These fans seem inconspicuous but move big volumes. They are called HVLS fans
(high volume, low speed) because they move large masses of air at a very low rotational
speed. MonsterFans are an inexpensive cooling instrument for buildings, as they can
reduce the ambient temperature by 5° C in summer. In winter, they achieve a
redistribution of the warm air cushions (destratification) below the ceiling. Potential
energy cost savings of 20% are to be expected for buildings of a height of 8 meters.