Big Fan Fundamentals

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Condensation buildup, chemical exposure, poor indoor air quality (IAQ) -- these are just a few of the concerns that plague warehouse facilities. Effective air movement by way of high volume, low speed (HVLS) fans up to 24 feet in diameter works with existing conditioning systems or on their own to create a healthier, safer, more comfortable environment. Increased productivity prevails by improving these variables.

Understanding how high volume low speed fans circulate and distribute air is the first step in realizing the vast potential air movement can provide, especially when it comes to overall safety.

Properly engineered HVLS fans take advantage of their size, not speed, to move massive amounts of air.  By doubling the length of the airfoil, the surface area that those airfoils sweep is increased four times. As the size gets larger, the amount of air the fan moves increases at a much faster rate than the amount of power it takes to turn it. So, with all things being equal, a larger fan, up to 24 feet in diameter, becomes more efficient.

Another product that can be installed along the airfoil is called AirFences.  AirFences redirect air that would otherwise slide off and be lost. This technology increases efficiency while contributing to a 28 percent improvement in coverage area.

By design, the effectiveness of a fan is largely determined by its airfoils. The shape of the foil combined with its pitch, or angle of attack, are key parameters in determining amount of air moved with the energy required in the effort. An exaggerated pitch airfoils with an almost vertical angle of attack will increase drag (and increase energy draw), while a flat, mostly horizontal airfoil will typically not move much air at all; the most efficient angle lies somewhere in between.

Comfort, condensation and productivity are all other areas that are improved with the use of HVLS fans.