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Sterile Environment Technologies practices
proper procedures to Decontaminate your Cleanroom, Data Center, and other critical
environments. ISO 14644 Standards can be found through IEST, the Secretariat of ISO/TC209.
Data Centers
What is Federal Standard 209e for Data Centers?
The outmoded (replaced by ISO 14644) benchmark for optimum and safe operating levels is compared to Federal
Standard 209e for Data Centers at 100,000 particles at .5 microns per cubic foot
of air space. Optimum levels for temperature should normally be 70 to 72 degrees
Fahrenheit, with humidity levels at 50%.
Please note: equipment manufacturers
have varying optimum operating levels.
Notice:
Federal Standard 209E has been replaced with ISO
Standard 14644. The first subsection in ISO 14644 (ISO STND. 14644-1)
has some unique changes from the old Federal Standard - however they are
very similar. This standard is now in effect for critical environments
(Cleanrooms, Data Centers, etc.) worldwide. Some companies have been
successful with the federal Standard 209E, and may not have switched
over yet. It is important for these companies to know the main
differences are easy to implement and may not be a costly change.
The main differences between Federal Standard 209E and ISO 14644-1 (Testing Standards) are:
- ISO Establishes 0.1um as the "Standard" Diameter
- ISO Creates 3 New Cleanliness Classes-
- 2 "Cleaner" classes (ISO class 1 and ISO class 2) than Federal Standard 209E
- 1 "Dirtier" Class (ISO Class 9) which is allows more particulate than Fed Standard 209E class 100,000
- Allows for discarding of "Outliers" - Federal Standard 209E did not.
International Standards for Cleanrooms and Critical Environments
International Cleanroom
Standards:
ISO/TC209 has proposed ten (10) documents which will make up
the cleanroom standards. These documents are in their final voting stages
and can be legally used in trade. The tables and sections below outline the first seven of these documents in order.
ISO-14644-1 Classification of Air Cleanliness
Cleanliness class designations and quantity have changed from FS209E (see
Table 1). Along with the obvious change to metric measure of air volume, ISO
14644-1 adds three additional classes.
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(Table 1) Airborne Particulate Cleanliness
Classes (same as table above)
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| Class |
Number of Particles per Cubic Meter
by Micrometer Size |
| 0.1 um |
0.2 um |
0.3 um |
0.5 um |
1 um |
5 um |
| ISO 1 |
10 |
2 |
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| ISO 2 |
100 |
24 |
10 |
4 |
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| ISO 3 |
1,000 |
237 |
102 |
35 |
8 |
|
| ISO 4 |
10,000 |
2,370 |
1,020 |
352 |
83 |
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| 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 |
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352,000 |
83,200 |
2,930 |
| ISO 8 |
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3,520,000 |
832,000 |
29,300 |
| ISO 9 |
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35,200,000 |
8,320,000 |
293,000 |
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(Table 2) Comparing FED STD 209E to the new ISO 14644-1.
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Airborne Particulate Cleanliness Class
Comparison
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ISO 14644-1 |
FED STD 209E
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| 1 |
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| 2 |
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| 3 |
1 |
M1.5 |
| 4 |
10 |
M2.5 |
| 5 |
100 |
M3.5 |
| 6 |
1,000 |
M4.5 |
| 7 |
10,000 |
M5.5 |
| 8 |
100,000 |
M6.5 |
| 9 |
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ISO-14644-2 Cleanroom Testing for Compliance
This document determines the type and frequency of testing required to conform
with the standard.
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Strategic Testing: (Table 1) Schedule of Tests to Demonstrate Continuing Compliance.
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| Test Parameter |
Class |
Maximum Time Interval |
Test Procedure |
| Particle Count Test |
< or = ISO 5 |
6 Months |
ISO 14644-1 Annex A |
| > ISO 5 |
12 Months |
| Air Pressure Difference |
All Classes |
12 Months |
ISO 14644-1 Annex B5 |
| Airflow |
All Classes |
12 Months |
ISO 14644-1 Annex B4 |
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Strategic Testing: (Table 2) Schedule of Additional Optional Tests.
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| Test Parameter |
Class |
Maximum Time Interval |
Test Procedure |
| Installed Filter Leakage |
All Classes |
24 Months |
ISO 14644-3 Annex B6 |
| Containment Leakage |
All Classes |
24 Months |
ISO 14644-3 Annex B4 |
| Recovery |
All Classes |
24 Months |
ISO 14644-3 Annex B13 |
| Airflow
Visualization |
All Classes |
24 Months |
ISO 14644-3 Annex B7 |
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ISO-14644-4 Cleanroom Design &
Construction
This document will be a primer on the design and construction of cleanrooms.
It will cover all aspects of the process from design development to startup and
commissioning.
ISO-14644-5 Cleanroom Operations
This document will be an introduction on cleanroom operation. It will cover all
aspects of the operation of a cleanroom including entry and exit procedures for
equipment and personnel, education and training, cleanroom apparel, and facility
issues such as maintenance, housekeeping, monitoring, system failure, etc.
ISO-14644-6 Terms, Definitions & Units
This document will provide a consistent reference for all terms, definitions
and units discussed across all ISO cleanroom standards.
ISO-14644-7 Minienvironments & Isolators
This document will focus on specialized stand-alone clean spaces including
their design, construction, and operations.
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