Vacuum cleaner apparatus, vacuum cleaner unit, and method of operating a vacuum cleaner apparatus

A method of operating a vacuum cleaner apparatus comprising:

• a first vacuum cleaner unit having a first motor/fan unit and a first dust separation unit arranged in the first vacuum cleaner unit, wherein the first motor/fan unit is configured to generate an airflow through an airflow path of the first vacuum cleaner unit to the first dust separation unit;
• a second vacuum cleaner unit having a second motor/fan unit and a second dust separation unit arranged in the second vacuum cleaner unit, and wherein the second motor/fan unit is configured to generate an airflow from a suction inlet of the second vacuum cleaner unit to the second dust separation unit;
• a holding arrangement configured to hold the second vacuum cleaner unit relative to the first vacuum cleaner unit when the suction inlet of the second vacuum cleaner unit is connected to the airflow path of the first vacuum cleaner unit, the holding arrangement comprising an aperture between the suction inlet of the second vacuum cleaner unit and the airflow path of the first vacuum cleaner unit when the suction inlet of the second vacuum cleaner unit is connected to the airflow path of the first vacuum cleaner unit;
• and
• a closure member connected to the first vacuum cleaner unit and movably arranged between an open position in which the closure member opens the aperture and a closed position in which the closure member closes the aperture,
• wherein the suction inlet of the second vacuum cleaner unit is disposed above the second dust separation unit when the second vacuum cleaner unit is connected to the first vacuum cleaner unit and the first vacuum cleaner is in an upright position, and
• wherein the method comprises:
• operating the first motor/fan unit and the second motor/fan unit simultaneously in a cooperative cleaning mode.