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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