap between the blades & ceiling, distance between blade tip & side walls & the distance between the blades & floor level. Therefore the same fan model will perform differently if any of the above factors are changed.