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Federal Standard 209E Class Limits
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Class Limits
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Class Name
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>= 0.1µm
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>=0.2µm
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|
>= 0.3µm
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>= 0.5µm
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>=5.0µm
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|
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Volume Units
|
|
SI
|
English
|
m3
|
ft3
|
m3
|
ft3
|
m3
|
ft3
|
m3
|
ft3
|
m3
|
ft3
|
|
M 1
|
|
350
|
9.91
|
75.7
|
2.14
|
30.9
|
0.875
|
10.0
|
0.283
|
--
|
--
|
|
M 1.5
|
1
|
1240
|
35
|
265
|
7.50
|
106
|
3.00
|
35.3
|
1.00
|
--
|
--
|
|
M 2
|
|
3500
|
99.1
|
757
|
21.4
|
309
|
8.75
|
100
|
2.83
|
--
|
--
|
|
M 2.5
|
10
|
12400
|
350
|
2650
|
75.0
|
1060
|
30.0
|
353
|
10.0
|
--
|
--
|
|
M 3
|
|
35000
|
991
|
7570
|
214
|
3090
|
87.5
|
1000
|
28.3
|
--
|
--
|
|
M 3.5
|
100
|
--
|
--
|
26500
|
750
|
10600
|
300
|
3530
|
100
|
--
|
--
|
|
M 4
|
|
--
|
--
|
75700
|
2140
|
30900
|
875
|
10000
|
283
|
--
|
--
|
|
M 4.5
|
1000
|
--
|
--
|
--
|
--
|
--
|
--
|
35300
|
1000
|
247
|
7.00
|
|
M 5
|
|
--
|
--
|
--
|
--
|
--
|
--
|
100000
|
2830
|
618
|
17.5
|
|
M 5.5
|
10000
|
--
|
--
|
--
|
--
|
--
|
--
|
353000
|
10000
|
2470
|
70.0
|
|
M 6
|
|
--
|
--
|
--
|
--
|
--
|
--
|
1000000
|
28300
|
6180
|
175
|
|
M 6.5
|
100000
|
--
|
--
|
--
|
--
|
--
|
--
|
3350000
|
100000
|
24700
|
700
|
|
M 7
|
|
--
|
--
|
--
|
--
|
--
|
--
|
10000000
|
283000
|
61800
|
1750
|
|
|
|
|
|
|
|
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Click Here For Advanced Cleanroom Products
|
Useful Information
Federal
Standard 209D Class Limits
Federal
Standard 209E Class Limits
ISO Standard
14644-1 Class Limits
Comparison
between selected equivalent classes of
FS 209 and ISO 14644-1
Airborne classification
in the EU GGMP
Contamination
Classification
Particles in Outdoor
Air
Schedule of Mandatory
Testing
Schedule of Optional
Testing
International
Standards Comparison
Limits for
Microbial contamination
Air classification
as per WHO 2002
Air classification
as per Schedule M
Operations
for Aseptic Preparation
Operations for Terminally Sterilised Products
Environmental
Monitoring for Cleanrooms
Air Classifications
Special
Requirements for ISO Class 3 Cleanroom
Cleanroom Industry
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