| 摘要 |
An exhaust filter unit is arranged outwardly surrounding at least a major portion of a housing of a vacuum cleaner. The dirt-laden incoming airflow is filtered through a primary filter, then blown by a suction motor unit into an annular exhaust air space between the vacuum cleaner housing and the exhaust filter unit. Thereby, the filtered air is exhausted in a diffused manner through the large surface area of the exhaust filter unit. Preferably, the exhaust filter unit has a cylindrical tubular configuration that completely externally surrounds a cylindrical portion of the vacuum cleaner housing.
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