High volume low speed (HVLS) fans are the newest ventilation option available to dairy and livestock farmers. These large fans, which range in size from 16 to 24 feet, provide energy-efficient air movement throughout the barn at a fraction of the energy cost of high-speed fans.

Advantages of HVLS

The main advantage of an HVLS fan is its energy efficiency. One 20-foot fan typically moves approximately 125,000 cfm of air. It takes six–seven standard alley fans to provide similar air volume. Most HVLS fans have a 1 HP motor, moving the same volume of air for approximately one-third of the energy cost of six high-speed fans. According to a recent University of Wisconsin (UW) study, an HVLS fan costs approximately $1 per day to operate.

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