What is the difference between HEPA and True HEPA?

True HEPA meets the official standard: 99.97% removal of particles at 0.3 microns, tested by an independent lab. Plain 'HEPA' or 'HEPA-type' is a marketing term with no standard — those filters typically catch 80-95% of larger particles and let fine particles through. Always look for the words 'True HEPA' plus the 99.97% rating; anything else is a cheaper filter with a big marketing label.

Is HEPA-type filter good enough?

For most health purposes, no. HEPA-type filters catch the big stuff — dust, pet hair, visible lint — but the particles that matter for allergies and lungs (pollen, dander, smoke, PM2.5) are small, and HEPA-type filters let a significant fraction through. If you're buying for allergy relief or smoke, insist on True HEPA. If you just want dust reduction on a budget, HEPA-type at least does something.

How can I tell if a filter is True HEPA?

Three checks: 1) the product page or box says 'True HEPA' (not just 'HEPA' or 'HEPA-type'); 2) it lists the 99.97% at 0.3 microns efficiency; 3) ideally, it shows an AHAM verification or independent test. If a listing says 'HEPA-like,' 'HEPA-style,' or '99% HEPA' without the True HEPA wording — it's not True HEPA. When in doubt, check the manual's filter spec.

Do expensive air purifiers use better HEPA?

No — True HEPA is True HEPA. A $99 Levoit and a $549 Rabbit Air both use True HEPA at 99.97%. The price difference buys other things: quiet operation, design, sensors, carbon layers, build quality. For filtration quality itself, cheap True HEPA = expensive True HEPA. Don't pay more expecting better filtering.

Is 99.97% HEPA the same as H13 medical-grade?

Close, but not identical. H13 (medical-grade, European standard) filters 99.95% at 0.3 microns — slightly less strict than True HEPA's 99.97%. H14 filters 99.995%. For home use, the difference between 99.95% and 99.97% is negligible. 'Medical-grade' is mostly marketing at home scale; True HEPA is the standard to look for.

HEPA vs HEPA-Type vs True HEPA: Don't Get Scammed

Walk through the air purifier aisle and you’ll see “HEPA,” “HEPA-type,” “True HEPA,” “HEPA-like,” and “99% HEPA” on boxes that look identical. The prices differ wildly. The labels are doing a lot of work.

Here’s the uncomfortable truth: only one of those labels means anything — and the others exist to confuse you. Here’s how to tell them apart in 30 seconds.

🧰 Interactive Tools

🔍Purifier FinderFilters for True HEPA only→ 🔄Filter Cost CalculatorTrue HEPA replacement costs→

Editor’s note (September 2026): The Winix 5500-2 has been discontinued and remaining stock is limited. Winix’s official successor is the Winix 5510, which adds app control and uses a new filter. Read our Winix 5510 vs 5500-2 comparison before you buy either one.

The 30-Second Guide

Close-up of pleated HEPA filter media

Label	What it means	Filtration reality
True HEPA	Meets the official standard	99.97% at 0.3 microns — real
HEPA (alone)	Marketing term, no standard	Maybe good, maybe not — check specs
HEPA-type / HEPA-like	Explicitly NOT True HEPA	Catches big particles, lets fines through
99% HEPA / 99.97% effective	Vague claim without verification	Read the fine print — often HEPA-type
H13 Medical Grade	European standard	99.95% — essentially equivalent to True HEPA

The Official Standard

True HEPA has a defined meaning: 99.97% removal of particles at 0.3 microns — the hardest-to-catch particle size (smaller and larger particles are actually caught more easily). This standard comes from the original HEPA spec, and genuinely True HEPA filters are independently tested to meet it.

“HEPA-type” and “HEPA-like” exist specifically because their makers cannot legally claim True HEPA. They catch the easy stuff — dust bunnies, lint, pet hair — and let the fine particles (pollen, dander, smoke, PM2.5) flow through. If your goal is allergy relief or smoke removal, a HEPA-type unit is a desk fan with a dust net.

The Scam Patterns to Spot

“HEPA-type” in the headline, “True HEPA” nowhere — the listing is telling you it’s not True HEPA
“99% HEPA” without the 99.97%@0.3µm spec — 99% of what size? Usually big particles only
“HEPA-like” or “HEPA-style” — same as HEPA-type
Small print: “effective on particles 2.5 microns and larger” — that’s not HEPA performance; the fine stuff is 0.1-2.5 microns
No filter efficiency spec at all — if they won’t say 99.97%@0.3µm, there’s a reason

The Honest Pricing Truth

True HEPA is cheap to make. A $99 Levoit Core 300 and a $549 Rabbit Air MinusA2 both contain genuine True HEPA filters at 99.97%. The price difference buys quiet motors, design, sensors, carbon, and brand — not better filtration.

Which means:

Never pay a premium for “True HEPA” — it’s the baseline, not a luxury
Never settle for HEPA-type to save money — the savings are false economy when the unit doesn’t do the job
The filter spec check (99.97%@0.3µm) is the single most important box-check in buying

Our True HEPA Picks

Budget: Levoit Core 300 ($99). True HEPA, 130 CFM, quiet — the baseline done right at the price True HEPA should cost.

Best value: Winix 5500-2 ($199). True HEPA plus a washable carbon filter — genuinely certified, with the odor handling most budget units lack.

Premium: Rabbit Air MinusA2 ($549). True HEPA with the quietest operation we’ve tested — the premium buys silence and design, not better filtration, and that’s an honest trade.

The Bottom Line

True HEPA (99.97% @ 0.3µm) is the only label that means anything. “HEPA-type” and “HEPA-like” are polite ways of saying “not really HEPA.” Check the spec, not the label: if a listing won’t state 99.97% at 0.3 microns, it’s not True HEPA. And remember — True HEPA is the baseline, not a luxury. A $99 unit with True HEPA filters exactly as well as a $549 one; the extra money buys everything around the filter, not better filtering.