True HEPA vs "HEPA-type": what's the difference?
In one line: "True HEPA" meets the certified standard (H13 captures ≥99.95% at 0.3µm). "HEPA-type", "HEPA-like" or "99% HEPA" are marketing terms for filters that resemble HEPA but aren't certified — and can let noticeably more through.
Why the wording matters
"HEPA" is a defined performance standard (see HEPA H13/H14). But the word isn't tightly policed in marketing, so manufacturers pair it with qualifiers to imply HEPA performance without meeting it. The qualifier is the tell:
| Label | What it usually means |
|---|---|
| True HEPA / H13 / H14 | Meets the certified standard — ≥99.95% (H13) at the hardest size. |
| HEPA-type / HEPA-like / HEPA-style | Resembles HEPA; not certified — often ~99% or less. |
| "99% HEPA" / "99.9%" | Beware the missing decimals and particle size — may not be true HEPA. |
Does the difference matter at home?
For a home, the gap between true HEPA and a decent MERV-13 filter is small — both capture the PM2.5 that matters. The real thing to avoid is a vague "HEPA-type" filter paired with a weak fan: low capture and low airflow. Either buy a genuine true-HEPA (H13) unit or a proper high-airflow MERV-13 one — and in both cases judge it on clean-air delivery, not just the label.
Next step
Compare units on real filtration and airflow (not just labels) at Best Air Purifier UK.
FAQ
Is "HEPA-type" a scam? Not exactly — it still filters, just less than certified HEPA. The issue is implying HEPA-level performance it may not deliver. Check for "True HEPA / H13".
Is MERV-13 worse than HEPA-type? No — a genuine MERV-13 captures ~90%+ of particles and usually moves far more air, so it often cleans a room better than a weak HEPA-type filter.