Abstract: A reduction unit, particularly of the epicyclic type, comprising a casing for the rotary support and containment of an input shaft, of an output shaft, and of at least one reduction stage that is interposed between them, the input shaft being able to rotate by an actuation shaft of a motor, which can be associated monolithically and coaxially with the input shaft. The reduction unit comprises at least one fan, which is arranged substantially coaxially to the input shaft, proximate to the reduction unit, and is supported even indirectly by one of the shafts.