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Q：Is the efficiency different for HEPA used in clean rooms of different cleanliness classs?
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A: Applicable efficiency of strainers for use in clean rooms of various cleanliness classs is listed in Table 5-11. However, consideration should be given to the suitability of air change frequency.
Table 5-11 Recommended efficiency of strainers
|
Cleanliness class of clean room |
HEPA strainer |
Intermediary strainer |
Primary strainer |
|
class10 ~ class 1 |
0.1μm， |
≥NBS 90% |
≥AFI 90% |
|
class 1000 ~ class 100 |
0.3μm |
≥NBS 80% |
≥AFI 80% |
|
class 10,000 |
0.3μm |
≥NBS 70% |
≥AFI 70% |
|
class 100,000 |
0.3μm |
≥NBS 70% |
≥AFI 60% |