Apparatus for preparing a beverage using a soluble preparation, comprising a container for a soluble preparation, a mixer provided with a mixing chamber, said chamber having a filling inlet for the soluble preparation, at least one opening for supplying a liquid for solubilizing the preparation and forming the beverage, a duct for evacuating any vapor and/or aerosol which forms during preparation of the beverage, said duct comprising a suction fan, as well as an opening for dispensing the prepared beverage, a centrifuging device housed inside said mixing chamber and rotationally operated by an associated electric motor positioned outside said chamber, means for conveying a predetermined quantity of soluble preparation from the said container to the filling inlet of said mixing chamber, as well as means for conveying the solubilizing liquid from the associated source to the respective opening of the mixing chamber.The apparatus includes means for closing and opening the said duct for evacuating any vapor and/or aerosol which forms during preparation of the beverage.