Clean rooms
Clean rooms or ultra-clean rooms place particularly high demands on the ambient air. The particle count must be reduced to a minimum. In the table below you will find the classifications of clean rooms according to DIN EN ISO 14644-1. The classification according to US FED STD 209E / 209D(clean room classes 1 - 100,000) is no longer valid since 29 November 2001, since then the clean room classes ISO 1 - ISO 9 apply.
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1 m³ of air next to a smoker contains up to 100,000,000 particles > 0.5 µm
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1 m³ of city air (zone 30) contains up to 500,000 particles > 0.5 µm
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1 m³ of air at the North Pole contains up to 10,000 particles > 0.5 µm
For comparison:
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1 m³ of air in a clean room class 100 / ISO 5 contains a maximum of 3,520 particles > 0.5 µm
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1 m³ of air in a clean room class 1 / ISO 3 contains a maximum of 35 particles > 0.5 µm
Limit values (particles per m³) for particles equal to or greater than ... | ||||||
ISO class | 0.1 µm | 0.2 µm | 0.3 µm | 0.5 µm | 1.0 µm | 5.0 µm |
| ISO 1 | 10 | 2 | ||||
| ISO 2 | 100 | 24 | 10 | 4 | ||
| ISO 3 | 1.000 | 237 | 102 | 35 | 8 | |
| ISO 4 | 10.000 | 2.370 | 1.020 | 352 | 83 | |
| ISO 5 | 100.000 | 23.700 | 10.200 | 3.520 | 832 | 29 |
| ISO 6 | 1.000.000 | 237.000 | 102.000 | 35.200 | 8.320 | 293 |
| ISO 7 | 352.000 | 83.200 | 2.930 | |||
| ISO 8 | 3.520.000 | 832.000 | 29.300 | |||
| ISO 9 | 35.200.000 | 8.320.000 | 293.000 | |||
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