Extractor hood comprising: - a box body having a base portion intended to be disposed above a cooktop; said box body defining an internal chamber, - an extractor fan with at least one inlet (21, 22) in communication with said internal chamber of the box body, in such a way to create a depression in the internal chamber of the box body to extract fumes from the cooktop through an opening of said base portion of the box body, - a delivery fan with one inlet in communication with said internal chamber of the box body and one outlet in communication with a delivery conduit having one end disposed in said base portion of the box body, before said opening of the base portion of the box body through which the fumes are extracted, - a distributor disposed at the end of said delivery conduit; said distributor comprising an annular body with an internal surface with truncated-conical shape having an axis that coincides with the axis of the distributor, and a plurality of deflector fins that protrude from the internal surface of the annular body towards the inside of the distributor; said deflector fins being inclined by an angle (α; α1) different from zero with respect to a radial straight line passing through the axis of the distributor and a junction line of the deflector fin to the internal surface of the annular body of the distributor, in such a way to generate at least one vortex-shaped flow (V1; V2) that rotates around the axis of the distributor, under the distributor and in front of the opening of the base portion of the box body through which the fumes are extracted; characterised in that said distributor comprises: - a first set of deflector fins that extend for half of the distributor circumference; and - a second set of deflector fins disposed symmetrically to the deflector fins of the first set with respect to the distributor diameter, in such a way to obtain two vortexes (V1, V2) that come out from the bottom of the distributor; the first vortex rotating in clockwise direction around the axis of the distributor along a helicoidal trajectory; the second vortex rotating in anticlockwise direction around the axis of the distributor along a helicolidal trajectory; the distributor being disposed in the hood in such a way that the two vortexes (V1, V2) meet in a position of the opening of the box body of the hood disposed behind the distributor. - a box body having a base portion intended to be disposed above a cooktop; said box body defining an internal chamber, - an extractor fan with at least one inlet (21, 22) in communication with said internal chamber of the box body, in such a way to create a depression in the internal chamber of the box body to extract fumes from the cooktop through an opening of said base portion of the box body, - a delivery fan with one inlet in communication with said internal chamber of the box body and one outlet in communication with a delivery conduit having one end disposed in said base portion of the box body, before said opening of the base portion of the box body through which the fumes are extracted, - a distributor disposed at the end of said delivery conduit; said distributor comprising an annular body with an internal surface with truncated-conical shape having an axis that coincides with the axis of the distributor, and a plurality of deflector fins that protrude from the internal surface of the annular body towards the inside of the distributor; said deflector fins being inclined by an angle (α; α1) different from zero with respect to a radial straight line passing through the axis of the distributor and a junction line of the deflector fin to the internal surface of the annular body of the distributor, in such a way to generate at least one vortex-shaped flow (V1; V2) that rotates around the axis of the distributor, under the distributor and in front of the opening of the base portion of the box body through which the fumes are extracted; - a first set of deflector fins that extend for half of the distributor circumference; and - a second set of deflector fins disposed symmetrically to the deflector fins of the first set with respect to the distributor diameter,