| 摘要 |
PURPOSE: A filter sensing structure is provided to easily grasp whether a filter is clogged by an air pressure difference between filters. CONSTITUTION: A filter sensing structure includes a filter(11), a differential pressure sensor, and a display unit. The differential pressure sensor calculates pressure of air before/after air is inputted into the filter. The display unit displays a different color according to a size of a difference value of the pressure in the differential pressure sensor. When micro holes of the filter are clogged by dust, differences of flow amount, flow speed, and pressure of air between filters are generated.
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