| 摘要 |
A filter housing (60) comprises an inlet for receiving airflow, a cavity for receiving a filter (70) and an airflow passage between the inlet and the filter (70). At least one vane (65a, 65b, 65c) is positioned in the airflow passage for partitioning the airflow passage into a plurality of ducts (51, 52, 53). Each vane (65a, 65b) has a non-linear shape in the direction of flow through the airflow passage. This helps to reduce acoustic emissions from the machine since sound waves emitted by the fan and/or motor are caused to bounce off the vanes (65a, 65b), which allows the vanes (65a, 65b) to absorb some of the sound energy. The filter housing (60) can form part of a vacuum cleaner.
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