H13 vs H14 HEPA: What's the Difference?
Under the European EN 1822 standard, H13 HEPA media must remove at least 99.95% of particles at the most penetrating particle size and H14 raises that to 99.995% — both are genuine HEPA-grade performance, but H13 is what most consumer "True HEPA" purifiers actually use, while H14 appears mostly in medical and cleanroom equipment.
The one thing to know: The European EN 1822 standard grades HEPA media by letter/number class. H13 must remove at least 99.95% of particles at the MPPS (most penetrating particle size); H14 raises that to 99.995%. Both qualify as genuine HEPA-grade performance — H13 is the class most consumer 'True HEPA' purifiers actually use, while H14 (near-surgical-grade) shows up mostly in medical or cleanroom equipment, rarely in consumer units.
The classes, side by side
| Label | Standard | Minimum capture | Where you'll see it |
|---|---|---|---|
| True HEPA | US DOE/IEST | 99.97% at 0.3 microns | Most reputable consumer purifiers |
| H13 | EN 1822 | 99.95% at MPPS | Consumer "True HEPA" units, in practice |
| H14 | EN 1822 | 99.995% at MPPS | Medical / cleanroom equipment |
| "HEPA-type" | None | No requirement | Marketing copy — treat as unverified |
Note the two standards grade at different points: the US benchmark tests at a fixed 0.3 microns, while EN 1822 grades at the most penetrating particle size — the hardest particle for that specific media to catch. That's why the percentages aren't directly comparable digit-for-digit; both describe verified, certified filtration.
Which should you actually buy?
For a home, the honest answer is that the class jump matters less than sizing. A correctly sized H13 or True HEPA unit — enough Smoke CADR for the room under the AHAM 2/3 rule — delivers the air changes that decide results. What you should avoid is the unregulated label: if a listing says only "HEPA-type" or "HEPA-like," the efficiency claim is unverified (full explainer here). When comparing, you can browse purifiers that list an H13 True HEPA class on Amazon and check each spec sheet for the exact wording.
This page reports filtration-standard facts (EN 1822 classes and the US True HEPA benchmark), not health-outcome claims.
Frequently Asked Questions
H13 is the class most consumer 'True HEPA' purifiers actually use — it must remove at least 99.95% of particles at the most penetrating particle size under the European EN 1822 standard. 'Medical grade' itself is a marketing phrase; the verifiable claims are the EN 1822 class (H13/H14) or the US 'True HEPA' standard (99.97% at 0.3 microns).
H14 (at least 99.995% at MPPS) is near-surgical-grade media that shows up mostly in medical and cleanroom equipment, rarely in consumer units. For a home room, sizing — enough Smoke CADR for the square footage — moves the result far more than stepping from H13 to H14 media.
They're two different standards describing genuine HEPA-grade performance. 'True HEPA' is the US DOE/IEST benchmark: at least 99.97% removal at 0.3 microns. H13 and H14 are EN 1822 classes graded at the most penetrating particle size. A spec sheet listing either a True HEPA claim or an H13/H14 class is making a verifiable filtration claim.
Those are unregulated marketing phrases with no efficiency requirement behind them at all — a filter can carry the label while capturing far less than certified HEPA media. If the spec sheet doesn't say 'True HEPA' or list an H13/H14 class, treat the claim as unverified.