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 The classification according to US FED STD 209E / 209D(clean room classes 1 - 100,000) is no longer valid since 29 November 2001, since then the clean room classes ISO 1 - ISO 9 apply.

  • 1 m³ of air next to a smoker contains up to 100,000,000 particles > 0.5 µm

  • 1 m³ of city air (zone 30) contains up to 500,000 particles > 0.5 µm

  • 1 m³ of air at the North Pole contains up to 10,000 particles > 0.5 µm

For comparison:

  • 1 m³ of air in a clean room class 100 / ISO 5 contains a maximum of 3,520 particles > 0.5 µm

  • 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
ISO Class
Corresponds to approx. US FED 209E
Corresponds to approx. US FED 209D
ISO 1
ISO 2
ISO 3 M1,5 Grade 1
ISO 4 M2,5 Grade 10
ISO 5 M3,5 Grade 100
ISO 6 M4,5 Class 1.000
ISO 7 M5,5 Class 10.000
ISO 8 M6,5 Class 100.000
ISO 9 M7,5
EU-GMP Class
Idle state
Operating condition
Max. allowed number of particles /m3(equal or higher than)
0.5 µm
5.0 µm
0.5 µm
5.0 µm
A 3.520 20 3.520 20
B 3.520 29 352.000 2.900
C 352.000 2.900 3.520.000 29.000
D 3.520.000 29.000 not determined not determined
ISO 14644-1
EG-GMP non-operational
EC-GMP operational
1
2
3
4
5 A / B A
6
7 C B
8 D C
9

Source

 

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