A cartridge for an aerosol-generating system, the cartridge comprising: a cartridge body comprising a cartridge main body and a cartridge cap configured to connect to the cartridge main body ; and a fluid-permeable heating element disposed within the cartridge body, covered by the cartridge cap ; wherein the cartridge body comprises at least one cartridge air inlet formed in the cartridge cap , and at least one cartridge air outlet ; and a cartridge airflow path extending from the at least one cartridge air inlet to the at least one cartridge air outlet , via the fluid-permeable heating element ; wherein the cartridge cap comprises Z r a threaded member disposed therein, the threaded member being configured to move within the cartridge body between: a first position, in which the threaded member blocks air from the cartridge air inlet from flowing to the cartridge air outlet , via the fluid-permeable heating element ; and a second position, in which the threaded member is spaced away from the heating element to define an airflow path from the cartridge air inlet to the cartridge air outlet , via the fluid-permeable heating element ; and wherein the threaded member is configured to move between the first and second positions by way of a threaded engagement between an outer threaded surface of the threaded member and a corresponding threaded inner surface on another part of the cartridge cap . a cartridge body comprising a cartridge main body and a cartridge cap configured to connect to the cartridge main body ; and a fluid-permeable heating element disposed within the cartridge body, covered by the cartridge cap ; wherein the cartridge body comprises at least one cartridge air inlet formed in the cartridge cap , and at least one cartridge air outlet ; and a cartridge airflow path extending from the at least one cartridge air inlet to the at least one cartridge air outlet , via the fluid-permeable heating element ; wherein the cartridge cap comprises Z r a threaded member disposed therein, the threaded member being configured to move within the cartridge body between: a first position, in which the threaded member blocks air from the cartridge air inlet from flowing to the cartridge air outlet , via the fluid-permeable heating element ; and a second position, in which the threaded member is spaced away from the heating element to define an airflow path from the cartridge air inlet to the cartridge air outlet , via the fluid-permeable heating element ; and wherein the threaded member is configured to move between the first and second positions by way of a threaded engagement between an outer threaded surface of the threaded member and a corresponding threaded inner surface on another part of the cartridge cap . a first position, in which the threaded member blocks air from the cartridge air inlet from flowing to the cartridge air outlet , via the fluid-permeable heating element ; and a second position, in which the threaded member is spaced away from the heating element to define an airflow path from the cartridge air inlet to the cartridge air outlet , via the fluid-permeable heating element ; and wherein the threaded member is configured to move between the first and second positions by way of a threaded engagement between an outer threaded surface of the threaded member and a corresponding threaded inner surface on another part of the cartridge cap . <EOS>