When specifying air filtration for a cleanroom project, the choice between HEPA (High Efficiency Particulate Air) and ULPA (Ultra Low Penetration Air) filters has significant cost and performance implications. Here we break down the differences.
Efficiency Comparison
| Grade | Standard | Efficiency @ MPPS |
|---|---|---|
| H13 | EN 1822 | ≥99.95% |
| H14 | EN 1822 | ≥99.995% |
| U15 | EN 1822 | ≥99.9995% |
| U16 | EN 1822 | ≥99.99995% |
| U17 | EN 1822 | ≥99.999995% |
When to Choose ULPA
ULPA filters are typically required only for ISO 3–4 (Class 1–10) cleanrooms — mainly found in advanced semiconductor fabrication and nanotechnology research. For the vast majority of pharmaceutical, biotech, and food-processing cleanrooms (ISO 5–8), H14 HEPA filters provide more than adequate performance at lower cost and lower pressure drop.
Cost Considerations
ULPA filters cost 2–3× more than equivalent HEPA filters, have 30–50% higher pressure drop (increasing energy costs), and shorter service life. Always match the filter grade to your actual cleanliness requirement — over-specifying wastes energy and budget.