There is provided a cartridge assembly (2) for use in an aerosol-generating system, the cartridge assembly (2) comprising a cartridge (6), a housing (4), a mouthpiece (8) and at least one linkage (40). The cartridge (6) comprises first and second compartments (30, 32) each having an air inlet (44, 46) and an air outlet (48, 50). The housing (4) encloses the cartridge (6), the housing (4) comprising air inlets (16, 18), air outlets (22, 24) and at least one guide slot (26, 28). The mouthpiece (8) comprises an air inlet (38) in fluid communication with the housing air outlets (22, 24). The at least one linkage (40) extends through the at least one guide slot (26, 28) and is connected to the cartridge (6) and the mouthpiece (8). The mouthpiece (8) and the cartridge (6) are rotatable with respect to the housing (4) from a first position to a second position. When the cartridge (6) is in the first position, the housing (4) obstructs the air inlets (44, 46) and the air outlets (48, 50) of the first and second compartments (30, 32). When the cartridge (6) is in the second position, the air inlets (44, 46) and the air outlets (48, 50) of the first and second compartments (30, 32) are in fluid communication with the housing air inlets (16, 18) and the housing air outlets (22, 24) respectively.Se proporciona una unidad de cartucho (2) para usar en un sistema generador de aerosol, donde la unidad de cartucho (2) comprende un cartucho (6), un alojamiento (4), una boquilla (8) y al menos una unión (40). El cartucho (6) comprende el primer y segundo compartimento (30, 32), cada uno con una entrada de aire (44, 46) y una salida de aire (48, 50). El alojamiento (4) contiene el cartucho (6), donde el alojamiento (4) comprende entradas de aire (16, 18), salidas de aire (22, 24) y al menos una ranura guía (26, 28). La boquilla (8) comprende una entrada de aire (38) en comunicación de fluidos con las salidas de aire (22, 24) del alojamiento. La o las uniones (40) se extienden a través
