ANOTHER SYSTEM OF CLASSIFICATION FOR CLEAN AREA
| Class | Number of Particle Diameter (um) | |||
| 0.1 | 0.3 | 0.5 | 5 | |
| 1 | 35 | 3 | 1 | |
| 10 | 350 | 35 | 10 | |
| 100 | | 300 | 100 | |
| 1000 | | | 1000 | 7 |
| 10,000 | | | 10,000 | 70 |
| 100,000 | | | 100,000 | 700 |
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