Table 1
Schedule of testing to demonstrate compliance with particle concentration limits (ISO 14644-2).
| Classification | Maximum time interval | Test method |
|---|---|---|
≤ ISO Class 5 |
6 months |
Annex B in ISO 14644-1:1999 |
≥ ISO Class 5 |
12 months |
Annex B in ISO 14644-1:1999 |
Notes
Particle counts will normally be performed in the operational state, but may also be performed in the at-rest state in accordance with the designated ISO classification.
Table 2
Schedule of additional tests for all classes (ISO 14644-2).
| Test Parameter | Maximum time interval | Test procedure |
|---|---|---|
Airflow volume1 or airflow velocity |
12 months |
ISO 14644-3:- clause B.4 |
Air pressure difference2 |
12 months |
ISO 14644-3:- clause B.5 |
Notes
These tests may normally be performed in either the operational state or the at-rest state in accordance with the designated ISO classification.
1 Airflow volume may be determined by either velocity or volume measurement techniques.
2 This test will not apply to clean zones which are not totally enclosed.
Table 3
Schedule of optional tests (ISO 14644-2).
| Test Parameter | Class | Suggested maxmimum time interval | Test procedure |
|---|---|---|---|
Installed filter leakage |
All classes |
24 months |
ISO 14644-3:- clause B.6 |
Airflow visualisation |
All classes |
24 months |
ISO 14644-3:- clause B.7 |
Recovery |
All classes |
24 months |
ISO 14644-3:- clause B.13 |
Containment leakage |
All classes |
24 months |
ISO 14644-3:- clause B.14 |
