Air-distribution device based on the coanda effect with means for imparting a circulatory motion on the flow of air not properly oriented

Described herein is a Coanda-effect air distributor for distributing a flow (F) between a number of ducts set downstream (8, 9, 10). Provided in the area that separates the initial ends of two ducts set downstream (8, 9, 10) is the inlet of a recirculation duct that creates an air circulation that masks the entrance of a duct set downstream when the flow (F) is deviated into the other duct.