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 | β₯99.95% |
| H14 | EN 1822 | β₯99.995% |
| U15 | EN 1822 | β₯99.9995% |
| U16 | EN 1822 | β₯99.99995% |
| U17 | EN 1822 | β₯99.999995% |
When to Choose ULPA
ULPA filters are typically required only for ISO 3β4 (Class 1β10) cleanrooms β mainly found in advanced semiconductor fabrication and nanotechnology research. For the vast majority of pharmaceutical, biotech, and food-processing cleanrooms (ISO 5β8), H14 HEPA filters provide more than adequate performance at lower cost and lower pressure drop.
Cost Considerations
ULPA filters cost 2β3Γ more than equivalent HEPA filters, have 30β50% higher pressure drop (increasing energy costs), and shorter service life. Always match the filter grade to your actual cleanliness requirement β over-specifying wastes energy and budget.
