Aerosol-generating system with enhanced airflow management

A method of manufacture of a cartridge for use in an electrically operated aerosol-generating system, comprising:

• providing a liquid storage portion comprising a housing having an opening;
• providing a capillary medium within the liquid storage portion;
• filling the liquid storage portion with liquid aerosol-forming substrate;
• and
• providing a fluid permeable heater assembly comprising an arrangement of electrically conductive filaments arranged to define an air impingement surface, the electrically conductive filaments forming a mesh, wherein the fluid permeable heater assembly extends across the opening of the housing, and wherein the filament arrangement defines a filament opening allowing airflow to pass through, the filament opening having an area at least five times larger than an area of an interstice between filaments of the filament arrangement forming the mesh;
• and
• wherein the capillary medium is provided in contact with the heater assembly, and the capillary medium comprises a capillary medium opening allowing airflow to pass through the capillary medium.