It is an inflection of fanning, which means beating the air with something. In the area north of Colombia say fan to a ceiling fan. Also a range is the bit of fabric and a few thin rods of ladies used to fan, taking air in the face to combat the heat. It is also used by the flamenco dancers. Ventalle, protruding, flabellum, blower. In geology, alluvial fan is an explayamiento generated by a river, which falls Canyon of the mountain and a part becomes flat and spreads. It is an area of high risk for avalanches. Armero was located over a range of a river (Río Lagunillas), perhaps the smallest of all in Colombia, less than the Ibagué, Villavicencio, Yopal.
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