The invention concerns a beverage dispenser comprising:—a housing (4)—at least two containers (2) for storing a water soluble beverage powder, each container comprising a tank (21) and an outlet (22),—at least two dissolution chambers (3), each being operatively linked to one of the containers (2) for preparing a beverage from the water soluble beverage powder and a diluent,—for each dissolution chamber (3), an extractor hood (5) at the top of said dissolution chamber,—an evacuating fan (6),—an extraction device (7) connected to each extractor hood (5) and to said evacuating fan (6), said extraction device comprising internal paths (71) for guiding flows from the extractor hoods through the extraction device, wherein:—the extraction device (7) is an essentially parallelepipedic box connected: to each extractor hood (6) through cooperating holes (71) on its front lateral side, and to the evacuating fan (36) through one cooperating holes (72) on one other lateral side,—the box of the extraction device is fully removable from the housing (4),—the box consists of a lower part (7a) and an upper part (7b) and is configured for being manually opened by separating the lower part (7a) from the upper part (7b).