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ISO Cleanroom Classification Levels Explained
ISO ACH Criteria: Air Change Per Hour Standards
Achieving ISO cleanroom certification requires meeting strict Air Change Per Hour (ACH) standards. See the FS209E ACH classifications below.
| ISO 3 | 360 - 540 |
| ISO 4 | 300 - 540 |
| ISO 5 | 240 - 480 |
| ISO 6 | 150 - 240 |
| ISO 7 | 60 - 90 |
| ISO 8 | 5 - 48 |
Ensuring ISO cleanroom compliance is crucial to protect product quality and maintain safety across contamination-sensitive industries.
Why Choose Walkable Cleanroom Ceilings?
Walkable cleanroom ceilings offer a safe, contamination-free way to access HEPA/ULPA filters, sprinkler heads, and lighting fixtures from above—keeping your cleanroom pristine without internal entry.