Heater assembly having a fastener

A heater assembly for an aerosol-generating device, the heater assembly comprising:

• a first heater casing comprising an air inlet;
• a second heater casing comprising an aerosol outlet;
• and
• a heating chamber configured to heat an aerosol-forming substrate, the heating chamber being in fluid communication with both the air inlet and aerosol outlet to define an airflow pathway through the heater assembly,
• wherein the heating chamber is arranged between the first and the second heater casings, and
• wherein the first and the second heater casings are attached to each other by a fastener, the fastener being configured to exert an axial force on the first and the second heater casings to urge axially opposing internal surfaces of the first and the second heater casings into sealing engagement with respective axially opposing end surfaces of the heating chamber to seal the airflow pathway.

A method of manufacturing a heater assembly for an aerosol-generating device, the method comprising:

• providing a first heater casing comprising an air inlet;
• providing a second heater casing comprising an aerosol outlet;
• providing a heating chamber for heating an aerosol-forming substrate and arranging the heating chamber such that the heating chamber is in fluid communication with both the air inlet and the air outlet to define an airflow pathway through the heater assembly;
• arranging the heating chamber between the first and the second heater casings;
• and
• attaching the first and the second heater casings to each other using a fastener, the fastener being configured to exert an axial force on the first and the second heater casings to urge axially opposing internal surfaces of the first and the second heater casings into sealing engagement with respective axially opposing end surfaces of the heating chamber to seal the airflow pathway.