Even if you shut the windows and doors dust settles in rooms like gentle snow. The need:
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Even if you shut the windows and doors dust settles in rooms like gentle snow. The need: a device to remove dust from household floors. Here are three established concepts:
1. human-powered bellows pump with cloth filter;
2. axial-flow electric fan with muslin filter;
3. centrifugal fan with centrifugal dust separation and collection.
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